Synthesis of pyrrolo[3′,4′:2,3]azepino[4,5,6‐cd]indole‐8,10‐diones

Zusammenfassung

3-Amino-4-(3-indolyl)pyrrolin-2,5-diones are condensed with various aldehydes and ketones to the corresponding imines. Under Pietet-Spengler conditions, the latter do not cyclize to pyrrolo-beta -carbolines, but readily yield pyrrolo[3',4':2,3]azepino[4,5,6-cd]indole-8,10-diones.