Divergent Reactivity of Rhodium(I) Carbenes Derived from Indole Annulations
作者:Xiaoxun Li、Hui Li、Wangze Song、Po‐Sen Tseng、Lingyan Liu、Ilia A. Guzei、Weiping Tang
DOI:10.1002/anie.201505329
日期:2015.10.26
carbenes were generated from propargylic alcohol derivatives as the result of a dehydrative indole annulation. Depending on the choice of the electron‐withdrawing group on the aniline nitrogen nucleophile, either a cyclopropanation product or dimerization product was obtained chemoselectively. Intramolecular hydroamidation occurred for the same type of propargylic alcohol derivatives when other transition‐metal
readily available enol nucleophiles by copper-catalyzed tandem annulation/enol nucleophilic addition has been developed. Compared to the expensive metal catalysts such as platinum, gold, silver, and palladium used previously, the most economical copper(I) catalyst could achieve this reaction efficiently. The fused heterocyclic compounds, pyrrolo[1,2-a] indoles, could be afforded by further transformation
已经开发了通过铜催化的串联环化/烯醇亲核加成从炔丙醇和容易获得的烯醇亲核体中获得各种多取代的吲哚的方法。与以前使用的昂贵的金属催化剂(例如铂,金,银和钯)相比,最经济的铜(I)催化剂可以有效地实现该反应。可以通过进一步转化产物来提供稠合的杂环化合物吡咯并[1,2- a ]吲哚。烯丙基阳离子中间体可能与该机理有关。