Über 4.4′‐Dihydrazino‐diphenylmethan

Indole β-nucleophilic substitution. Part 5. Synthesis of the four isomeric 5H-pyrido [x,y-b] carbazole-5,11-diones and benzo analogues

“…(EtOH) 242,27lsh, 290sh, and 364sh nm (log E 4.20, 3.95, 3.89, and 2.84); vmx. (Nujol) 3 350s, 1 665, and 1 640s cm-'; ' I: (CDC13) 1.56 (1 H, d, J 9 Hz, ArH), 1.67 (1 H, s, ArH), 1.82 (1 H, d, J 9 Hz, ArH), 2.00-2.08 (2 H, m, ArH), 2.32-2.52 (6 H,m, ArH), 2.61 (1 H, t, J 8 Hz, ArH), 2.85 (1 H, s, indole-3-H), 5.03 (2 H, s, CH20), and 6.50-6.80 (1 H, bs, exchangeable, OH); m/z 436 ( M + , 0.5%), 418 (I), 295 (9), 277 (7), 179 (16), and 77 (100) (Found: C, 60.4; H, 3.65; N, 6.3. C22H16N206S requires C, 60.55; H, 3.7; N, 6.4%).…”