Kalyani University :: Faculty Members

Regioselective synthesis of prntacyclic heterocycles by the thermal and Lewis acis-catalyzed Claisen rearrangement.
K. C. Majumdar*, A. K. Pal
J. Sulfur Chem. 2008, (accepted).
Synthesis of five- and six-membered heterocyclic compounds by the application of ring closing metathesis reactions.
K. C. Majumdar, S. Muhuri, R. Islam and Buddhadeb Chattopadhyay
Heterocycles, 2008 (Accepted).
Synthesis and characterization of unsymmetrical five-ring achiral banana-shapped compounds with B2 phase.
K. C. Majumdar*, S. Chakravorty and N. Pal
Mol. Cryst. Liq. Cryst. 2008, (Accepted).
Palladium-catalyzed intramolecular biaryl coupling: A highly efficient avenue for benzannulated pyranoquinolines and julolidine derivatives.
K. C. Majumdar*, A. Taher and P. Debnath
Synthesis 2008, (Accepted)
Concise strategy for the synthesis of eleven- and ansa-bridged thirteen-membered lactone macrolides by ring closing metathesis reaction.
K. C. Majumdar*, Buddhadeb Chattopadhyay and I. Ansary
Can. J. Chem. 2008, in press.
Wittig olefination and thiol-mediated 7-endo-trig radical cyclization: novel synthesis of oxepin derivatives.
K. C. Majumdar*, and A. Taher
Tetrahedron Lett. 2008, in press.
A short route to [1,2,3]triazolyl coumarin and quinolone derivatives by Cu(I)-catalyzed 1,3-dipolar cycloaddition and fluorescence studies.
K. C. Majumdar*, and S. Mondal
Lett. Org. Chem. 2008, (Accepted).
Synthesis 2008, 3857-3863.
Synthesis and thermal behaviour of chiral oligomers derived from chleosterol.
K. C. Majumdar*, S. Chakravorty, N. Pal and N. V. S. Rao
Tetrahedron 2008, in press.
An expedient palladium-mediated intramolecular cyclization route to the stnthesis of bis-fused benzofuran and a two-directional ring closing metathesis for the synthesis of bis-oxepin and bis-benzoxocine.
K. C. Majumdar*, Buddhadeb Chattopadhyay and S. Chakravorty
Synthesis 2008, in press.
Palladium-mediated Heck reaction to the synthesis of 3-substituted indoles and indolones frameworks.
K. C. Majumdar, S. Chakravorty, P. K. Shyam and A. Taher
Synthesis 2008, (Accepted).
A short route to the synthesis of pyrrolocoumarin and pyrroloquinolone derivatives by the Sonogashira cross-coupling and gold-catalyzed cycloisomerization of acetylenic amines.
K. C. Majumdar, Buddhadeb Chattopadhyay and S. Samanta
Synthesis 2008, (in press)
Formation of five- and six-membered heterocyclic compounds by radical cyclization.
K. C. Majumdar, P. Basu and Arsenio
Curr. Org. Chem. 2008, (Acepted).
Regioselective Unusual Formation of Spirocyclic 4-{3’-Benzo(2’,3’-dihydro)furo}-9-methyl-2,3,9-trihydrothiopyrano[2,3-b]indole by Acid-Catalyzed Reaction of Enol Ethers.
K. C. Majumdar, S. Alam and Buddhadeb Chattopadhyay
J. Het. Chem. 2008, (in press)
Novel synthesis of Oxothiocine derivatives by the Witting olefination and intramolecular Heck reaction via an 8-endo cyclization.
K. C. Majumdar, Buddhadeb Chattopadhayay and B. Sinha
Synthesis 2008, 3857-3863.
Regioselective synthesis of 1,8-naphtharidinone-annulated oxygen and sulphur heterocycles by tri-n-butyltin hydride-mediated radical cyclization.
K. C. Majumdar and R. Islam
Synth. Commun. 2008, (in press).
Synthesis of cyclic sulphonamide via Pd-catalyzed cross-coupling reaction: An expedient approach to polycyclic sultams.
K. C. Majumdar, S. Mondal and N. De
Synlett 2008, 2851-2855.
Regioselective synthesis of heterocyclic scaffolds by aryl radical cyclization.
K. C. Majumdar* and N. Kundu
J. Het. Chem. 2008, 45, 1039.
A convenient synthesis of pyrrolopyridines and 2-substituted indoles by gold-catalyzed cycloisomerization.
K. C. Majumdar, S. Samanta and Buddhadeb Chattopadhyay
Tetrahedron Lett. 2008, 49, 7213-7216.
A new type of symmetrical banna-shaped material based on N-methyldiphenylamine as a core moiety exhibiting an Ad to A2 transition.
K. C. Majumdar, Buddhadeb Chattopadhyay, S. Chakravorty, N. Pal and R. K. Sinha
Tetrahedron Lett. 2008, 49, 7149-7152.
Radical-mediated cyclization: Regioselective synthesis of pyrimidine- and coumarin-annulated [6,6]-fused oxygen heterocycles.
K. C. Majumdar, P. Debnath and P. K. Maji
Can. J. Chem. 2008, 86, 846-854.
Synthesis of benzoacine derivatives by thiophenol-mediated radical cyclization via 8-endo-trig mode of cyclization
K. C. Majumdar*, K. Ray, P. Debnath and P. K. Maji
Tetrahedron Lett. 2008, 49, 5597-5600.
New variation of the aromatic ortho-Claisen Rearrangement: Synthesis of fused thiophenes and pyrroles
K. C. Majumdar
Synlett Account 2008, 2400-2411.
Formation of Carbo- and heterocycles by thiol-mediated radical cyclizations.
K. C. Majumdar* and P. Debnath
Tetrahedron Report No 848, 64, 2008, 9799-9820.
New Efficient RCM-mediated Synthesis of Pyrrolidine Derivatives.
K. C. Majumdar*, S. Chakraborty and A. Taher
Synth.Commun. 2008, 38, 3159-3169.
Regioselective Synthesis of Indole-annulated Sulfur Heterocycles by Tri-n-butyltin hydride Mediated Aryl Radical Cyclization
K. C. Majumdar, P. Debnath, S. Alam and R. Islam
J. Sufur Chem. 2008, 29, 467-474.
Regioselective synthesis of pyrano[3,2-c]pyrimidine derivatives via a palladium-catalyzed unusual [1,3] aryloxy shift and cycloisomerization: first report of a [1,3] shift of an aryloxy group.
K. C. Majumdar, B. Sinha, Buddhadeb Chattopadhyay and K. Ray
Tetrahedron Lett. 2008, 49, 4405-4408.
Palladium-mediated bis- and tris-biaryl Heck coupling for the synthesis of heterocycles
K. C. Majumdar*, S. Chokravorty and N. De
Tetrahedron Lett. 2008, 49, 3419-3422.
Palladium-mediated direct synthesis of N-substituted 4-methyl and 4-ethyl isoquinolone derivatives
K. C. Majumdar*, S. Chokravorty and K. Roy
Synthesis 2008, 2991.
Regioselective Synthesis of Coumarin and Quinolone-Annulated Linearly Fused Heterocycles by the Intramolecular Heck Reaction of the Biaryl Systems.
K. C. Majumdar, Buddhadeb Chattopadhyay and A. K. Pal
Lett. Org. Chem. 2008, 5, 276-281.
Aryl radical cyclization: Regioselective synthesis of 6a, 7, 8, 12b-tetrahydro-6H- chromeno[3,4-c]quinolin-6-one.
K. C. Majumdar, P. Debnath and S. K. Chattopadhyay
Synth. Commun. 2008, 38, 1768-1777.
Regioselective Synthesis of Bioactive Heterocycles by Radical Cyclization
K. C. Majumdar
J. Indian Chem. Soc. Endowment Lecture, 2008, 85, 347-364.
Novel Synthesis of Nine-membered Oxa-Heterocycles by Pd(0)-Catalyzed Intramolecular Heck Reaction Via Unusual 9-Endo-trig Mode Cyclization.
K. C. Majumdar* and Buddhadeb Chattopadhyay
Synlett 2008, 979-982.
A new strategy for the synthesis of coumarin- and quinolone-annulated pyrroles via Pd(0)-mediated cross coupling followed by Cu(I)-catalyzed heteroannulation.
K. C. Majumdar* and Shovan Mondal.
Tetrahedron Lett. 2008, 49, 2418-2420
Sequential Thermal and Catalyzed Claisen rearrangements Towards the Synthesis of Thiocoumarin-annulated Furopyrans
K. C. Majumdar, P. K. Maji and A. K. Pal.
Lett. Org. Chem. 2008, 5, 218-223.
Intramolecular cyclization reaction: Palladium(0)-catalyzed Cyclization is more effective than tin hydride mediated reaction
K. C. Majumdar, P. Debnath, A. Taher and A. K. Pal
Can J Chem 2008, 86, 325-332.
Synthesis of Oxepin and Oxocin Annulated-Quinoline Heterocycles by Ring-closing Methatesis.
