The palladium-catalyzed reaction of neutral, slightly electron-rich and slightly electron-poor aryl iodides with methyl cinnamate in a molten n-Bu4NOAc/n-Bu4NBr 2:1.5 mixture provides a highly stereoselective route to (E)-3,3-diarylacrylates. Phosphine-free Pd(OAc)2 is employed as precursor of Pd(0) species. The reaction of a variety of methyl 3-arylacrylates with phenyl iodide under the same reaction conditions affords stereoselectively the corresponding (Z)-isomers. The catalyst system can be recycled several times.
钯催化的反应中,中性、略微富电子和略微缺电子的芳基
碘化物与
肉桂酸甲酯在熔融的n-Bu4NOAc/n-Bu4NBr 2:1.5混合物中反应,提供了一条高立体选择性的合成(E)-3,3-二芳基
丙烯酸酯的路线。采用不含膦的Pd(OAc)2作为Pd(0)物种的前体。各种
肉桂酸甲酯与苯
碘化物在相同反应条件下反应,可以立体选择性地得到相应的(Z)-异构体。该催化剂体系可以循环使用多次。