Preparation of Enantiomerically Pure ?-Silylcarboxyl Derivatives by Asymmetric 1,4-Addition toN-Enoyl-sultams. Preliminary Communication
作者:Wolfgang Oppolzer、Robert J. Mills、Werner Pachinger、Thomas Stevenson
DOI:10.1002/hlca.19860690703
日期:1986.10.29
of organocopper reagents to camphor-derived, conjugated N-enoyl-sultams gave saturated and olefinic β-silylcarboxyl derivatives with high diastereodifferentiation. Nondestructive removal of the chiral auxiliary followed by oxidative Si-C bond cleavage furnished enantiomerically pure acetate-derived aldols and propionate-derived ‘anti’ -aldols (via silyl-directed α-methylation).
EtAlCl 2促进有机铜试剂向樟脑衍生的,共轭的N-烯酰基-杜鹃花中的添加,得到具有高非对映异构性的饱和和烯属的β-甲硅烷基羧基衍生物。非破坏性地除去手性助剂,然后氧化Si-C键裂解,提供了对映体纯的乙酸酯衍生的醛醇和丙酸酯类衍生的“抗”-醛醇(通过甲硅烷基定向的α-甲基化)。