K. C. Majumdar, P. Debnath and A. Taher.
Lett. Org. Chem. 2008, 5, 169-173.
Studies in amino-Claisen and oxy-Claisen rearrangement of aryl propargyl ether moiety vs. vinyl propargylamine moiety: Regioselective synthesis of pyrrolocoumarin derivatives.
K. C. Majumdar and Buddhadeb Chattopadhyay
Synthesis 2008, 921-924.
Lewis Acid Catalyzed Claisen Rearrangement: Regioselective Synthesis of Oxygen, Nitrogen and Sulfur Heterocycles.
K. C. Majumdar and A. K. Pal.
Can. J. Chem., 2008, 86, 72-78.
New Heck Coupling Strategies for the Arylation of Secondary and Tertiary amides via Palladium-Catalyzed Intramolecular Cyclization.
K. C. Majumdar, Buddhadeb Chattopadhyay and S. Nath
Tetrahedron Lett., 2008, 49, 1609-1613.
Aluminium chloride catalyzed Claisen rearrangement: Synthesis of Polyheterocycles containing oxygen, nitrogen and sulfur.
K. C. Majumdar, R. Islam and S. Alam
Synth. Commun. 2008, 38, 754-766.
Novel synthesis of oxocine derivatives by Wittig olefination and intramolecular Heck reaction via 8-endo trig mode cyclization.
K. C. Majumdar, Buddhadeb Chattopadhyay and B. Sinha
Tetrahedron Lett. 2008, 49, 1319-1322.
Catalysis of the Claisen Rearrangement
K. C. Majumdar, S. Alam and Buddhadeb Chattopadhyay
Tetrahedron Reports. No. 822, 2008, 597-643.
Three heterocyclic rings fused (5:5:5)
K. C. Majumdar and S. K. Chattopadhyay
Publisher: Elsevier, Editor: A. R. Katrisky
Comprehensive Heterocyclic Chemistry 3rd Edn. 2008, 12, 635-710.
Regioselective synthesis of 4-aryloxymethylene-2,3,5-trihydrothiopyrano [3,2-b] indoles by the thio-Claisen rearrangement of 3-(4/-aryloxybut-2-ynythio)indoles.
K. C. Majumdar, S. Alam and S. Muhuri
J. Heterocyclic Chem. 2007, 44, 1395-1399.
Competitive [3,3] Sigmatropic Rearrangement of Aryl Propargyl Ether Moiety vs Propargyl Vinyl Amine Part in 6-[N-(4/-aryloxybut-2-ynyl)N-methyl
amino]coumarins.
Krishna C. Majumdar, T. K. Das, Buddhadeb Chattopadhyay
Indian J. Chem. Sec-B, 2007, 46, 1337-1342.
Regioselective Synthesis of Polyheterocyclic Scaffolds by Sequential [3,3] Sigmatropic Rearrangements and Pyridine Hydrotribromide Mediated Heterocyclisation
K. C. Majumdar and S. Muhuri
J. Heterocyclic Chem. 2007, 44, 1109-1114.
Thiol-mediated 8-endo cyclization: An easy access to medium-sized cyclic ethers.
K. C. Majumdar, P. K. Maji, K. Ray and P. Debnath.
Tetrahedron Lett. 2007, 48, 9124–9127.
Novel synthesis of medium-sized oxa-heterocycles by palladium-catalyzed intramolecular Heck reaction.
K. C. Majumdar, Buddhadeb Chattopadhyay and K. Ray
Tetrahedron Lett. 2007, 48, 7633-7636.
Regioselective synthesis of substituted pyrrolopyridines based on Pd(II) mediated cross coupling and base induced heteroannulation
K. C. Majumdar, and S. Mondal
Tetrahedron Lett. 2007, 48, 6951-6953.
Thiol-mediated radical cyclization: regioselective formation pf indole-annulated sulfur heterocycles by tandem cyclization
K. C. Majumdar, P. Debnath, S. Alam and P. K. Maji
Tetrahedron Lett., 2007, 48, 7031-7033.
A columnar mesophase from a disc-shaped molecule derived from triphenylamine: synthesis, mesomorphic behaviour and optical properties
K. C. Majumdar, Nilasish Pal, Pradip Debnath and Nandiraju V. S. Rao
Tetrahedron Lett. 2007, 48, 6330-6333.
Thiophenol-catalyzed Claisen rearrangement and radical cyclization: formation of furo- and pyrano coumarin derivatives
K. C. Majumdar, P. Debnath and P. K. Maji
Tetrahedron Lett., 2007, 48, 5265-5268.
Highly effective regioselective method for the synthesis of substituted coumarin and quinolone annulated heterocycles using Pd(0)-catalyzed reaction
K. C. Majumdar, A. K. Pal, A. Taher and P. Debnath
Synthesis 2007, 23, 1707-1711.
New Efficient Synthesis of Pyrido[2,3-c]coumarin Derivatives by the Pd-Catalyzed Heck Cyclization.
K. C. Majumdar, Buddhadeb Chattopadhyay and A. Taher
Synthesis 2007, 23, 3647–3652.
Formation of medium-ring heterocycles by diene and enyne metathesis
Shital K. Chattopadhyay,* Swastik Karmakar, Titas Biswas, K. C. Majumdar,* H. Rahman and B. Roy
Tetrahedron reports NO. 796, 2007, 63, 3919-3952.
Fomation of five- and six-membered heterocyclic rings under radical cyclization conditions
Krishna C. Majumdar, Pradipta K. Basu, Sudip K. Chattopadhyay
Tetrahedron Reports, NO. 782, 2007, 63, 793-826.
Synthesis of Macrocyclic Compounds by Ring closing metathesis
K. C. Majumdar, B. Roy and H. Rahaman
Curr. Org. Chem. 2007, 11, 1339-1365.
Radical Mediated Cyclization Reactions Leading to Spiro and 6,6-fused Heteroycles
K. C. Majumdar, P. Debnath, A. K. Pal, S. K. Chattopadhyay and A. Biswas
Can. J. Chem. 2007, 85, 445-452.
Synthesis, Characterization and mesogenic properties of anisotropic amines.
K. C. Majumdar, N. Pal, S. Nath, S. Choudhury and N. V. S. Rao
Mol. Cryst. Liq. Cryst., 2007, 461, 37-51.
Stannic Chloride-Iodine: An efficient reagent for regioselective synthesis of furan fused heterocycles
Krishna C. Majumdar, A. Biswas and P. P. Mukhopadhyay
Synth. Commun. 2007, 37, 2881-2890.
Studies on Sequential Claisen Rearrangement: Charge-Accelerated [3,3]-Sigmatropic Rearrangement Leading to Polyheterocycles
K. C. Majumdar, D. Saha and P. Debnath
Synth. Commun. 2007, 37, 3657-3665.
Synthesis of pyrimidine-annulated heterocycles: facile sulfoxide rearrangement of 1, 3-dimethyl-5 (4-aryloxybut-2-ynylthio) pyrimidine-2,4-dione
K.C. Majumdar, P. K. Maji, A. K. Pal
Lett. Org. Chem. 2007, 4, 134-136.
Regioselective synthesis of benzofuran-annulated six-membered sulfur heterocycles by aryl radical cyclization
Krishna C. Majumdar, Buddhadeb Chattopadhyay and S. Nath
Synth. Commun. 2007, 37, 2907-2915.
Synthesis of Oxepin-annulated Quinolone Heterocycles by Ruthenium Catalyzed Enyne Bond Reorganization/ Diels-Alder Reaction
K. C. Majumdar, P. Debnath and S. Samanta
Lett. Org. Chem. 2007, 4, 309-313.
Regioselective Synthesis of Thiopyrano[3,2-c][1]benzothiopyran-5(2H)-one and Thieno[3,2-c][1]benzothiopyran-4(2H)-one
K.C. Majumdar, A. K. Pal & M. Ghosh.
Synth. Commun. 2007, 37, 1525-1534.
A Facile Regioselective synthesis of tetracyclic sulphur heterocycles by sequential thio Claisen rearrangement
K C. Majumdar, N. Pal
Lett. Org. Chem., 2007, 4, 120-122.
Regioselective Synthesis of Pentacyclic Polyheterocycles: Sequential [3,3] Sigmatropic Rearrangement of 4-(4/-aryloxybut-2/-ynyloxy)-1-phenyl-1,8-naphthyridin-2(1H)-ones
Krishna C. Majumdar and Rafique-ul-Islam
J. Heterocyclic Chem. 2007, 44, 871-875.
Chemoselective synthesis of Thieno [3,2-c][1,8]naphthyridin-4(5H)-ones
by tandem cyclization.
Krishna. C. Majumdar and Rafique-ul-Islam.
Heteroatom Chem. 2007, 18, 87-92.
Solid State Regioselective Cyclisation Initiated by the Electrophilic Attack on the Double Bond by the N-bromosuccinimide on Montmorillonite K-10 Clay Support Under Microwave Irradiation.
