Swaraj B. Maiti
Jadavpur University
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Publication
Featured researches published by Swaraj B. Maiti.
Tetrahedron Letters | 1989
Ranjan Patra; Rina Ghosh; Swaraj B. Maiti; Amareshwar Chatterjee
Abstract Attempted ring expansion of some benzthiepin derivatives resulted in the formation of benzthiophens such as (3a,b) and (3d,e). A probable mechanism for this transformation has been presented.
Tetrahedron Letters | 1991
Ranjan Patra; Swaraj B. Maiti; Amareshwar Chatterjee; Ajit K. Chakravarty
Abstract Intramolecular addition of carbanions, derived from the acetylenic amides (5b,d) , (7) and (9) has been shown to be highly stereoselective leading to the α-methylene-γ-lactam derivatives (6a,b) , (8a,b) and (10) .
Journal of The Chemical Society-perkin Transactions 1 | 1988
Swaraj B. Maiti; S. R. Raychaudhuri; Amareshwar Chatterjee; Ajit K. Chakravarty
Total syntheses of the tetrahydropyridine derivatives (3a–f) and the steroid analogue (1b) are reported. Catalytic reductions of the above imines have been found to be highly stereoselective, yielding only the trans-amine in most cases. Lithium aluminium hydride reductions of the above imines (3a–e), (1b), and (3f–g), however, showed cis-stereoselectivity; the imines (3a–b) and (1b) afforded only the cis-amines under these conditions. Sodium borohydride reductions of the imines (3a–g) gave conflicting results, the imines (3a–b) and (3f–g) furnishing stereoselectively the trans-amines. Metal–ammonia reductions of the imines (3a–b) and (3f), having a carbocyclic B ring, gave a stereoisomeric mixture of amines; similar reduction of the imines (3c–d) with an oxygen atom in ring B, provided, interestingly, the corresponding trans-amines as the predominant product (84–94%). Reasons for the different stereochemical results observed in the reductions of the imines (3a–g) with various reducing agents have been briefly discussed. The stereochemical assignments of the amines (14)–(15) and (16)–(17) were secured from their 1H and 13C n.m.r. spectra, and also from 1H n.m.r. spectra of their N-acetyl derivatives.
Synthesis | 1987
Swaraj B. Maiti; S. R. Ray Chaudhuri; Amareshwar Chatterjee
Indian Journal of Chemistry Section B-organic Chemistry Including Medicinal Chemistry | 2002
Rina Ghosh; Arijit Chakraborty; Debasish De; Swaraj B. Maiti
ChemInform | 2010
Swaraj B. Maiti; Murari M. Saha; N. R. Ghosh
Archive | 2002
Rina Ghosh; Dilip K. Maiti; Swaraj B. Maiti
Indian Journal of Chemistry Section B-organic Chemistry Including Medicinal Chemistry | 2002
Rina Ghosh; Arijit Chakraborty; Dilip K. Maiti; Swaraj B. Maiti
ChemInform | 2002
Rina Ghosh; Arijit Chakraborty; Debasish De; Swaraj B. Maiti
ChemInform | 1990
A. Ghosh; Swaraj B. Maiti; Amareshwar Chatterjee; S. R. Raychaudhuri