Asymmetric alkylation of oxindoles: an approach to the total synthesis of (-)-physostigmine
作者:Thomas B. K. Lee、George S. K. Wong
DOI:10.1021/jo00002a074
日期:1991.1
Facile Preparation of (3S)-1,3-Dimethyl-3-cyanomethyl-5-ethoxyoxindole from Julian's Nitrile Enriched in the (3S)-Enantiomer
作者:Xue-Feng Pei、Arnold Brossi
DOI:10.3987/com-95-7256
日期:——
(3S)-1,3-Dimethyl-3-cyanomethyl-5-ethoxyoxindole (4a) was prepared in high optical purity from a 4a enriched enantiomeric mixture obtained by asymmetric 3-cyanomethylation of oxindole (11) by removal of the racemate with a single recrystallization.