A chiral silyl ether as auxiliary for the asymmetric nucleophilic addition to α- and β-silyloxy carbonyl compounds
作者:Michael Trzoss、Jie Shao、Stefan Bienz
DOI:10.1016/s0040-4020(02)00553-7
日期:2002.7
Chiral silicon groups, attached as protective group in proximity to a prostereogenic functionality by means of an ether linkage, can act, at least in specific cases, efficiently as stereochemical directors. The addition of Grignard reagents to α- and β-silyloxy carbonyl compounds (silyloxy is the stereogenic (Me3C)(BnOCH2)MeSiO-group) afforded the respective products with stereofacial selectivities
手性硅基团通过醚键作为保护基团,通过醚键连接在促排卵的官能团附近,至少在特定情况下,可以有效地充当立体化学导向剂。向α-和β-甲硅烷氧基羰基化合物(甲硅烷氧基为立体异构(Me 3 C)(BnOCH 2)MeSiO-基团)添加格氏试剂,得到的相应产物的立体选择性高达92%。讨论了选择性的来源及其对结构参数的依赖性。可能尚未通过辅助组的结构优化来增加所描述原理的潜力。