Synthesis of 1-Substituted 1,2-Bis(trimethylsilyl)ethenes via Hydroboration of 1,2-Bis(trimethylsilyl)ethyne with Dialkylborane
作者:Masayuki Hoshi、Yuzuru Masuda、Akira Arase
DOI:10.1246/bcsj.66.914
日期:1993.3
2-bis(trimethylsilyl)ethenyl]dialkylborane. In situ treatment of the above alkenylborane with iodine in the presence of aqueous sodium hydroxide provides highly pure (E)-1-alkyl-1,2-bis(trimethylsilyl)ethene whose alkyl group migrates from the boron atom. Successive treatment of [(Z)-1,2-bis(trimethylsilyl)ethenyl]dicyclohexylborane with copper(I) iodide, allyl bromide, and aqueous sodium hydroxide affords
1,2-双(三甲基甲硅烷基)乙炔与化学计量量的二烷基硼烷的反应进行到单硼氢化反应阶段,得到[(Z)-1,2-双(三甲基甲硅烷基)乙烯基]二烷基硼烷。在氢氧化钠水溶液的存在下用碘原位处理上述烯基硼烷提供高纯度的(E)-1-烷基-1,2-双(三甲基甲硅烷基)乙烯,其烷基从硼原子迁移。[(Z)-1,2-双(三甲基甲硅烷基)乙烯基]二环己基硼烷用碘化铜(I)、烯丙基溴和氢氧化钠水溶液连续处理得到交叉偶联产物(Z)-1,2-双(三甲基甲硅烷基)-1,4-戊二烯,立体选择性。与 1-溴-1-己炔的类似交叉偶联反应,然后是紫外线照射,立体选择性地提供 (E)-1,2-双(三甲基甲硅烷基)-1-辛烯-3-炔。