cis-Enediyne systems bearing two non-terminal alkyne functionalities were transformed in the presence of a gold catalyst. A selective 6-endo-dig-cyclization generates mono-aurated phenyl cation intermediates, high energy species that are able to activate even primary sp3-C–H-bonds. Via insertion into intramolecularly offered, unactivated C–H-bonds, penta-substituted benzene derivatives are obtained
在
金催化剂的存在下,转化具有两个非末端
炔烃官能团的顺式-烯二炔体系。选择性的6-内切-挖掘-环化反应生成单配位的苯基阳离子中间体,这是一种高能物质,甚至可以激活初级
SP 3 -C-H键。通过插入分子内提供的未活化的C–H键,可得到最终取代的五取代苯衍
生物。在大多数情况下选择性插入到γ-
SP 3所提供的系绳-C-H键中观察到。