A regiodefined synthesis of α-trimethylsilyl ketones catalyzed by rhodium(I) hydride complex
作者:Susumu Sato、Isamu Matsuda、Yusuke Izumi
DOI:10.1016/0022-328x(88)80214-6
日期:1988.4
Regiodefined synthesis of α-trimethylsilyl ketones is attained by one of three different routes: isomerization of β-trimethylsilyl allyl alcohols (route A), isomerization of β′-trimethylsilyl allyl alcohols (route B), and dehydrogenation of β-trimethylsilyl alcohols via transfer hydrogenation to α,β-enones (route C). All of these procedures are catalyzed efficiently by HRh(PPh3)4 at about 100 °C. Route
通过以下三种途径之一实现区域定义的α-三甲基硅烷基酮的合成:β-三甲基硅烷基烯丙醇的异构化(途径A),β'-三甲基硅烷基烯丙醇的异构化(途径B)和β-三甲基硅烷基醇通过转移脱氢氢化成α,β-烯酮(路线C)。所有这些步骤均在大约100°C下被HRh(PPh 3)4有效地催化。路线A不可避免地需要存在2-三甲基甲硅烷基-1-苯基-2-丙烯-1-酮作为平滑异构化的助催化剂。这有力地表明,一种分子间转移氢化在催化循环中起着重要的作用。