Nickel(0)-katalysierte bildung von carbocyclischen amiden aus α,ω-dienen und phenylisocyanat
作者:Elisa Hernandez、Heinz Hoberg
DOI:10.1016/0022-328x(87)80256-5
日期:1987.7
Phenyl isocyanate reacts readily with 1,5-hexadiene and a (ligand)nickel(0) system forming two regioisomeric azanickela-five ring complexes by CC-coupling at −10°C. On warming, subsequent reactions eventually yield five-membered carbocyclic amides by intramolecular cyclisation. It has been found that by using a special experimental procedure - continuous slow addition of the isocyanate to a solution
异氰酸苯基酯与1,5-己二烯和(配体)镍(0)系统容易反应,通过在-10°C下CC偶联形成两个区域异构的氮杂尼克-五环配合物。在变暖时,随后的反应最终通过分子内环化产生五元碳环酰胺。已经发现,通过使用特殊的实验程序-将异氰酸酯连续缓慢地添加到含有二烯和镍(0)配合物的溶液中-该反应可以催化进行。通过这种方法,1,6-庚二烯同时生成碳环酰胺和无环酰胺。提出并详细讨论了催化循环。