Studies on retro-[1,4] Brook rearrangement of 3-silyl allyloxysilanes. Observation of the formation of unusual 3,3-bissilyl enols
作者:Zubao Gan、Ya Wu、Lu Gao、Xianwei Sun、Jian Lei、Zhenlei Song、Linjie Li
DOI:10.1016/j.tet.2012.06.005
日期:2012.8
Detailed investigations of the retro-[1,4] Brook rearrangement of 3-silyl allyloxysilanes are described. Based on control experiments and NMR studies, rationalizations are proposed for the formation of 3,3-bissilyl enols, unusual compounds that are stable to acidic hydrolysis but that can be transformed into the corresponding aldehydes under basic hydrolysis conditions. These studies further show that
描述了3-甲硅烷基烯丙氧基硅烷的逆[1,4] Brook重排的详细研究。基于对照实验和NMR研究,提出了形成3,3-双甲硅烷基烯醇的合理化方法,3,3-双甲硅烷基烯醇是对酸性水解稳定但可以在碱性水解条件下转化为相应醛的特殊化合物。这些研究进一步表明3,3-双甲硅烷基烯醇酸酯可以被烷基卤化物以完全的化学选择性进行O-烷基化。该反应为各种3,3-双甲硅烷基醛和烯醇衍生物提供了实用的入口。为了证明此方法的合成效用,已将3,3-双甲硅烷基醛转化为双甲硅烷基二乙烯基酮,该酮可经历SiO 2促进了Nazarov反应,可平稳地生成环状β-甲硅烷基烯酮。