Strictly regio-controlled method for α-alkenylation of cyclic ketones via palladium-catalyzed cross coupling
作者:Ei-ichi Negishi、Zbyslaw R. Owczarczyk、Douglas R. Swanson
DOI:10.1016/0040-4039(91)80010-4
日期:1991.1
Cyclic α-iodoenones and α-triflyloxyenones, but not α-bromoenones, smoothly react with alkenylzinc and related derivatives in the presence of a catalytic amount of a palladium-phosphine complex, such as Pd(PPh3)4 or Cl2Pd(PPh3)2 treated with n-BuLi (2 equiv), to give α-alkenylenones which can be conjugately reduced to the corresponding α-alkenyl ketones with complete retention of both enone regiochemistry
在催化量的钯-膦配合物(例如Pd(PPh 3)4或Cl 2 Pd(PPh )的存在下,环状α-碘烯和α-三氟乙酮,而不是α-溴烯,与烯基锌和相关衍生物平稳反应3)2用正丁基锂(2当量)处理,得到的α-烯基烯酮可以共轭还原为相应的α-烯基酮,同时完全保留烯酮的区域化学和烯基立体化学。