Synthesis of novel 1 H ‐imidazo[5,1‐ B ][3]benzazepine‐1,3(2 H )‐dione and pyrimido[6,1‐ B ][3]benzazepine‐1,3,4(2 H )‐trione

Two novel tricyclic ring systems derived from 3‐benzazepines were synthesized; the first, a 6,7,5‐ring, 1 H ‐imidazo[5,1‐ b ][3]benzazepine‐1,3(2 H )‐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(2 H )‐trione was prepared with base and oxalyl chloride.