Concerning the 1,5-stereocontrol in tin(iv) chloride promoted reactions of 4- and 5-alkoxyalk-2-enylstannanes: trapping intermediate allyltin trichlorides using phenyllithium
作者:Lindsay A. Hobson、Eric J. Thomas
DOI:10.1039/c2ob25765c
日期:——
riphenyl)stannane 9 generated an allyltin trichloride that reacted with aldehydes to give the (Z)-1,5-syn-6-benzyloxy-5-methylhex-3-en-1-ols 23 and was trapped by phenyllithium to give syn-5-benzyloxy-4-methylpent-1-en-3-yl(triphenyl)stannane 24. Similar stereoselectivity was observed for tin(IV) chloride promoted reactions of this syn-5-benzyloxy-4-methylpent-1-en-3-yl(triphenyl)stannane 24 with aldehydes
5-苄氧基-4-甲基戊-2-烯-1-基(三丁基)的金属转移-和- (三苯基)锡烷1和8使用氯化锡(IV)生成三氯化烯丙基锡,其与醛反应生成(Z)-1,5-抗-6-苄氧基-5-甲基己基-3-烯-1-醇2。这烯丙基三氯化锡 被认为是这些反应的关键中间体已被 苯基锂 给 抗-5-苄氧基-4-甲基戊-1-烯-3-基(三苯基)锡烷 9。该抗-5-苄氧基-4-甲基戊-1-烯-3-基(三苯基)锡烷9的金属转移生成烯丙基三氯化物,该三氯化烯丙基与醛反应生成(Z)-1,5-顺-6-苄氧基- 5-methylhex-3-en-1-ols 23被捕获苯基锂 给 顺-5-苄氧基-4-甲基戊-1-烯-3-基(三苯基)锡烷 24。观察到类似的立体选择性氯化锡(IV)此的促进的反应顺-5-苄氧基-4-甲基戊-1-烯-3-基(三苯基)锡烷24与醛类和用苯基锂。类似地,通过4-羟基-和4-苄氧基-戊-2-烯基(三苯基)锡烷