Water → 5-chloro-2-[3-(2-chloroacetamidomethyl)-5-methyl-4H-1,2,4-triazol-4-yl]-benzophenone

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Reaction Steps

To a solution of 5-chloro-2-(3-aminomethyl-5-methyl-4H-1,2,4-triazol-4-yl)-benzophenone dihydrobromide (0.5 g) in dimethylformamide (3 ml), chloroacetyl chloride (0.2 g) is dropwise added under ice cooling, and the resultant mixture is stirred. The reaction mixture is allowed to stand at room temperature overnight, mixed with water (3 ml), neutralized with aqueous sodium bicarbonate and shaken with methylene chloride. The methylene chloride layer is washed with water and saturated aqueous saline solution in order, dried over sodium sulfate, and evaporated under reduced pressure to remove the solvent. The residue is recrystallized from ethyl acetate/n-hexane to give 5-chloro-2-[3-(2-chloroacetamidomethyl)-5-methyl-4H-1,2,4-triazol-4-yl]-benzophenone (0.35 g) as crystals melting at 140° to 141° C.

Provenance & Evidence