The asymmetric synthesis of α-amino and α-hydrazino acid derivatives via the stereoselective amination of chiral enolates with azodicarboxylate esters
作者:David A. Evans、Thomas C. Britton、Roberta L. Dorow、Joseph F. Dellaria
DOI:10.1016/s0040-4020(01)86058-0
日期:1988.1
(+)NH2 and (+)NH-NH2 synthons in highly diastereoselective reactions with chiral carboximide-derived enolates has been demonstrated. The lithium enolates derived from 4-substituted N-acyl 2-oxazolidinones were found to react with di-tert-butyl azodicarboxylate (DBAD) to afford the derived 2-hydrazido carboxylic acidderivatives in yields in excess of 90%. The diastereoselectivities of these reactions