Triethylamine → 1-methyl-8-chloro-6-phenyl-4H-s-triazolo-[4,3-a][1,5]benzodiazepin-5-one

Participants

Reaction Steps

A mixture of 3.3g (0.01M) of 7-chloro-3,5-dihydro-2-(N-nitrosomethylamino)-5-phenyl-4H-1,5-benzodiazepin-4-one, 2g of acetylhydrazine, 5 ml of triethylamine and 50 ml of n-butanol was heated to reflux for 3 hrs. Half of the solvent was then removed by distillation and replaced by fresh n-butanol. Refluxing was continued for 3 days. The residue obtained after evaporation was chromotographed over 100 g of silical gel(Merck 70-230 mesh) using 10% (v/v) ethanol in methylene chloride for elution. Crystallization of the pure fraction from methylene chloride/ether yielded the above maned product, m.p. 298°-300°.

Provenance & Evidence