Reactions of bis(trimethylsilyl)bromomethyllithium and tris(trimethylsilyl)methyllithium. the synthesis of α-bromovinylsilanes
作者:Dietmar Seyferth、James L. Lefferts、Robert L. Lambert
DOI:10.1016/s0022-328x(00)91814-x
日期:1977.12
Bis(trimethylsilyl)bromomethyllithium, (Me3Si)2CBrLi, reacts with aldehydes to give α-bromovinyltrimethylsilanes, Me3SiCBrCHR (both isomers), but with alkyl ketones only proton abstraction from the enolic form of the ketone occurs. The reaction of this lithium reagent with benzophenone gives the oxirane, (Me3Si)2.α-Bromovinylsilanes of type Me3SiCBrCR2 can he prepared by reaction of R2CCBrLi (prepared
双(三甲基硅烷基)bromomethyllithium,(ME 3 Si)的2 CBrLi,与醛反应,得到α-bromovinyltrimethylsilanes中,Me 3 SiCBrCHR(两种异构体),但与烷基酮只有质子抽象从该酮的烯醇形式发生。此锂试剂与二苯甲酮的反应,得到环氧乙烷,(ME 3 Si)的2个型的Me.α-Bromovinylsilanes 3 SiCBrCR 2可以他准备由R的反应2 CCBrLi(由正丁基锂的作用制备,或更好,叔丁基锂,R上2 CCBr 2)三甲基氯硅烷与。(Me 3 Si)3的制备描述了通过(Me 3 Si)3 CBr与正丁基锂或锂砂反应的CLi ,以及该试剂的各种反应。