Noncovalent Organocatalysis: A Powerful Tool for the Nucleophilic Epoxidation of α-Ylideneoxindoles
作者:Chiara Palumbo、Giuseppe Mazzeo、Andrea Mazziotta、Augusto Gambacorta、M. Antonietta Loreto、Antonella Migliorini、Stefano Superchi、Daniela Tofani、Tecla Gasperi
DOI:10.1021/ol202646w
日期:2011.12.2
A novel asymmetric nucleophilic epoxidation for alpha-ylideneoxindole esters has been successfully devised, resulting in enantioenriched spiro compounds with two new contiguous stereocenters. The employed (S)-alpha,alpha-diphenylprolinol functions as a bifunctional catalyst, creating a complex H-bond network in conjunction with a substrate and an oxidant.