Gold(I)-Catalyzed Intermolecular Addition of Carbon Nucleophiles to 1,5- and 1,6-Enynes
作者:Catelijne H. M. Amijs、Verónica López-Carrillo、Mihai Raducan、Patricia Pérez-Galán、Catalina Ferrer、Antonio M. Echavarren
DOI:10.1021/jo8014769
日期:2008.10.3
Gold(I)-catalyzed addition of carbon nucleophiles to 1,6-enynes gives two different type of products by reaction at the cyclopropane or at the carbene carbons of the intermediate cyclopropyl gold carbenes. The 5-exo-dig cyclization is followed by most 1,6-enynes, although those bearing internal alkynes and alkenes react by the 6-endo-dig pathway. The cyclopropane versus carbene site-selectivity can
金(I)催化的碳亲核试剂加成到1,6-炔烃中,可通过在中间体环丙基金卡宾的环丙烷或卡宾碳上反应生成两种不同类型的产物。尽管大多数带有内部炔烃和烯烃的烯烃通过6-endo-dig途径反应,但5-exo-dig环化之后是大多数1,6-enynes。在某些情况下,可以通过金催化剂上的配体控制环丙烷对卡宾的位选择性。除了富电子的芳烃和杂芳烃之外,烯丙基硅烷和1,3-二羰基化合物也可以用作亲核试剂。在1,5-烯炔与碳亲核试剂的反应中,优选5-endo-dig途径。