New methodology for the preparation of pyrrole and indole derivatives via iminophosphoranes:synthesis of pyrrolo[1,2-a]quinoxalines, indolo[3,2-c]quinolines and indolo[1,2-c]quinazolines

Article abstract of DOI:10.1016/S0040-4020(01)81384-3

The aza-Wittig reaction of iminophosphorane N-[o-(triphenylphosphoranylidene)amino]-phenyl pyrrole 4 with heterocumulenes leads to functionalized pyrrolo[1,2-a]quinoxalines. Iminophosphorane 19, derived from 2-(o-amino)phenyl indole, reacts under mild con