Triethylamine → 3-(2-Ethoxycarbonylhydrazino)-5-methyl-6-phenyl-1,2,4-triazine

Participants

Reaction Steps

A solution of ethyl chloroformate (1.98 g) in methylene chloride (5 ml) was added dropwise to a stirred solution of 3-hydrazino-5-methyl-6-phenyl-1,2,4-triazine (3.68 g) in methylene chloride (40 ml) under ice cooling in 15 minutes, and the reaction mixture was treated with a solution of triethylamine (1.8 g) in methylene chloride (10 ml) under ice cooling. The reaction mixture was concentrated under reduced pressure. The residue was extracted with ethyl acetate after addition of water. The extract was washed with 5% hydrochloric acid and water, dried over magnesium sulfate, concentrated under reduced pressure, and the residue was pulverized with diisopropyl ether. The resulting precipitates were collected by filtration, washed with water and dried to give 3-(2-ethoxycarbonylhydrazino)-5-methyl-6-phenyl-1,2,4-triazine (3.23 g).

Provenance & Evidence