Sequential Reactions of Michael Addition and Peterson Condensation of 1-Silylvinyl Ketones with Grignard Reagents: Study of Stereoselectivity
作者:Junji Tanaka、Hiroshi Kobayashi、Shuji Kanemasa、Otohiko Tsuge
DOI:10.1246/bcsj.62.1193
日期:1989.4.15
1-Silylvinyl ketones undergo smooth Michael addition with Grignard reagents generating magnesium enolates which are then trapped with benzaldehyde to give E- and Z-isomers of enones after Peterson condensation. (E)-Olefins become major products under a thermodynamic control when the condensation with benzaldehyde is carried out at room temperature in diethyl ether, while Z-isomers are more favored
1-甲硅烷基乙烯基酮与格氏试剂进行平滑的迈克尔加成,生成烯醇镁,然后在彼得森缩合后用苯甲醛捕获烯酮的 E- 和 Z-异构体。当与苯甲醛在室温下在乙醚中缩合时,(E)-烯烃成为热力学控制下的主要产物,而 Z-异构体在-78°C 的 THF 中作为动力学控制的产物更受欢迎。简要讨论了反应机理。