AN EFFICIENT, HIGH-YIELD, ONE-POT PREPARATION OF PYRROLO[2,3-B]PYRIDINES BY A CONSECUTIVE AZA-WITTIG REACTION-ELECTROCYCLIC RING CLOSURE-INTRAMOLECULAR AMINATION PROCESS

Aza Wittig reaction of iminophosphoranes derived from ethyl (E,E,E)-1- azido-7-phenyl-2,4,6-heptatrienoate with aromatic isocyanates in nitro benzene at reflux temperature leads directly to pyrrolo[2,3-b]pyridine s in good yields.