K. C. Majumdar, H. Rahaman and B. Roy
Synth. Commun. 2007, 37, 1477-1484.
C-C Bond formation by Radical Cyclisation: Regioselective synthesis of [6,6] pyrano pyran system.
K. C. Majumdar and M. Jana
Synth. Commun. 2007, 37, 1735-1745.
Regioselective synthesis of 2H-benzothiopyrano [3,2-c]quinolin-7 (8H)-ones by tri-n-butyltin hydride mediated radical cyclization.
K. C. Majumdar and N. Kundu
Synth. Commun., 2007, 37, 1747-1756.
Synthesis of sulphur compounds: Regioselective synthesis of thieno[2,3-b]thiophene by sulfoxide rearrangement.
K. C. Majumdar, N. Pal and S. K. Samanta
Phosphorus, Sulfur and Silicon 2007, 182, 667-675.
An Efficient route to Thieno[2,3-d]pyrimidine derivatives by tandem [2,3] and [3,3] sigmatropic rearrangement.
K. C. Majumdar, N. Pal and S. K. Chattopadhyay
Lett. Org. Chem, 3, 709-711 (2006)
Synthesis of Thiepin-annulated Pyrone and Coumarin Heterocycles by Grubbs’ Second Generation Catalyst Mediated Enyne Metathesis.
K. C. Majumdar, S. Muhuri, H. Rahaman, R. Islam, B. Roy
Chem. Lett. , 35, 1430-1431 (2006)
Regioselective synthesis of biologically interesting pentacyclic polyheterocycles by thio-Claisen and AlCl3 catalyzed oxy-Claisen rearrangement of 4-(4'-aryloxybut-2'-ynylthio)-1-phenyl-1,8-naphthyridin-2(1H)-one.
K. C. Majumdar and R. Islam
Can. J. Chem., 84, 1632-1639 (2006)
Synthesis of oxepin- and oxocin- annulated pyrimidine derivative Claisen rearrangement and ring closing metathesis / ring closing enyne metathesis.
K. C. Majumdar, P. K. Maji, H. Rahaman and B. Roy
Lett.Org. Chem. 3, 845-847 (2006).
Oxepin and spiro-annulation of 2-pyridone and coumarino via Claisen rearrangement and Ruthenium Carbene complex mediated Enyne metathesis.
K. C. Majumdar, H. Rahaman and B. Roy
Lett. Org. Chem., 3, 526-529 (2006)
Regioselective unusual formation of spirocyclic 4-{2'-benzo(2',3'-dihydro)furo}-9-methyl-2,3,9-trihydrothiopyrano[2,3-b]indole by 4-exo-trig aryl radical cyclization and rearrangement.
K. C. Majumdar and S. Alam
Org. Lett., 8, 4059-4062 (2006)
Regioselective synthesis of coumarin-annulated polyheterocycles by [3,3] sigmatropic rearrangement.
K. C. Majumdar and Buddhadeb Chattopadhyay
Synth. Commun., 36, 3125-3133 (2006).
Effect of substitution in stannic chloride mediated heterocyclization of 4-allyl-3- hydroxyquinolin-2(1H)-ones.
K. C. Majumdar and N. Kundu
Synth. Commun., 36, 3191 (2006)
Synthesis of Pyrimidine Annulated Heterocycles: An Efficient Sequential and
Tandem Catalyzed Claisen Rearrangement – intramolecular hydroaryloxylation approach to furothiopyran system.
K. C. Majumdar and S. K. Chattopadhyay,
Can. J. Chem., 84, 469-475 (2006)
Carbon-Carbon Bond Formation by Radical Cyclization: Regioselective Synthesis of Spiro Heterocyclic Compounds by nBu3SnH Mediated Reaction
K. C. Majumdar and N. Kundu
Synth. Commun., 36, 1879-1886 (2006)
Regioselective Synthesis of Pyrone-annulated Sulfur Heterocycles by Aryl Radical Cyclization
K. C. Majumdar and S. Muhuri
Synthesis, 2725-2730 (2006)
Sequential [3,3] Sigmatropic Rearrangement: Regioselective Synthesis of Dimedone-Annulated Heterocycles
K. C. Majumdar and S. K. Samanta
Synth. Commun., 36, 1299-1306 (2006)
Studies on Amineoxide Rearrangement: Synthesis of pyrrolo[3,2-c][1]benzothiopyran-4-one
K. C. Majumdar S. K. Chattopadhyay and P. P. Mukhopadhyay
Synth. Commun., 36, 1291-1297 (2006)
Tandem Claisen rearrangement and Ruthenium catalyzed Enyne bond reorganization as a route to the synthesis of Tricyclic 1,8-Naphthyridiones.
K. C. Majumdar, H. Rahman, R. Islam and B. Roy,
Tetrahedron Lett., 47, 2111-2113 (2006)
Synthesis of spiro-pyridopyridine analogues by Grubb’s catalyst mediated alkene and enyne methathesis reaction.
K. C. Majumdar, R. Islam, H. Rahaman and B. Roy
Org. Biomol. Chem., 4, 2393 (2006)
Regioselective Synthesis of 7-acetyl-11c-methyl-4b,5,7,11c-tetrahydro[1]benzofuro[2/,3/:4,5]thiopyrano[2,3-b]indoles by Sequential Claisen Rearrangement of 2-(4/-aryloxybut-2/-ynylthio)-1-acetylindoles.
K. C. Majumdar and S. Alam
J. Chem. Res., 281-285 (2006)
Regioselective Synthesis of Thieno[2,3-b]Indoles by Tandem Cyclization involving Sigmatropic Rearrangements.
K. C. Majumdar and S. Alam
J. Chem. Res., 289-292 (2006)
Regioselective Synthesis of thieno[3,2-b]indole by Tandem Cyclization of 1-acetyl-3-(4-aryloxybut-2-ynylthio)indole.
K. C. Majumdar, S. Alam and S. Muhuri
Lett. Org. Chem., 3, 250-252 (2006)
Bent Shaped Liquid Crystalline Materials with furan Bridge in mesogenic Core Structure
K. C. Majumdar, N. Pal and N. V. S. Rao
Liquid Crystals, 33, 531-535 (2006)
Steroselective synthesis of Tricyclic Pyranoxepin derivatives by Ruthenium catalysed Enyne Metathesis/Diels-Alder Reaction
K. C. Majumdar, H. Rahaman, S. Muhuri, and B. Roy
Synlett., 466-468 (2006)
Synthesis of Potentially Bioactive Heterocycles: Thermal [3,3]Sigmatropic rearrangement of 4-(4/-aryloxybut-2/ynyloxy)-6-methyl-2-pyridone
K. C. Majumdar, H. Rahaman and B. Roy
Synth. Commun, 36, 809-816 (2006)
Studies on Amineoxide Rearrangement: Meisenheimer rearrangement of m-substituted tertiary amineoxide,
K. C. Majumdar, B. Roy, P. K. Basu and P. Biswas
Indian Journal of Chemistry, 45B, 719-725 (2006)
SnCl4-I2 Mediated Regioselective 6-Endo and 5-Exo Cyclization of Ortho- allylenols
K. C. Majumdar, A. Biswas and P. P. Mukhopadhyay
Can. J. Chem., 83, 2046-2051 (2005)
Regioselective synthesis of quinolone–annulated sulfur heterocycles by aryl radical cyclisation
K. C. Majumdar, P. P. Mukhopadhyay and A. Biswas
Tetrahedron Lett., 46, 6655 (2005)
Facile Regioselective Synthesis of Pyrrolo-pyrones: tandem reaction of 4-N-(4'-aryloxy-2'-ynyl), N-methyl pyran-2-one with 3-chloroperoxybenzoic acid.
K. C. Majumdar, H. Rahaman, and B. Roy
Lett. Org. Chem., 2, 739 (2005)
Formation of Five and Six Membered Heterocyclic Rings Under Radical Cyclization Conditions
Krishna C. Majumdar, Pradipta K. Basu and Partha P. Mukhopadhyay
Tetrahedron Reports, 61, 10603 (2005)
Regioselective Synthesis of Pyrimidine-Annulated Spiro Heterocycles by RadicalCyclization
K. C. Majumdar, T. K. Das and M. Jana
Synth. Commun , 35, 1961 (2005)
Regioselective Synthesis of Coumarin and Quinolone-annulated Spiro Heterocycles via Aryl Radical Cyclization
K. C. Majumdar, P. P. Mukhopadhyay and P. K. Basu,
Synth. Commun., 35, 1291 (2005)
Regioselective Synthesis of 3-(aryloxyacetyl)-2,3-dihydrothieno[3,2-c] [1]Benzo-thiopyran-4-ones: A Tandem [2,3] and [3,3]sigmatropic Rearrangement Approach
K. C. Majumdar, S. K. Chattopadhyay and M. Ghosh
Lett. Org. Chem., 2, 231 (2005)
Regioselective Synthesis of Pyrrolo[2,3-d]pyrimidine Derivatives by
Amine Oxide Rearrangement
Krishna C. Majumdar, Anindita Biswas and Partha P. Mukhopadhyay
Synthesis, 1164-1168 (2005)
Studies in thio-Claisen rearrangement: Synthesis of thieno[3,2-c]quinolone derivatives from 4-allylthioquinolin-2-(1H)-ones.
