Regioselective Reaction of Dilithiated 1-Alkynylsilanol with Electrophiles
作者:S. Uehira、K. Takaku、H. Shinokubo、K. Oshima
DOI:10.1055/s-1998-1898
日期:1998.10
Treatment of 1-propynylsilanol 1a with two equivalents of tert-butyllithium in THF in the presence of HMPA at -78 °C afforded silylpropynyllithium 2a bearing an anionic oxygen on the silicon atom. The reaction of 2a with various electrophiles gave acetylenic adducts in good yields. Higher regioselectivities were achieved in the reaction of silyl-substituted propynyllithium derived from potassium silanolate.
在 HMPA 的存在下,在 -78 °C 的四氢呋喃中用两当量的叔丁基锂处理 1-丙炔基硅醇 1a,可得到硅原子上带有一个阴离子氧的硅丙炔基锂 2a。2a 与各种亲电体反应生成乙炔基加合物,产率良好。在与硅烷醇酸钾衍生的硅烷取代的丙炔锂反应中,获得了更高的区域选择性。