Asymmetric aldol reaction between achiral silyl enol ethers and achiral aldehydes by use of a chiral promoter system
作者:Shu Kobayashi、Hiromi Uchiro、Yuko Fujishita、Isamu Shiina、Teruaki Mukaiyama
DOI:10.1021/ja00011a030
日期:1991.5
In the presence of a chiral promoter consisting of tin(II) triflate, a chiral diamine, and tributylin fluoride, the silyl enol ether of S-ethyl ethanethioate or S-tert-butyl ethanetioate reacts with aldehydes to afford the corresponding aldol-type adducts in good yields with high enantioselectivities. In the reaction of silyl enol ether of S-ethyl propanethioate with aldehydes, perfect stereochemical
在由三氟甲磺酸锡 (II)、手性二胺和氟化三丁锡组成的手性促进剂存在下,乙硫酸 S-乙基或乙硫酸 S-叔丁酯的甲硅烷基烯醇醚与醛反应得到相应的醛醇型加合物产率高,对映选择性高。在硫代丙酸乙酯的甲硅烷基烯醇醚与醛的反应中,通过三氟甲磺酸锡 (II)、手性二胺和二乙酸二丁酯的组合使用,实现了完美的立体化学控制。多种醛,包括脂肪醛、α,β-不饱和醛和芳香醛,都适用于该反应。手性促进剂的特征在于 119 Sn NMR 光谱,并证明形成了三组分配合物,其行为类似于手性路易斯酸。