[reaction: see text] 2-Iodo-4-(phenylchalcogenyl)-1-butenes 3 and 4, which are derived from methylenecyclopropanes 1, can be enynylated with alkynes catalyzed by Pd(OAc)(2) to give conjugated dienynes 5 and 6 in the absence of any phosphine ligand and copper salt, and trienyne 9a can be obtained by oxidation of compound 5a. A plausible reaction mechanism has been proposed.
[反应:请参见文本]衍生自
亚甲基环丙烷1的2-
碘-4-(苯基
硫氰酸基)-1-
丁烯3和4可以与Pd(OAc)(2)催化的
炔烃进行烯化,得到共轭二烯5和在不存在任何
膦配体和
铜盐的情况下,化合物6a和
三烯炔9a可以通过化合物5a的氧化而获得。已经提出了合理的反应机理。