Chemistry of Silylketenes: Simple Preparation of Silylallenes by the Reaction of Silylketenes with Phosphorus Ylides.
作者:Yasuyuki KITA、Yasunori TSUZUKI、Shinji KITAGAKI、Shuji AKAI
DOI:10.1248/cpb.42.233
日期:——
Reaction of silylketenes 1a, b with stabilized ylides 2a-e readily gave silylallenes 3a-f in high yields. However, similar reaction of 1a with the less stable ylides 2f, g resulted in low yields of the allenes 3 g, h. Use of silylketenes 5a, c with an additional trimethylsilyl group overcame this problem to give silylallenes 3c, g-k directly in considerable to good yields. In this reaction, the additional trimethylsilyl group apparently worked as a masking group.
甲硅烷基乙烯酮1a、b与稳定的叶立德2a-e的反应容易地以高产率得到甲硅烷基丙二烯3a-f。然而,1a 与稳定性较差的叶立德 2f、g 的类似反应导致丙二烯 3 g、h 的产率较低。使用具有附加三甲基甲硅烷基的甲硅烷基烯酮5a、c克服了该问题,以相当高的收率直接得到甲硅烷基丙二烯3c、g-k。在该反应中,额外的三甲基甲硅烷基显然起到了掩蔽基团的作用。