Stereospecific formation of optically active trialkylsilyllithiums and their configurational stability
作者:Masakatsu Omote、Tetsushi Tokita、Yasutaka Shimizu、Ichiro Imae、Eiji Shirakawa、Yusuke Kawakami
DOI:10.1016/s0022-328x(00)00294-1
日期:2000.10
Optically active trialkylsilyllithiums, (R)-(n-butyl)methylphenylsilyllithium (63% ee) and (S)-methyl(1-naphthyl)phenylsilyllithium (96% ee), were prepared by cleavage of the siliconsilicon bond of (R)-1-(n-butyl)-1-methyl-1-phenyl-2,2-diphenyl-2-methyldisilane with lithium metal, or the silicontin bond of (S)-methyl(1-naphthyl)phenylsilyltrimethylstannane with methyllithium, respectively. Optical
光学活性trialkylsilyllithiums,(- [R )- (Ñ丁基)methylphenylsilyllithium(63%ee)和(小号) -甲基(1-萘基)phenylsilyllithium(96%EE)中,通过的siliconsilicon键的裂解(制备ř)-1-(正丁基)-1-甲基-1-苯基-2,2-二苯基-2-甲基二硅烷与锂金属或(S)-甲基(1-萘基)苯基甲硅烷基三甲基锡烷与分别为甲基锂。水解后,通过光学活性固定相上的HPLC,将甲硅烷基锂的光学纯度评价为相应的硅烷。发现甲硅烷基锂的形成具有高度立体定向性(分别为> 94,> 99%的保留率)。(S)-甲基(1-萘基)苯基甲硅烷基锂在-78°C下的四氢呋喃中构型稳定至少1小时。