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。
Silver Acetate Catalyzed Hydroamination of 1-(2-(Sulfonylamino)phenyl)prop-2-yn-1-ols to (<i>Z</i>)<i>-</i>2-Methylene-1-sulfonylindolin-3-ols
作者:Dewi Susanti、Fujiet Koh、Jeffrey Antonius Kusuma、Prasath Kothandaraman、Philip Wai Hong Chan
DOI:10.1021/jo301198z
日期:2012.9.7
A method to prepare (Z)-2-methylene-1-sulfonylindolin-3-ols efficiently that relies on silver acetate catalyzed hydroamination of 1-(2-(sulfonylamino)phenyl)prop-2-yn-1-ols is reported. The reactions proceed rapidly at room temperature with catalyst loadings as low as 1 mol % under conditions that did not require the exclusion of air or moisture. The utility of this N-heterocyclic ring-forming strategy as a synthetic tool that makes use of unsaturated alcohols was exemplified by the conversion of the (Z)-2-methylene-1-sulfonylindolin-3-ol to examples of other members of the indole family of compounds.