The reaction of allenes with active methynes and methylenes proceeded smoothly in the presence of Pd(PPh3)4/PhCOOH combined catalyst to give the corresponding monoallylated products with E-stereoselectivity in good to high yields. This result is in marked contrast to the previous finding that the reaction of allenes with active methynes, in the presence of Pd2(dba)3·CHCl3/dppb catalyst, affords the allylation products in lower yield with lower stereoselectivities.
在Pd(PPh3)4/PhCOOH联合催化剂的存在下,烯炔与活性烯烃和亚烯的反应顺利进行,生成相应的单烯基化产物,具有E-立体选择性,产率良好到高。这一结果与之前的发现形成鲜明对比,即在Pd2(dba)3·
CHCl3/dppb催化剂的存在下,烯炔与活性烯烃的反应所得到的烯基化产物产率较低且立体选择性较差。