... El-Dean, AA Hassan and HS El-Kashef [a] S. Rault and M. Robba* [b] [a] Chemistry Department, Faculty ... 1996 Synthesis of some Pyiimido[4',5':4,5]thieno[2,3-b]quinolines and Related Heterocycles 433 Scheme 6 ... cu, cu, NH2 cu, N§CH N—Ph / / / ~m “J; ~CN 4' ~m \ \ N 5 N 5 N 5 ...