Efficient activation of 2-Iminomethylpyridine/Cobalt-Based alkyne [2+2+2}cycloaddition catalyst by addition of a silver salt

被引:56
作者
Goswami, Avijit [1 ]
Itoa, Taichi [1 ]
Okamoto, Sentaro [1 ]
机构
[1] Kanagawa Univ, Dept Mat & Life Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan
关键词
catalytic cycloaddition; cobalt; iminomethylpyridine; silver triflate; substituted benzenes;
D O I
10.1002/adsc.200700188
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The addition of silver triflate (AgOTf) or silver hexafluoroantimonate (AgSbF6) significantly increased the activity of the 2-(arylimino)methyl-pyridine/cobalt(II) chloride hexahydrate (COCl2 center dot 6H(2)O)/zinc catalyst in alkyne cyclotrimerizations thereby accelerating the reaction and enabling the use of unactivated, simple internal alkynes as the monoyne substrate: The rate of reaction was found to be highly dependent on the nature of the counter anion (X-) and the ligand (L) in the postulated cationic cobalt(I) complex [LCo(l)]X-+(-).
引用
收藏
页码:2368 / 2374
页数:7
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