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‐substitutedindoles 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