Kinetic Resolution of Acyclic Secondary Allylic Silyl Ethers Catalyzed by Chiral Ketones
作者:Dan Yang、Guan-Sheng Jiao、Yiu-Chung Yip、Tsz-Hin Lai、Man-Kin Wong
DOI:10.1021/jo010068c
日期:2001.6.1
Kinetic resolution of acyclic secondary allylic silyl ethers by chiral dioxiranes generated in situ from chiral ketones (R)-1 and (R)-2 and Oxone was investigated. An efficient and catalytic method has been developed for kinetic resolution of those substrates with a CCl(3), tert-butyl, or CF(3) group at the alpha-position. In particular, high selectivities (S up to 100) were observed for kinetic resolutions
研究了由手性酮(R)-1和(R)-2和Oxone原位生成的手性二恶英酮对无环仲烯丙基甲硅烷基醚的动力学拆分。已经开发出一种有效的催化方法来动力学拆分那些在α位置具有CCl(3),叔丁基或CF(3)基团的底物。特别地,对于酮(R)-2催化的外消旋α-三氯甲基烯丙基甲硅烷基醚7和9-15的动力学拆分,观察到高选择性(S高达100)。回收的底物和所得的环氧化物均以高对映体过量获得。根据手性二恶英和外消旋底物之间的空间和静电相互作用,