γ-Regioselective reaction of metaloxysilyl-substituted allyllithium derived from allyldiphenylsilanol
作者:Koji Takaku、Hiroshi Shinokubo、Koichiro Oshima
DOI:10.1016/s0040-4039(97)01124-6
日期:1997.7
the presence of HMPA at −45°C afforded silylallyllithium 2a bearing an oxide anion on the silicon atom. The reaction of 2a with various electrophiles gave γ-products selectively in good yields. Higher regio- and stereoselectivities were achieved in the reaction of silyl-substituted allyllithium derived from potassium allylsilanolate with butyllithium.
在-45℃下在HMPA存在下用两个当量的丁基锂处理烯丙基二苯基硅烷醇(1),得到在硅原子上带有氧化阴离子的甲硅烷基烯丙基锂2a。2a与各种亲电试剂的反应以高收率选择性地产生γ-产物。在衍生自烯丙基硅烷醇钾的甲硅烷基取代的烯丙基锂与丁基锂的反应中,实现了更高的区域选择性和立体选择性。