Zinc Metal-Promoted Stereoselective Olefination of Aldehydes and Ketones with<i>gem</i>-Dichloro Compounds in the Presence of Chlorotrimethylsilane
作者:Yoshio Ishino、Masatoshi Mihara、Shintaro Nishihama、Ikuzou Nishiguchi
DOI:10.1246/bcsj.71.2669
日期:1998.11
A combination of zinc metal and a catalytic amount of chlorotrimethylsilane has been found to promote the transformation of various aldehydes and ketones with gem-dichloro compounds, such as benzylidene dichloride (1a) and methyl dichloroacetate (1b), to the corresponding cross-coupling products, such as substituted styrene 3 and methyl acrylates 4 derivatives, under mild reaction conditions in THF. The E-isomer of the corresponding alkenes was obtained stereoselectively in good-to-excellent yields. The reaction serves as a very convenient one-pot procedure.
将锌金属与催化量的氯三甲基硅烷结合,已被发现能够促进各种醛和酮与gem-二氯化合物的转化,如苄叉二氯化物(1a)和二氯乙酸甲酯(1b),生成相应的交叉偶联产物,如取代苯乙烯3和甲基丙烯酸酯4衍生物,反应在四氢呋喃的温和反应条件下进行。相应烯烃的E-异构体以良好至优良的产率选择性获得。该反应作为一种非常方便的一锅法程序。