Cesium Carbonate-Promoted Hydroamidation of Alkynes: Enamides, Indoles and the Effect of Iron(III) Chloride
作者:María Teresa Herrero、Jokin Díaz de Sarralde、Raul SanMartin、Laura Bravo、Esther Domínguez
DOI:10.1002/adsc.201200430
日期:2012.11.12
A series of enamide derivatives was prepared by a simple procedure for the hydroamidation of alkynes with amides and sulfonamides. The use of such a mild base as cesium carbonate promotes the latter transformation, and the addition of catalytic amounts of iron(III) chloride has a beneficial effect in the outcome of some of the presented hydroamidation reactions. A range of indoles was also synthesized
通过简单的方法制备了一系列的酰胺衍生物,用于炔烃与酰胺和磺酰胺的加氢酰胺化。使用诸如碳酸铯之类的弱碱可以促进后者的转化,并且催化量的氯化铁(III)的添加在某些所述加氢酰胺化反应的结果中具有有益的作用。还通过两种互补方法从邻-炔基苯胺合成了一系列吲哚,这对于从邻-(2-氨基苯基炔基)苯胺构建吲哚并[1,2- c ]喹唑啉四环体系是有用的。
Anti-Markovnikov stereoselective hydroamination and hydrothiolation of (hetero)aromatic alkynes using a metal-free cyclic trimeric phosphazene base
作者:Na Zhao、Chengdong Lin、Lirong Wen、Zhibo Li
DOI:10.1016/j.tet.2019.04.075
日期:2019.6
Hydroamination and hydrothiolation are the most efficient and completely atom-economical process to construct important enamine and vinylsulfide intermediates in pharmaceutical and organic chemistry. The cyclic trimeric phosphazene base (CTPB) showed great catalytic activity for the anti-Markovnikov stereoselective hydroamination and hydrothiolation of alkynes in good to excellent yields. A broad
Enamides and enimides were prepared stereospecifically from vinyl bromides by direct vinylic substitution in the presence of copper salt in aprotic polar solvents.