K. C. Majumdar, D. Saha, and M. Ghosh
Synth. Commun, 35, 947-954 (2005)
N-Iodosuccinimide  an effective reagent for regioselective heterocyclization of o-cyclohex-2-enylanilines for the synthesis of hexahydrocarbazoles
K. C. Majumdar, U. K. Kundu, U. Das, S. K. Samanta and N. K. Jana
Can. J. Chem., 83, 63-67 (2005)
Unusual Reduction of a Lactone Carbonyl in a Bu3SnCl and Na(CN)BH3 Mediated Radical Cyclization of 3-( o-Bromophenoxymethyl)coumarins
K. C. Majumdar and S. K. Chattopadhyay,
Tetrahedron lett. 45, 6871-6873 (2004)
Regioselective Aryl Radical Cyclization: Access to Pyrimidine-Annelated Spiro
Heterocycles Through 5-exo Ring Closure
K. C. Majumdar and P. P. Mukhopadhyay
Synthesis, 1864-1868 (2004)
Synthesis of Bioactive Heterocycles By Radical Cyclization
K. C. Majumdar and S. K. Chattopadhyay,
Proceedings of the Bangladesh Chemical Congress, 167-180 (2004)
Regioselective Synthesis of Chromeno[4,3-c]isoquinolin-11-ones by radical cyclization
K. C. Majumdar, and S. Sarkar
Synth. Commun., 34, 2873-2883 (2004)
Fomation of Five and Six Membered Heterocyclic Rings By Radical Cyclization Conditions.
Krishna C. Majumdar, Partha P. Mukhopadhyay, and Pradipta K. Basu
Heterocycles, 63, Issue 8, 1903-1958 (2004).
Fomation of Five and Six Membered Heterocyclic Rings under Radical Cyclization Conditions
Krishna C. Majumdar, Pradipta K. Basu and Partha P. Mukhopadhyay
Tetrahedron Reports number 684, 60, 6239-6278, (2004).
Regioselective Synthesis of 3-(Aryloxyacetyl)-2,3-dihydrothieno-[2,3-b]benzo-thipyran-4-ones via tandem cyclization.
K. C. Majumdar A. Bandyopadhyay and S. K. Ghosh
Synth. Commun., 34, 2159-2167 (2004).
Regioselective Synthesis of Thieno[3,2-c][1]benzopyran-4-ones by Thio-Claisen Rearrangement
Krishna C. Majumdar and Anindita Biswas
Monatsch. Chem., 135, 1001-1007 (2004).
Studies in thio-Claisen rearrangement: Regioselective synthesis of thiopyrano[2,3- b]pyran-2-one and thieno[2,3-b]pyran-2-ones
K. C. Majumdar, S. Sarkar and S. Ghosh
Synth. Commun. 34, 1265-1275 (2004).
Synthesis of Sulfur Heterocycles by Thio-Claisen Rearrangement
K. C. Majumdar and A. Bandyopadhyay
Monatsch. Chem., 135, 581-587 (2004).
Studies in Sigmatropic Rearrangement: Synthesis of 3,11a-dimethyl-6a,11a-dihydro-
1H,6H-pyrano[3/,4/:5,6]thiopyrano[4,3-b][1]benzofuran-1-one
Krishna C. Majumdar, Uday K. Kundu, Partha P.Mukhopadhyay and Subhojit Ghosh
Arkivoc. (ix), 47-57 (2003).
Studies in Thio-Claisen Rearrangement: Facile Regioselective Synthesis of
2H-thiopyrano[3,2- c]quinolin-5(6H)-ones
K. C. Majumdar and M. Ghosh
J. Indian Chem. Soc., 80, 1077-1080 (2003).
Carbon-Carbon Bond Formation by Radical Cyclization: Regioselective Synthesis of Coumarin-Annulated Sulfur Heterocycles.
K. C. Majumdar, A. Biswas and P. P. Mukhopadhyay
Synthesis, 2385-2389 (2003).
Thio-Claisen Rearrangement 1980-2001
K. C. Majumdar, S. Ghosh and M. Ghosh
Tetrahedron, 59, 7251-7271 (2003)
N-Iodosuccinimide-an Efficient Reagent for Regioselective Heterocyclization of 3-Allyl-4 hydroxy[1]benzopyran-2-ones.
K. C. Majumdar, P. K. Basu and B. Roy
Synth. Commun., 33, 3621-3630 (2003)
Studies in Pyrimidine-annulated heterocycles: Unusual formation of spiroheterocyclic compounds from acid catalyzed reaction of Enol ether
K. C. Majumdar, S. Sarkar and T. Bhattacharrya
Tetrahedron, 59, 4309-4314 (2003)
Regioselective Synthesis of Pentacyclic Heterocycles by Sequential [3,3] Sigmatropic Rearrangement of 2-(4/-Aryloxybut-2/-ynyl-mercapto)thiochromen-4-ones.
K. C. Majumdar, A. Bandyopadhyay and A. Biswas
Tetrahedron, 59, 5289-5293 (2003)
The C-C bond Formation by Radical Cyclization: Synthesis of
Pyrimidine-annulated Heterocycles
K. C. Majumdar and P. P. Mukhopadhyay
Synthesis, 920-924 (2003)
Synthesis of Thiochromen-4-one-Annulated Heterocycles: Regioselective Cyclization of 3-Hydroxy-2-cyclohex-2/-enyl thiochromen-4-one
K. C. Majumdar and B. Roy
Synth. Commun 33, 133-142 (2003)
Synthesis of Pyrimidine-Annulated Heterocycles: Regioselective Heterocyclization of 6- Cyclopent-2- enyl-5-hydroxy-1,3-dimethyl –1H-Pyrimidine-2,4-dione and 5-Cyclopent-2-enyl-6-hydroxy-1,3-dimethyl-1H-Pyrimidine-2,4-dione
K. C. Majumdar, U.K. Kundu, S. K. Samanta, and N. K. Jana
Monatsch. Chem. 134, 1137-1143 (2003)
Regioselective Synthesis of 1H,3H,6H-[2]benzopyrano[4,3-d]pyrimidine-2,4- dione and 12H - benzopyrano[3,2-c][1] benzopyran-5-ones by redical cyclization.
K. C. Majumdar, P. K. Basu, P. P. Mukhopadhyay,S. Sarkar, S. K. Ghosh and P. Biswas
Tetrahedron, 59, 12, 2151-2157 (2003)
Regioselective Synthesis of 2H-benzopyrano [3,2-c]quinolin-7(8H)-one by radical cyclization
K. C. Majumdar and P. P. Mukhopadhyay
Synthesis 97-100 (2003)
Synthesis of Dimedone-Annulated Heterocycles: Regioselective Heterocyclization of 2-(cyclohex-2/-enyl)-5,5-dimethyl-3-hydroxy cyclohex-2-enone.
K. C. Majumdar, S. K. Samanta and P. K. Basu
Synth. Commun., 33,679-686 (2003)
Formation of five and six-membered heterocyclic rings by radical cyclization.
K. C. Majumdar and P. K. Basu
Heterocycles, 57, 2413-2440 (2002)
Studies on Triacetic acid lactone-Annulated Heterocycles: Synthesis of 3-aryloxyacetyl-6-methyl-2,3-dihydrothieno[3,2-c]pyran-4-ones by Tandem Cyclization.
K. C. Majumdar, U. K. Kundu, and S. Ghosh
Tetrahedron, 58, 10309-10313 (2002)
Regioselective synthesis of heterocycles by sigmatropic rearrangement: Passage to Benzofuro [3,2- c] -6a,11a-dihydro-3,11a-dimethylthiopyranopyran-1-one
K. C. Majumdar, U. K. Kundu, and S. Ghosh
Perkin Trans 1, 2139-2140 (2002)
Tandem Cyclization: One Pot Regioselective Synthesis of Thieno[3,2-c]quinoline- 4(5H)-One Derivatives.
K. C. Majumdar and M. Ghosh
Tetrahedron, 58, 10047-52 (2002)
N-Iodosuccinimide Mediated Regioselective Heterocyclization of 3-Cyclohex-2/-enyl-4-hydroxycoumarin.
K. C. Majumdar and S. Sarkar
Tetrahedron, 58, 8501-8504 (2002)
Studies in Sigmatropic Rearrangement: Synthesis of [6,6] Pyranothiopyran Ring system by Sequential Claisen Rearrangement and Pyridine Hydrotribromide Mediated Regioselective “6- endo” cyclization
K. C. Majumdar, U. K. Kundu and S. K. Ghosh.
Org.Lett., 4, 2629-2631 (2002)
Studies on Sulfoxide Rearrangement: Synthesis of Dimedone-Annelated Heterocycles
K. C. Majumdar and S. K. Samanta
Tetrahedron 58, 4551- 4554 (2002)
Regioselective Heterocyclization of 3-(cyclohexene-2/-enyl)-4-hydroxy-6- methyl pyran-2-one
Krishna C. Majumdar and Subhojit Ghosh
Monatsch. Chem., 133, 1317-1323 (2002)
Regioselective Synthesis of Thieno[2,3-b]quinolin-4(9H)-ones: Occurrence of thermal[1,3] sigmatropic rearrangement.
