Cobalt-Catalysed [6+2] Cycloaddition of Internal Alkynes and Terminal Alkenes with Cycloheptatriene
作者:Gerhard Hilt、Anna Paul、Christoph Hengst
DOI:10.1055/s-0029-1216900
日期:2009.10
cobalt-catalysed [6+2] cycloaddition of cycloheptatriene with internal alkynes as well as with terminal alkenes is described. The cycloaddition process is most efficiently catalysed by cobalt dibromide[bis(triisopropylphosphite)] complexes in dichloromethane as the solvent of choice. In the cobalt-catalysed reaction of cycloheptatriene with norbornene an unexpected tricyclic [2+2] cycloaddition product was
描述了钴与内部炔烃以及末端烯烃的环庚三烯的[6 + 2]环加成反应。环加成过程最有效地是由二氯甲烷中的二溴化钴[双(亚磷酸三异丙酯)]络合物作为选择的溶剂来催化的。在钴催化的环庚三烯与降冰片烯的反应中,分离出出乎意料的三环[2 + 2]环加成产物,收率很高。 炔烃-烯烃-钴-环加成反应-二烯