Hydrazine hydrate (1:1) → N-benzyloxycarbonyl-3-(1-naphthyl)-L-alanyl-3-(2-thienyl)-DL-alanine hydrazide

Participants

Reaction Steps

A mixed solution of 1.0 g (194 mmole) of N-benzyloxycarbonyl-3-(1-naphthyl)-L-alanyl-3-(2-thienyl)-DL-alanine methyl ester and 0.64 g (0.2 mmole) of 80% hydrazine hydrate in 10 ml of dimethylformamide was stirred for 2 hours at room temperature and then left standing overnight at room temperature. Dimethylformamide was removed by evaporation under reduced pressure. Water was added to the residue, and the mixture was stirred to form a powdery precipitate, which was collected by filtration, washed with a mixture of diethyl ether and hexane and dried to yield 1.0 g (100%) of N-benzyloxycarbonyl-3-(1-naphthyl)-L-alanyl-3-(2-thienyl)-DL-alanine hydrazide melting at 163°-164° C.

Provenance & Evidence