K.C.Majumdar, M. Ghosh and M. Jana
Synthesis 669-673 (2002)
N-Iodosuccinimide-mediated Regioselective Cyclization of o-cyclohex-2-enyl phenols
K. C. Majumdar and P. K. Basu
Synth.commun, 32, 3719-3724 (2002)
Studies in Sulfoxide Rearrangement: Regioselective Synthesis of 3-(aryloxyacetyl)-
2,3-dihydrothieno[3,2-c][1]benzopyran-4ones
K. C. Majumdar and S. K. Ghosh
Tetrahedron Lett., 43, 2123-2125 (2002)
Studies of Bioactive Heterocycles: Facile Thio-Claisen Rearrangement of
propargyl thio[1]benzopyran-2-ones.
K. C. Majumdar and S. K. Ghosh
Tetrahedron lett., 43, 2115-2117 (2002)
Synthesis of Bioactive Heterocycles: Tandem Reaction of 4-N-(4/-Aryloxybut-2/- ynyl), N-methylaminocoumarin with 3-chloroperoxybenzoic acid
K. C. Majumdar and S. K. Samanta
Tetrahedron Lett., 43, 2119-2121 (2002)
Facile Regioselective Synthesis of 2(H)-thiopyrano[3,2-c]quinoline-5(6H)-ones by Thio-Claisen Rearrangement of Propargyl thio[1]benzopyran-2-ones
K. C. Majumdar, M. Ghosh, M. Jana. and D. Saha
Tetrahedron Lett., 43, 2111-2113 (2002)
Synthesis of Pyrimidine-Annulated Heterocycles: Regioselective Heterocyclization
of 5- (Cyclohex-2-enyl)-1,3-dimethyl-6-hydroxy uracil
K. C. Majumdar and S. K. Samanta
Monatsh.Chem. 133, 1187-1192 (2002)
Synthesis of Bioactive Heterocycles: Aza-Claisen Rearrangement of 4-N-(4'-aryloxybut-2'- ynyl),N-methylamino[1]benzothiopyran-2-ones
K. C. Majumdar and S. K. Samanta
Synthesis, 1, 121-125 (2002)
Aza-Claisen Rearrangement (Brief review)
K. C. Majumdar and Trijit Bhattacharyya
J. Indian Chem Soc, 79, 112-121 (2002)
Synthesis of Bioactive Heterocycles: Thermal [3,3] Sigmatropic Rearrangement of 4-(4'-aryloxybut-2-ynyloxy)-6-methyl-2-pyrones
K. C. Majumdar, S. Ghosh and A. K. Kundu
Synth. Commun., 32, 753 (2002)
Studies in Sigmatropic Rearrangement: Regioselective synthesis of thieno[2,3-b]thiochromen-4-one derivatives
K. C. Majumdar and S. K. Ghosh
Synth. Commun., 32(8), 1271-1274 (2002)
Studies in Sigmatropic Rearrangement: Thermal Rearrangement of 3-Prop-2'-ynyloxythia- pyran-4-ones
K. C. Majumdar and B. Roy
Synth. Commun., 32, 2985-2990 (2002)
Studies in Sigmatropic Rearrangement: Thermal Rearrangement of 3-(4/-aryloxybut-2- ynyloxy) thiochromen-4-ones
K. C. Majumdar and B. Roy
J. Chem. Res. (S), 538-539 (2001)
Regioselective Synthesis of Pyrimidine-Annulated Heterocycles from 6-(Cyclohex-2-enyl)-1,3-dimethyl-5-hydroxyuracil
K. C. Majumdar, U. Das, U. K. Kundu and A. Bandyopadhyoy
Tetrahedron 57, 7003-7007 (2001)
Synthesis of Bioactive Heterocycles: Sigmatropic Rearrangements of 6-N-(4/-aryloxybut-2/-ynyl),N-methylamino-1,3-dimethylpyrimidine-2,4-dione.
K. C. Majumdar and T. Bhattacharyya
Synthesis 1568-1572 (2001)
Studies in Aza-Claisen Rearrangement: Synthesis of Dimedone-annelated unusual heterocycles
K. C. Majumdar and S. K. Samanta
Tetrahedron, 57, 4955-4958 (2001)
Regioselective Synthesis of [4b, 12c-cis]-6a,12b-4b,5,12c,13-tetrahydropyrano[2,3-c:4,5-c/]- bis[1]benzopyran-7-one
K. C. Majumdar, P. Chatterjee, S. Saha and S. K. Samanta
Indian J. Chem., 40B, 915-918 (2001)
Professor U. R. Ghatak commemoration issue
Studies of Bioactive Heterocycles: Amino-Claisen Rearrangement of 4-N-(4-Aryloxybut-2-ynyl), N-methyl-aminocoumarins
K. C. Majumdar, T. Bhattacharyya
Tetrahedron Lett. 42, 4231-33, (2001).
Synthesis of linear heterocycles: Thermal Sigmatropic rearrangement of 4-(4-Aryloxybut-2- ynyloxy[1]benzopyran-2-thiones
K. C. Majumdar and G. H. Jana
Synthesis 924 -928 (2001)
Synthesis of Pyrimidine-Annelated Heterocycles: Thermal Rearrangement of 1,3-Dimethyl-5-(prop-2-enylthio)pyrimidine-2,4-diones
K. C. Majumdar, N. K. Jana, A. Bandyopadhyay and S. K. Ghosh
Synth. Commun., 31, 2979-2985 (2001)
Thiochromenone-Annelated Heterocycles: Regioselective Synthesis of Furo[3,2-b]thio-chromen-9-ones
K. C. Majumdar, B. Roy and P. Biswas
Monatsh.Chem. 132, 739-746 (2001)
Studies on Pyrimidines: Synthesis of Pyrimidine-Annelated Heterocycles from 5-Amino-6-Cyclohex-2-enyl-1,3-dimethyluracil
K. C. Majumdar and N. K. Jana
Monatsh.Chem. 132, 633-638 (2001)
Studies in Sigmatropic Rearrangement: Synthesis of 4-Aryloxy-methylene-1,7- dimethyl-1,2,3-trihydropyridino[3,2-c]pyran-5-ones
K. C. Majumdar and S. Ghosh
Tetrahedron, 57, 1589-1592 (2001)
Regioselective Synthesis of Pyrano[3,2-f]quinolin-2(7H)-ones and Furo[3,2- f]quinolin-2-ones
K. C. Majumdar, S. K. Ghosh and P. Biswas
Monatsh.Chem., 131, 967-973 (2000)
Cyclization of 3-Cyclopent-2-enyl-4-hydroxy[1]benzopyran-2-one
K. C. Majumdar, P. Biswas and P. K. Choudhury
Synth. Commun., 30, 4047-4056 (2000)
Studies in [3, 3] sigmatropic rearrangement: Regioselective cyclization of 5-(cyclohex-2-enyl)-6-hydroxy-1-methylquinolin-2(1H)-one
K. C. Majumdar, P. Biswas and S. K. Ghosh
Synth. Commun., 30, 4113-4128 (2000)
Synthesis of Pyrimidine-annelated Heterocycles: Regioselective Synthesis of 1,3,6-trialkyl Thieno[3,2-d]pyrimidine-2,4-diones
K. C. Majumdar and N. K. Jana
Synth. Commun., 30, 4183-4196 (2000)
Studies in Competitive [3,3] Sigmatropic Rearrangement: Synthesis of Oxygen heterocycles
K. C. Majumdar and N. K. Jana
Synth. Commun., 30, 2613-2623 (2000)
Reactions of Derivatives of 1,4-Dichlorobut-2-yne Leading to Heterocycles.
K. C. Majumdar and P. Biswas
Heterocycles, 50, 1227-1268 (1999).
Synthesis of furo[3,2-c]quinolin-4(5H)-ones
K. C. Majumdar, A. K. Kundu and P. Biswas
Heterocycles, 51, 2399-2406 (1999).
Unusual Ring Contraction of 3H-Pyrano[2,3-c]quinolin-5(6H)-ones to Furo[2,3-c]quinolin-4(5H)-ones
K. C. Majumdar, A. K. Kundu and P. Biswas
Heterocycles, 51, 471-474, (1999).
Synthesis of Bioactive Heterocycles: One Pot Regioselective Synthesis of Pyrano[3,2-f]- benzo(b)thiophene Derivatives.
K. C. Majumdar and P. Biswas
Tetrahedron, 55, 1449-1456 (1999).
Cyclisation of 3-Cyclopent-2-enyl-4-hydroxy[1]benzopyran-2-one
K. C. Majumdar, P. K. Choudhury and P. Biswas
Indian J. Chem., 37B, 1197-1201 (1998).
