Favorskii-Type Rearrangement of α,α′-Dihalo Ketones with Sodiomalonates Leading to Conjugated Enone Derivatives
作者:Takashi Sakai、Mutsumi Ishikawa、Eiichiro Amano、Masanori Utaka、Akira Takeda
DOI:10.1246/bcsj.60.2295
日期:1987.6
A new synthetic method of conjugated enones by the use of carbanion-induced Favorskii-type rearrangement is described. The reaction of α,α′-dihalo ketones R1R2(X)CC(O)CH2X with sodiomalonates Na+ −CR3(CO2R4)2 in THF at 0°C—room temperature gave conjugated enones R1R2C=CHC(O)CR3(CO2R4)2 in 42–66% yields. The reaction can be also adaptable to the enolates of ethyl cyanoacetate or malononitrile to give
描述了一种使用碳负离子诱导的 Favorskii 型重排合成共轭烯酮的新方法。α,α'-二卤代酮 R1R2(X)CC(O)CH2X 与钠丙二酸酯 Na+ -CR3(CO2R4)2 在 THF 中在 0°C 下反应 - 室温得到共轭烯酮 R1R2C=CHC(O)CR3(CO2R4) 2 的 42-66% 的产量。该反应也可适用于氰乙酸乙酯或丙二腈的烯醇化物以得到相应的烯酮。