Palladium-catalyzed diastereoselective syntheses of (E)-1-trimethylsilyl-2-alkenes, (E)-1-trimethylsilyl-1-alken-3-ynes, (1E,5E)-1-trimethylsilyl-1,5-alkadien-3-ynes, (1E,3Z)- and (1E,3E)-1-trimethylsilyl- 1,3-alkadienes
作者:Bianca Patrizia Andreini、Adriano Carpita、Renzo Rossi、Barbara Scamuzzi
DOI:10.1016/s0040-4020(01)89506-5
日期:1989.1
convenient diastereoselective procedures have been developed to prepare nearly stereoisomerically pure (E)-1-trimethylsilyl-2-alkenes (4), (E)-1-trimethylsilyl-1-alken-3-ynes (5), (1E,5E)-1-trimethylsilyl-1,5-alkadien-3-ynes (6), and (1E,3E)-1-trimethylsilyl-1,3-alkadienes (8) from stereoisomeric mixtures of alkenyl bromides. Compounds 5 have been stereoselectively converted into (1E,3Z)-1-trimethylsilyl-1
根据我们的观察结果,在相应的(Z)-立体异构体存在下,(E)-1-溴-1-烯烃优先与多种有机金属进行立体定向的Pd催化交叉偶联,从而实现了高效简便的非对映选择性程序已经开发出制备几乎立体异构纯的(E)-1-三甲基甲硅烷基-2-烯烃(4),(E)-1-三甲基甲硅烷基-1-烯烃3-炔(5),(1E,5E)-1-来自烯基溴化物的立体异构体混合物的三甲基甲硅烷基-1,5-链二烯-3-炔(6)和(1E,3E)-1-三甲基甲硅烷基-1,3-链二烯(8)。已将化合物5立体选择性地转化为(1E,3Z)-1-三甲基甲硅烷基-1,3-二烯(7)进行选择性加氢金属化,然后水解。还研究了化合物5-8的一些合成应用。