Iminophosphorane-mediated synthesis of fused carbazoles. A facile one-pot preparation of 7H-pyrido [4,3-c]carbazole and 10H-pyrido[3,4-b]carbazole derivatives

Article abstract of DOI:10.1016/S0040-4020(01)86454-1

The aza Wittig-type reaction of iminophosphorane 3, ethyl α[(triphenylphosphoranylidene)amino]-β][3- (9-methyl)carbazolyl)acrylate with isocyanates leads to the corresponding pyrido[4,3-c]carbazoles 5. Similarly, iminophosphorane 8 undergoes pyrido annela