Inter-and intramolecular reactions of epoxides and aziridines with π-nucleophiles

SH Krake, SC Bergmeier - Tetrahedron, 2010 - Elsevier
The synthesis and reactions of epoxides and aziridines has been regularly reviewed. 1 e6
The most typical reaction of both heterocyclic systems is the ring-opening reaction in which a …

Efficient synthesis of 3, 3′-mixed bisindoles via lewis acid catalyzed reaction of spiro-epoxyoxindoles and indoles

S Hajra, S Maity, R Maity - Organic letters, 2015 - ACS Publications
An efficient strategy for the synthesis of 3-(3-indolyl)-oxindole-3-methanol has been
developed to achieve a Lewis acid catalyzed, highly regioselective ring opening of spiro …

Synthesis of Chiral Spiro-Aziridine Oxindoles via Aza-Corey–Chaykovsky Reaction of Isatin Derived N-tert-Butanesulfinyl Ketimines

S Hajra, SM Aziz, B Jana, P Mahish, D Das - Organic letters, 2016 - ACS Publications
A general and direct strategy for the synthesis of chiral spiro-aziridine oxindoles has been
developed via an aza-Corey–Chaykovsky reaction of isatin-derived N-tert-butanesulfinyl …

Catalyst-free “on-water” regio-and stereospecific ring-opening of spiroaziridine oxindole: enantiopure synthesis of unsymmetrical 3, 3′-bisindoles

S Hajra, S Singha Roy, SM Aziz, D Das - Organic letters, 2017 - ACS Publications
A catalyst-free water-mediated regio-and stereospecific ring-opening reaction of nonracemic
spiroaziridine oxindoles and indoles has been developed with retention of configuration …

Regioselective Friedel–Crafts Reaction of Electron‐Rich Benzenoid Arenes and Spiroepoxyoxindole at the Spiro‐Centre: Efficient Synthesis of Benzofuroindolines …

S Hajra, S Maity, S Roy - Advanced Synthesis & Catalysis, 2016 - Wiley Online Library
Metal triflate‐catalysed intermolecular Friedel–Crafts reactions involving electron‐rich
benzenoid arenes and spiroepoxyoxindoles at the spiro‐centre have been developed for …

Catalyst-free ring opening of spiroaziridine oxindoles by heteronucleophiles: An approach to the synthesis of enantiopure 3-substituted oxindoles

S Hajra, S Singha Roy, A Biswas… - The Journal of Organic …, 2018 - ACS Publications
A simple catalyst-free method was developed for the ring opening of spiroaziridine
oxindoles by three different nucleophiles, namely, amines, thiols, and methanol, to produce …

Catalytic Enantioselective Aziridoarylation of Aryl Cinnamyl Ethers toward Synthesis of trans-3-Amino-4-arylchromans

S Hajra, D Sinha - The Journal of Organic Chemistry, 2011 - ACS Publications
Catalytic enantioselective one-pot aziridoarylation reaction of aryl cinnamyl ethers has been
demonstrated in detail. Combination of suitable copper catalyst and chiral bis-oxazoline …

[PDF][PDF] A catalytic and enantioselective synthesis of trans-2-amino-1-aryltetralins

S Hajra, B Maji, D Mal - Advanced Synthesis & Catalysis, 2009 - academia.edu
The bis-oxazoline-copper complex-catalyzed aziridination of alkenes followed by an
intramolecular Friedel–Crafts alkylation of the tethered and in situ generated aziridine …

Catalytic asymmetric aminolactonization of 1, 2-disubstituted alkenoic acid esters: Efficient construction of aminolactones with an all-carbon quaternary stereo-centre

S Hajra, SMS Akhtar, SM Aziz - Chemical Communications, 2014 - pubs.rsc.org
Chiral BOX–Cu (OTf) 2 catalyzed enantioselective aminolactonization of the tert-butyl ester
of alkenoic acids has been developed via in situ aziridination using PhINNs as the nitrene …

Catalytic enantioselective synthesis of A-86929, a dopamine D1 agonist

S Hajra, S Bar - Chemical Communications, 2011 - pubs.rsc.org
Catalytic enantioselective synthesis of A-86929, a dopamine D1 agonist - Chemical
Communications (RSC Publishing) DOI:10.1039/C1CC10263J Royal Society of Chemistry View …