In the presence of a catalytic amount of Ni(cod)2 and PCy3, the reaction of (E)-1-phenylbut-2-en-1-one (1a) with ethylene occurred to give three-component addition products, 1,6-enone 2a and 1,5-diketone 4a. The reaction of an enone with two ethylenes gave 2a. The reaction of two enones with an ethylene gave 4a. On the other hand, 2-methyl-1-phenylprop-2-en-1-one (1b) reacted with two ethylenes selectively to give a mixture of 2b and 3b. The reaction might proceed via oxidative cyclization of an enone and an ethylene with nickel(0).
在催化量的 Ni(cod)2 和
PCy3 存在下,(E)-1-
苯基丁-2-
烯-1-
酮(1a)与
乙烯发生反应,生成三组分加成产物 1,6-
烯酮 2a 和 1,5-二
酮 4a。一个
烯酮与两个
乙烯反应生成 2a。两个
烯酮与一个
乙烯反应生成 4a。另一方面,
2-甲基-1-
苯基丙-2-
烯-1-
酮(1b)与两个
乙烯发生选择性反应,生成 2b 和 3b 的混合物。该反应可能是通过一个
烯酮和一个
乙烯与
镍(0)发生
氧化环化反应进行的。