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 acid derivatives in yields in excess of 90%. The diastereoselectivities of these reactions
已证明偶氮二羧酸酯作为(+)NH 2和(+)NH-NH 2合成子在与手性羧酰亚胺衍生的烯醇酸酯的高度非对映选择性反应中的用途。发现衍生自4-取代的N-酰基2-恶唑烷酮的烯醇锂与偶氮二羧酸二叔丁酯(DBAD)反应,以超过90%的产率提供衍生的2-肼基羧酸衍生物。这些反应的非对映选择性为97%至大于99%。描述了这些加合物随后以超过99%的对映体纯度转化为α-肼基和α-氨基酸。