Studies in Pyrimidine-Annelated Heterocycles by Tandem Cyclisation: Regioselective Synthesis of [6,6]Pyranopyran by internal [1,6] Michael Addition
K. C. Majumdar and U. Das
J. Org. Chem., 63, 9997-10000 (1998).
Studies in Sulfoxide Rearrangement: Regioselective Synthesis of Thieno[3,2-f]quinolin-7(6H)- one Derivatives
K. C. Majumdar and P. Biswas
Tetrahedron, 54, 11603-11612 (1998).
Regioselective Synthesis of [6c,12b-cis]-6c,7,12,13-tetrahydro-1H-Chromeno[3=B4, 4=B4 : 4,5]pyrano[2,3-c]Chromeno-1-ones via [1, 6] Michael addition
K. C. Majumdar, P. Chatterjee and S. Saha
Tetrahedron Lett., 39, 7147-7148 (1998).
Regioselective Synthesis of Bioactive Polyheterocycles: Sequential [3, 3] Sigmatropic Rearrangements of 6-(4-Aryloxybut-2-yn-1-yloxy[1]benzopyran-2-ones
K. C. Majumdar and P. Chatterjee
Synth. Commun., 28, 3849-3863 (1998).
Synthesis of Bioactive Polyheterocycles: Regioselective Cyclisation of 5-Cyclohex-2-enyl-6-Hydroxy[1]Benzopyran-2-one
K. C. Majumdar and P. Chatterjee
Synth. Commun., 28, 3633-3644 (1998).
Regioselective synthesis of heterocycles from 3-cyclohex-2-enyl-4-hydroxy-1-methyl-quinolin-2(1H)-one
K. C. Majumdar and T. Bhattacharyya
Synth. Commun., 28, 2907-2923 (1998).
Studies on Pyrimidine-annelated Heterocycles: Synthesis of Pyrrolo[3,2-d]pyrimidines by Amine Oxide Rearrangement
K. C. Majumdar, U. Das and N. K. Jana
J. Org. Chem., 63, 3550-3553 (1998).
Synthesis of Carbazoles from o-Cyclohex-2-enylanilines
K. C. Majumdar, U. Das and A. K. Kundu
Synth. Commun., 28, 1593-1600 (1998).
Competitive Study of Meisenheimer Rearrangement in a Substrate Tertiary amine with Allylic and Propynylic Moieties
K. C. Majumdar and G. H. Jana
Can. J. Chem., 76, 297-300 (1998).
Regioselective Synthesis of 8-Aryloxymethyl-6H-pyrano[3,2-d]pyrimidine-2,4-diones
K. C. Majumdar and U. Das
Synth. Commun. 27, 4013-4019 (1997).
Studies in Sigmatropic Rearrangement of 3-(4-aryloxybut-2-ynyloxy)-1-methyl quinolin-2-ones: Synthesis of 3H-pyrano[2,3-c]quinolin-5(6H)-ones and furo[2.3-c]quinolin-4(5H)-ones.
K. C. Majumdar and A. K. Kundu
Heterocycles, 45, 1467-1475 (1997).
Studies on Amine Oxide Rearrangement: Regioselective Synthesis of Pyrrolo[3,2-f]- quinolin-7-ones
K. C. Majumdar, P. Biswas and G. H. Jana
J. Chem. Res. (M), 2068-2079 (1997).
Studies on Sigmatropic Rearrangements: Regioselective Synthesis of Coumarins, Quinolones and Thiocoumarins with 3,4-Fused Pyran or Furan Ring Systems by Claisen Rearrangement
K. C. Majumdar and U. Das
J. Indian Chem. Soc., 74, 884-890 (1997).
Professor T. R. Govindachari commemoration issue
Studies on Amine Oxide Rearrangement: Regioselective Synthesis of Pyrrolo[3,2-f]-quinolin-7-ones.
K. C. Majumdar, P. Biswas and G. H. Jana
J. Chem. Res. (S), 310-312 (1997).
Regioselective Synthesis of 6H-Pyrano[3,2-d]pyrimidine-2,4-diones and Furo[3,2-d]pyrimidine-2,4(1H)-diones
K. C. Majumdar and U. Das
J. Chem. Res. (M), 2062-2067 (1997).
Regioselective Synthesis of 6H-Pyrano[3,2-d]pyrimidine-2,4-diones and Furo[3,2-d]pyrimidine-2,4(1H)-diones
K. C. Majumdar and U. Das
J. Chem. Res. (S), 309 (1997).
Regioselective Synthesis of Furo[3,2-c][1]benzopyran-4-one and Furo[3,2-c]quinolin-4-one
K. C. Majumdar and T. Bhattacharyya
J. Chem. Res. (M), 1701-1707 (1997).
Regioselective Synthesis of Furo[3,2-c][1]benzopyran-4-one and Furo[3,2-c]quinolin-4-one
K. C. Majumdar and T. Bhattacharyya
J. Chem. Res. (S), 244-245 (1997).
Studies in Sigmatropic Rearrangement: Thermal Rearrangement of 3-(meta-substituted aryloxymethyl)coumarins
K. C. Majumdar, G. H. Jana, S. K. Ghosh and S. Saha
Monatsh. Chem., 128, 641-650 (1997).
Further rearrangement of Meisenheimer Products of Allylaryl Amine Oxides
K. C. Majumdar and G. H. Jana
J. Org. Chem., 62, 1506-1508 (1997).
A novel synthesis of 10-membered cyclic bis-ethers from 4-[N-alkylanilino]but-2-yn-1-ol
K. C. Majumdar,G. H. Jana and U. Das
J. Chem. Soc., Perkin Trans. 1, 1229-31 (1997).
Three heterocyclic rings fused (5:5:5)
K. C. Majumdar and L. N. Dutta
A chapter in Comprehensive Heterocyclic Chemistry, Vol. 8, pp 933-966 2nd edition 1996
1-Alkylisatins via Aldol-Retro-Aldol Condensation
K. C. Majumdar, A. K. Kundu and P. Chatterjee
J. Chem. Research (S), 460-461 (1996).
Regioselective Synthesis of Pyrano[3,2-f]chromen-3(7H)-ones
K. C. Majumdar and P. Chatterjee
J. Chem. Research (S), 462-463 (1996)
Regioselective Synthesis of Polyheterocycles from 4-Cyclohex-2-enyl-3-hydroxy-1-methylquinoline-2(1H)-one
K. C. Majumdar and A. K. Kundu
Synth. Commun., 26, 4023-4037 (1996).
Synthesis of 1-Alkoxy-1,2,3,4-tetrahydrocarbazoles by Mercury(II) mediated Hetero-cyclisation of 2-Cyclohex-2'-enyl-N-alkylanilines
K. C. Majumdar and U. Das
Can. J. Chem., 74, 1592-1596 (1996)
Studies in Amine Oxide Rearrangement: An unusual product from the reaction of 4-[N-alkylanilino]but-2-yn-1-ol with m-chloroperoxybenzoic acid
K. C. Majumdar, G. H. Jana and U. Das
J. Chem. Soc., Chem. Commun., 517-518 (1996)
Regioselective Synthesis of thiopyrano[2,3-b][1]benzopyran-5(2H)-one
K. C. Majumdar and G. H. Jana
Heterocycles, 43, 767-774 (1996)
Cyclisation of ortho-Cyclohexenyl Phenols via Epoxidation
K. C. Majumdar, P. Chatterjee and A. K. Kundu
Synth. Commun., 26, 3331-3344 (1996)
Hexamethylene tetramine Hydrotribromide Mediated Regioselective Cyclisation of ortho-Cyclohexenyl Phenols
K. C. Majumdar, A. K. Kundu and P. Chatterjee
Synth. Commun., 26, 893-898 (1996)
Pyridine Hydrobromide Perbromide mediated Heterocyclisation of o-Cyclohexenyl Phenols
K. C. Majumdar and A. K. Kundu
Can. J. Chem., 73, 1727-1732 (1995)
Studies in [3,3] Sigmatropic Rearrangement : Facile Regioselective Synthesis of Furo[2,3-c]quinolin-4(5H)-ones and Pyrano[2.3-c]quinolin-5(6H)-ones
K. C. Majumdar, A. K. Kundu and P. Chatterjee
J. Chem. Res. (M), 2301-2318 (1995)
Studies in Sigmatropic Rearrangements
K. C. Majumdar
J. Deptt. Chem. G. U., 1, 13-18 (1995)
Studies in [3,3] Sigmatropic Rearrangement : Facile Regioselective Synthesis of Furo-[2,3-c]quinolin-4(5H)-ones and Pyrano[2.3-c]quinolin-5(6H)-ones
K. C. Majumdar, A. K. Kundu and P. Chatterjee
J. Chem. Res. (S), 386-387 (1995)
Sequential [3,3] Sigmatropic Rearrangement of 7-(4-aryloxybut-2'-ynyloxy)[1]benzopyran-4-ones : Regioselective Synthesis of Polyheterocycles
K. C. Majumdar and S. K. Ghosh
J. Chem. Research (M), 2601-18 (1994)
Studies in Amine Oxide Rearrangement: Synthesis of Pyrano[3,2-c]indol-7-one
K. C. Majumdar and S. K. Ghosh
J. Chem. Soc. Perkin Trans. 1, 2889-2894 (1994)
Sequential [3,3] Sigmatropic Rearrangement of 7-(4-aryloxybut-2'-ynyloxy)[1]benzopyran-4-ones : Regioselective Synthesis of Polyheterocycles
K. C. Majumdar and S. K. Ghosh
J. Chem. Research (S), 462-463 (1994)
An unusual chromone formation and its rearrangement to a coumarin
K. C. Majumdar, P. K. Choudhury, M. Nethaji
Tetrahedron Lett. 35, 5927-5930 (1994)
Phase-Transfer-Catalysed Alkylative Elimination: Synthesis of 10-Enynyl acridones from Acridones and Aryloxy-4-chlorobut-2-ynes
K. C. Majumdar and S. K. Ghosh
Synth. Commun., 24, 217-231 (1994)
Studies in Sigmatropic Rearrangement: Rearrangement of 4-(4-alkylsubstituted aryloxybut-2-ynyloxy)[1]-benzopyran-2-ones
K. C. Majumdar, D. P. Das, G. H. Jana and A. T. Khan
Indian J. Chem., 33B, 120-124 (1994)
Facile Alkylative Cyclisation: Regioselectivity in the Synthesis of Thiopyrano[2,3-b][1]- benzopyran-5(4H)-one
K. C. Majumdar, S. Saha and A. T. Khan
Indian J. Chem., 33B, 216-222 (1994)
Pyridine hydrotribromide Mediated Regioselective Cyclisation of ortho-Cyclohexenyl Phenols
K. C. Majumdar and A. K. Kundu
Indian J. Chem., 32B, 605-606 (1993)
Sequential [3,3] Sigmatropic Rearrangement of 1-Aryloxy-4-(4/-coumarinyloxy)but-2-ynes.
