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Featured researches published by Swaraj B. Maiti.


Tetrahedron Letters | 1989

Conformational and steric requirements of the side chain for sulphur participation in benzthiepin derivatives

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

Carbanion addition to acetylenes : An efficient stereoselective route to α-methylene-γ-lactams

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

Role of remote heteroatoms and nature of the reducing agents on the stereochemical course of reductions of the carbon–nitrogen π-bond of a new class of tetrahydropyridines

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

Lewis Acid-Promoted Favorskii-Type Ring Contraction of Some Cyclic α-Bromo Ketones and Their Acetals

Swaraj B. Maiti; S. R. Ray Chaudhuri; Amareshwar Chatterjee


Indian Journal of Chemistry Section B-organic Chemistry Including Medicinal Chemistry | 2002

InCl3 mediated reactions of aldehydes with allyltrimethylsilane

Rina Ghosh; Arijit Chakraborty; Debasish De; Swaraj B. Maiti


ChemInform | 2010

Photooxidation of a β-Ketoester.

Swaraj B. Maiti; Murari M. Saha; N. R. Ghosh


Archive | 2002

Rapid Communication InCl 3 - an efficient Lewis acid catalyst for stereoselective O-glycosidation reactions

Rina Ghosh; Dilip K. Maiti; Swaraj B. Maiti


Indian Journal of Chemistry Section B-organic Chemistry Including Medicinal Chemistry | 2002

InCl 3 -an efficient Lewis acid catalyst for stereoselective O -glycosidation reactions

Rina Ghosh; Arijit Chakraborty; Dilip K. Maiti; Swaraj B. Maiti


ChemInform | 2002

ChemInform Abstract: InCl3-Mediated Reactions of Aldehydes with Allyltrimethylsilane.

Rina Ghosh; Arijit Chakraborty; Debasish De; Swaraj B. Maiti


ChemInform | 1990

Synthesis of Condensed Heterocyclic Systems Using 2-Vinylbenzo(b)thiophene in Diels-Alder Reaction.

A. Ghosh; Swaraj B. Maiti; Amareshwar Chatterjee; S. R. Raychaudhuri

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Ajit K. Chakravarty

Indian Institute of Chemical Biology

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