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.