Catalytic, Asymmetric Mannich-Type Reactions of α-Imino Esters Bearing Readily Removable Substituents on Nitrogen
作者:Yoshitaka Nakamura、Ryosuke Matsubara、Hiroshi Kiyohara、Shū Kobayashi
DOI:10.1021/ol034717d
日期:2003.7.1
[reaction: see text] Catalytic, enantioselective Mannich-type reactions of alpha-imino esters bearing readily removable substituents on nitrogen are described. Several N-carbamate-protected alpha-imino esters, which are readily prepared from 2-bromoglycine esters using a polymer-supported amine, reacted with silicon enolates to afford the desired adducts in high yields with high enantioselectivity
[反应:见正文]描述了在氮上带有易于除去的取代基的α-亚氨基酯的催化,对映选择性曼尼希型反应。几种由N-氨基甲酸酯保护的α-亚氨基酯易于使用聚合物负载的胺从2-溴甘氨酸酯制备,并与烯醇硅反应,以高收率使用铜(II)-二胺以高对映选择性提供所需的加合物。复杂的。还已经证明了产物胺容易脱保护并转化为游离的α-氨基酸衍生物。