37669-57-1

Arfendazam,ZYF Pharm Chemical

A phosgene was mixed with ethanol, then cooling by ice-water the solution of 8-chloro-1-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine-2-one in chloroform was added dropwise, mixed and allowed to stand. Then the reaction mixture was concentrated, and crystals was filtered off. So the 7- chloro-2,3,4,5-tetrahydro-4-oxo-5-phenyl-1H-1,5-benzodiazepine-1-carboxylic acid ethyl ester was obtained, melting point 172°-173°C (dec.).

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