Photocyclisation of enamides. Part XI. Syntheses of benzo[i]phenanthridines related to aza-steroids
Abstract
Photocyclisation of various types of N-(1-naphthoyl)enamines (IIa, b, and d) prepared from the corresponding cyclohexanones provides a general route to benzo[i]phenanthridines [(III)–(V), (VII), (VIII), and (XIV)–(XVI)] related to 6-aza-steroids.