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The one pot asymmetric synthesis of 3,3′-pyrrolidonyl spiroxindoles via a regio- and stereoselective domino reaction†
Saumen Hajra,Suhas Shivajirao Bhosale,Atanu Hazra,Nikhil Kanaujia
Organic & Biomolecular Chemistry Pub Date : 08/07/2019 00:00:00 , DOI:10.1039/C9OB01570A
Abstract

A highly efficient regio- and stereoselective domino aziridine ring opening and lactamization reaction between aziridines and 3-carboxy oxindole esters has been developed for the one pot asymmetric synthesis of 4-aryl-3,3′-spiropyrrolidonyl oxindoles with excellent selectivity (dr >99 : 1 and ee up to >99%). It was further extended to a sequential one pot protocol for the asymmetric synthesis of NH-free 3,3′-pyrrolidonyl spiroxindole, maintaining the same selectivity.

Graphical abstract: The one pot asymmetric synthesis of 3,3′-pyrrolidonyl spiroxindoles via a regio- and stereoselective domino reaction
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