Acetonitrile → 2,3-dimethyl-4-phenyl-3H-1,3-benzodiazepin hydrochloride

Participants

Reaction Conditions

Reaction Steps

A heterogeneous mixture of N-methyl-2-amino-α-phenylphenethylamine dihydrochloride (150 g, 0.5 mol) in acetonitrile (500 ml) was treated with triethylorthoacetate (202 ml, 1.1 mol) and heated to 70° C. for 2 hours with stirring under a dry nitrogen atmosphere. The reaction mixture was filtered, concentrated in vacuo, and the residual solid recrystallized from 2-propanol at -10° C. to give 2,3-dimethyl-4-phenyl-3H-1,3-benzodiazepine hydrochloride (118 g, 0.413 mol) in 83% yield. The product had a melting point of 239.5°-241° C.

Provenance & Evidence