K. C. Majumdar, D. P. Das and G. H. Jana
Synth. Commun., 23, 2171-2183 (1993)
Sigmatropic Rearrangement of 3-(aryloxymethyl)coumarins: A simple synthesis of Hydroxylated-3-benzylcoumarins
K. C. Majumdar, S. Saha, R. N. De and S. K. Ghosh
J. Chem. Soc. Perkin Trans. 1, 715-718 (1993)
Regioselective Synthesis of Flindersine Analogues
K. C. Majumdar and P. K. Choudhury
Synth. Commun., 23, 1087-1100 (1993)
Cyclisation of 4-[2-cyclopentenyl]-3-hydroxy[1]benzopyran-2-one
K. C. Majumdar and P. K. Choudhury
Synth. Commun., 22, 3013-3027 (1992)
Proton-NMR spectra of 3-substituted propynes and 1,4-bis derivatives of 2-butyne.
A. Bannerjee, P. Saha, K. C. Majumdar and P. K. Choudhury
J. Indian Chem. Soc., 69, 144-146 (1992)
Studies in cyclisation of 3-[2-cyclohexenyl]-4-hydroxy[1]benzopyran-2H-one
K. C. Majumdar, A. T. Khan, A. K. Gupta, A. K. Kundu and P. K. Choudhury
Indian J. Chem., 31B, 667-72 (1992)
Carbon-13 NMR spectra of 1-substituted Prop-2-ynes and 1,4-bis derivatives of 2-butyne
A. Banerjee, P. Saha, K. C. Majumdar and P. K. Choudhury
Magn. Reson. Chem., 30, 1145-48 (1992)
Regioselective Synthesis of 4-Aryloxymethyl thiopyrano[2,3-b]benzopyran-5(2H)-ones
K. C. Majumdar, A. T. Khan and S. Saha
Synth. Commun., 22, 901-912 (1992)
Facile Regioselective Alkylative Cyclisation : Synthesis of 2-methyl-4H-thieno[2,3-b][1]-benzothiopyran-4-one and thiopyrano[2,3-b][1]benzothiopyran-5(4H)-one
K. C. Majumdar, A. T. Khan and S. Saha
Syn. Lett., 595-596 (1991)
A Regioselective Synthesis of 2-Alkylfuro[3,2-c]quinolin-4(5H)-ones
K. C. Majumdar and P. K. Choudhury
Heterocycles, 32, 73-78 (1991)
Regioselective alkylation of 4-hydroxy[1]benzothiopyran-2(H)-thione
K. C. Majumdar, A. T. Khan and S. Saha
Indian J. Chem., 30B, 643-45 (1991)
Proton and carbon-13 NMR spectra of some 3,4-fused Pyrano Coumarins and furo Coumarins
A. Patra, S. K. Panda, K. C. Majumdar, A. T. Khan and S. Saha
Magn. Reson. Chem., 28, 631-35 (1991)
Phase transfer catalysed alkylation of 6(5H)-phenanthridinone and 6(5H)-phenanthridine-thione
K. C. Majumdar, S. K. Chattopadhyay and A. K. Gupta
Indian J. Chem., 29B, 1138-40 (1990)
Studies in [3,3] Sigmatropic Rearrangements : Rearrangement of 4-methyl-7-(p-tolyloxy-but-2-ynyloxy)[1]benzopyran-2-one
K. C. Majumdar and A. K. Gupta
Indian J. Chem., 29B, 752-56 (1990)
Studies on the cyclisation of 4-[2/-cyclohexenyl]-3-hydroxy [1] benzopyran-2-one
K. C. Majumdar, A. T. Khan, A. K. Gupta and K. Dey
Synth. Commun., 20, 1249-1263 (1990)
Studies in [3,4] Sigmatropic Rearrangements: A novel synthesis of 9-Allenyl-10-Substituted Anthracenes from 10,10-disubstituted-9-anthranols
K. C. Majumdar, A. T. Khan and S. K. Chattopadhyay
J. Chem. Soc. Perkin Trans. 1, 2219-24 (1990)
Mercury (II) mediated heterocyclisation of 2-cyclohex-2-enyl-N-methylaniline
K. C. Majumdar, R. N. De and S. Saha
Tetrahedron Lett., 1207-8 (1990)
Phase transfer catalysed alkylation 4-hydroxycoumarin - synthesis of ,-disubstituted-o-hydroxyacetophenones
K. C. Majumdar, A. T. Khan and S. K. Chattopadhyay
Indian J. Chem. 29B, 483-5 (1990)
Facile Regioselective Synthesis of Pyrano[3,2-c][1]benzothiapyran-5(2H)-one and 2- methylfuro[3,2-c][1]benzothiapyran-4-one
K. C. Majumdar, P. K. Choudhury and A. T. Khan
Synth. Commun., 19, 3249-57 (1989)
Regioselective synthesis of 1-aryloxymethyl-3H-pyrano[2,3-c]benzopyran-5(3H)-one and 1-aryloxymethyl-2-methyl furano[2,3-c]benzopyran-4H-one
K. C. Majumdar and R. N. De
J. Chem. Soc. Perkin Trans. 1, 1901-5 (1989)
Phase-Transfer-Catalysed Alkylation of 3-Hydroxycoumarin
K. C. Majumdar, A. T. Khan and S. K. Chattopadhyay Heterocycles, 29, 1573-76 (1989)
One pot synthesis of 2-Aryloxymethyl-1-cyanomethyl-5,6-dihydro-4H-pyrrolo[3,2,1-ij]-quinoline via rearrangement of N-oxide from 1-aryloxy-4-tetrahydroquinol-1-ylbut-2-yne
K. C. Majumdar, S. K. Chattopadhyay and A. T. Khan
J. Chem. Soc. Perkin Trans. 1, 1285-88 (1989)
Facile regioselective synthesis of 2-methylfurano[3,2-c][1]benzopyran-4-one and 2-methyl-furano[2,3-c][1]benzopyran-4-one
K. C. Majumdar, A. T. Khan, D. P. Das
Synth. Commun. 19, 917-930 (1989)
A Reinvestigation on the Reaction of Anthrone with Propargyl bromide
K. C. Majumdar and S. K. Chattopadhyay
Indian J. Chem. 28B, 514-15 (1989)
Synthesis of 10-alkyl-9-allenyl anthracenes involving [3,4] sigmatopric rearrangement
K. C. Majumdar, A. T. Khan and S. K. Chattopadhyay
J. Chem. Soc. Chem. Commun. 654-55 (1989)
Studies of [3,3] Sigmatropic Rearrangements: Rearrangement of 3-(4-p-Tolyloxybut-2-ynyloxy)[1]benzopyran-2-one
K. C. Majumdar, R. N. De, A. T. Khan, S. K. Chattopadhyay, K. Dey and A. Patra
J. Chem. Soc. Chem. Commun., 777-79 (1988)
Regioselective synthesis of 4-Aryloxymethyl-2H-pyrano[3,2-c]benzopyran-5H-one from 1-aryloxy-4-[4-coumarinyloxy]but-2-yne
K. C. Majumdar, D. P. Das and A. T. Khan
Synth. Commun., 18, 2027-36 (1988)
Carbon-13 NMR of 1,6-bis derivatives of 2,4-hexadiyne
K. C. Majumdar ,R. N. De, B. K. Sen, A. Banerjee and A. K. Mitra
Magn. Reson. Chem., 26, 626-28 (1988)
Regioselective synthesis of 2H-pyrano[3,2-c]benzopyran-5H-one and 3H-Pyrano[2,3-c]- benzopyran-5H-one
K. C. Majumdar, A. T. Khan and R. N. De
Synth. Commun., 18, 1589-95 (1988)
Phase-transfer-catalysed alkylation of anthrone and 10-propargyl anthrone
K. C. Majumdar, S. K. Chattopadhyay and A. T. Khan
Synthesis, 552 (1988)
Studies in amine oxide rearrangement: An unusual product from the reaction of 1-aryloxy-4-tetrahydroquinolylbut-2-yne with m-chloroperoxybenzoic acid
K. C. Majumdar and S. K. Chattopadhyay
J. Chem. Soc. Chem. Commun., 524-25 (1987)
