Hydroformylation of 2-Alkynylanilines: Toward an Alternative Methodology for the Synthesis of 3-Substituted Indoles
作者:Cedric Holzapfel、Etelinda Dasilva、Laetitia Den Drijver、Tyler Bredenkamp
DOI:10.1002/cctc.201600659
日期:2016.9.21
potentially viable route for the synthesis of 3‐substituted indoles is presented herein. The methodology is based on a regioselective Rh‐catalysed hydroformylation of prepared 2‐alkyn‐1‐ylanilines. The requisite 2‐alkynylaniline substrates were prepared in high yields (>85 %) using the Pd‐catalysed Sonogashira reaction. A catalyst complex that comprises RhI(CO)(PPh3)3 and 1,2‐bis(diphenylphosphino)ethane
本文介绍了3-位取代的吲哚合成的潜在可行途径。该方法基于制备的2-炔基-1-基苯胺的区域选择性Rh催化加氢甲酰化作用。使用Pd催化的Sonogashira反应可高产率(> 85%)制备必需的2-炔基苯胺底物。包含Rh I(CO)(PPh 3)3和1,2-双(二苯基膦基)乙烷作为配体的催化剂配合物可实现炔基底物的定量转化,对于所需的3个取代的吲哚,其选择性> 75%。