SYNTHESIS OF NOVEL 1H-IMIDAZO[5,1-B][3]BENZAZEPINE-1,3(2H)-DIONE AND PYRIMIDO[6,1-B][3]BENZAZEPINE-1,3,4(2H)-TRIONE

Two novel tricyclic ring systems derived from 3‐benzazepines were synthesized; the first, a 6,7,5‐ring, 1H‐imidazo[5,1‐b][3]benzazepine‐1,3(2H)‐dione was obtained using an unusual Stiles reaction while the second, an analogous 6,7,6‐ring, pyrimido[6,1‐b][3]benzazepine‐1,3,4(2H)‐trione was prepared with base and oxalyl chloride. Copyright © 1990 Journal of Heterocyclic Chemistry