Studies in amino Claisen rearrangement: Rearrangement of 3,6-bis-N-methylanilinocyclohexene
S. K. Chattopadhyay, R. N. De and K. C. Majumdar
Indian J. Chem., 26B, 480-81 (1987)
Fragmentation of 1,6-bis(arylsulphinyl)hexa-2,4-diynes,1-arylsulphenyl-6-arylsulphinyl-hexa- 2,4-diynes and 1-arylsulphinyl-6-arylsulphonylhexa-2,4-diynes under electron impact
B. K. Sen, S. K. Chattopadhyay, and K. C. Majumdar
J. Indian Chem. Soc., 64, 28-30 (1987)
Alkylation of Acridone and Thioacridone
S. K. Chattopadhyay, B. K. Sen and K. C. Majumdar
J. Indian Chem. Soc., 64, 313-314 (1987)
Synthesis and alkylation of bis(9-anthryl)disulphide
K. C. Majumdar, S. K. Chattopadhyay and B. K. Sen
Indian J. Chem., 25B, 1261-62 (1986)
Reaction of anthrone with propargyl bromide: A novel synthesis of 2-methyl anthra-[9,1-bc]pyran
K. C. Majumdar, B. K. Sen and S. K. Chattopadhyay
Indian J. Chem., 25B, 1024-26 (1986)
Synthesis of bicyclic oxygen heterocycles, Part II: Synthesis of 9-Aryloxy-3-bromo-2,4-ethanochromans
S. K. Chattopadhyay, B. K. Sen and K. C. Majumdar
Indian J. Chem., 25B, 56-59 (1986)
Reactions of 6,8-dioxabicyclo[3.2.1]oct-3-ene and 6,8-dioxabicyclo[3.2.1]oct-2-ene with lithium aluminium hydride
K. C. Majumdar, K. Ranganayakulu and R. K. Brown
Ind. J. Chem., 23B, 303-306 (1984)
Studies on rearrangement of 3,6-diaryloxycyclohexenes
B. K. Sen and K. C. Majumdar
Ind. J. Chem., 22B, 1184-1186 (1983)
Reactions of aryl propargyl thioether: Synthesis of some 1,6-bis derivatives of hexa-2,4-diyne
B. K. Sen and K. C. Majumdar
J. Ind. Chem. Soc., 60, 409-411 (1983)
Synthesis of the potential DNA bis intercalative agents of the phenanthridinium class
J. W. Lown, B. C. Gunn, K. C. Majumdar and E. McGoran
Can. J. Chem., 57, 2305-13 (1979)
Bis intercalative binding to DNA of novel bis(10-methyl)acridinium chlorides and its dependence on chain length of linker
J. W. Lown, B. C. Gunn, R. Y. Chang, K. C. Majumdar and J. S. Lee
Can. J. Biochem., 56, 1006-15 (1978)
Studies related to antitumor antibiotics, Part-X. Reaction of Maytansine and its analogues with DNA in vitro
J. W. Lown, K. C. Majumdar and A. I. Myres
J. Bioorg. Chem., 6, 453-463 (1977)
Strand scission of DNA by bound Adriamycin Daunorubicin in the presence of reducing agents
J. W. Lown, S. K. Sim, K. C. Majumdar and R. Y. Chang
Biochem. biophys. Res. Commun., 76, 705-710 (1977)
Studies related to antitumor antibiotics. Part IX. Reactions of Carzinophillin with DNA assayed by ethidium fluorescence
J. W. Lown and K. C. Majumdar
Can. J. Biochem., 55, 630-635 (1977)
Electron impact induced elimination. Elimination of SO vs remote group interactions in aryl allyl sulfones, 1,4-bis(arylsulfonyl)-2-butenes, 1-aryloxy-4-arylsulfonyl-2-butenes and 4-(phenylsulfonyl)methyl-2H-1-benzopyransB. S. Thyagarajan, K. C. Majumdar and D. K. Bates
Phophorus and sulfur, 1, 67-73 (1976)
Fragmentations of benzo(b)thiophenes under electron impact
B. S. Thyagarajan and K. C. Majumdar
Phosphorus and sulfur, 1, 55-66 (1976)
Mercuric ion catalysed hydration of derivatives of 1,4-dichloro-2-butynes. Hydration of 1-aryloxy-4-arylthio-2-butynes, and 1,4-bis(arylthio)-2-butynes and 1,4-bis(arylsulfonyl)-2-butynes
B. S. Thyagarajan, K. C. Majumdar and D. K. Bates
J. Heterocyclic Chem., 12, 59-66 (1975)
Synthesis of indole derivatives. Part-III. Extension of the Amine oxide rearrangement
B. S. Thyagarajan and K. C. Majumdar
J. Heterocyclic Chem., 12, 43-47 (1975)
Synthesis of hexahydro-1,3,5-tricarbethoxy-s-triazines, octahydro-1,3,5,7-tetracarbethoxy tetrazocines and their interconvertibility
K. C. Majumdar and B. S. Thyagarajan
J. Heterocyclic Chem., 11, 937-942 (1974)
New synthesis of 2,3-disubstituted indoles
J. B. Hillard, K. V. Reddy, K. C. Majumdar and B. S. Thyagarajan
J. Heterocyclic Chem., 11, 369-375 (1974)
Electron impact induced eliminations. Remote group interaction in derivatives of 1,4-bis-(arylsulfonyl)-2-butyne
B. S. Thyagarajan, D. K. Bates, K. C. Majumdar and Peter Brown
Int. J. Sulfur Chem., part-A., 8, 551-556 (1976)
A novel synthesis of indole derivatives via Claisen rearrangement
B. S. Thyagarajan, J. B. Hillard, K. V. Reddy and K. C. Majumdar
Tetrahedron Lett. 1999-2002 (1974)
Synthesis of 2-aryloxymethyl-3-aminomethylbenzo(b)thiophenes and 2,3-diaryloxymethyl-benzo(b)thiophenes
B. Elosta, K. C. Majumdar and B. S. Thyagarajan
J. Heterocyclic Chem., 10, 107-109 (1973)
Studies in Claisen rearrangement. Part-XII. Synthesis of benzofuro[3,2-c][1]-6a,11a- dihydro-11a-methylbenzopyran derivatives from 1,4-diaryloxybut-2-ynes
K. C. Majumdar, K. K. Balasubramanian and B. S. Thyagarajan
J. Heterocyclic Chem., 10, 159-164 (1973)
Synthesis of 4-methyl-3-chromenyl aryl sulfones
K. C. Majumdar and B. S. Thyagarajan
Int. J. Sulfur Chem., A, 2, 153-159 (1972)
A. new direct synthesis of methyl-3-benzothienylketones from dihydrobenzothiophenes
K. C. Majumdar and B. S. Thyagarajan
Int. J. Sulfur Chem. A, 2, 67-68 (1972)
A short synthesis of 4-aryloxymethyl-3-chromenes and 3-(-aryloxy)ethylbenzofurans
K. C. Majumdar and B. S. Thyagarajan
J. Heterocyclic Chem., 9, 489-94 (1972)
3. Studies in Claisen Rearrangements. Part XI. A novel synthesis of Benzo(b)thiophene and derivatives from aryl 2-propynyl sulphoxides
K. C. Majumdar and B. S. Thyagarajan
Int. J. Sulfur Chem. A, 2, 93-103 (1972)
Unusual Ortho-Claisen rearrangements of Aryl prop-2-ynyl sulfoxides
K. C. Majumdar and B. S. Thyagarajan
J. C. S. Chem. Commun., 83-84 (1972)
A new ring expansion of Benzofurobenzopyran into Benzofurobenzoxepinone derivatives
K. C. Majumdar and B. S. Thyagarajan
J. C. S. Chem. Commun., 1480-81 (1970).