Ammonia → 8-chloro-6-phenyl-4H-pyrazolo[1,5-a][1,4]benzodiazepine-2-carboxamide

Participants

Reaction Steps

A solution of 750 mg. (2.13 mmol) of the end product of Example 9 in 50 ml. methanol in a glass bomb was cooled to 3° and saturated with ammonia. The glass bomb was then sealed and the reaction heated to 70° with stirring, for 16 hours. After cooling to 5°, the bomb was opened, the contents transferred to a r.b. flask and concentrated in vacuo. Recrystallization was acetone/hexane yielded end product, mp 216°-218°. An analytical sample was prepared by an additional recrystallization from acetone/hexane and obtained as pale yellow needles: mp 217°-219°.

Provenance & Evidence