A Practical Route to Substituted 7-Aminoindoles from Pyrrole-3-carboxaldehydes
作者:Victor K. Outlaw、Craig A. Townsend
DOI:10.1021/ol503078h
日期:2014.12.19
efficient conversion of pyrrole-3-carboxaldehydes to substituted 7-amino-5-cyanoindoles. Phosphine addition to fumaronitrile proceeds with prototropic rearrangement of the initially formed zwitterion to the thermodynamically favored phosphonium ylide, which is poised for in situ Wittig olefination. The predominantly E-alkene product positions the allylic nitrile for facile intramolecular Hoeben–Hoesch