Acetic Acid → Tert-butyl 2-{[4-({[2-(acetylamino)-1,3-thiazol-4-yl]methyl}amino)benzoyl]carbamoyl}hydrazinecarboxylate

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Reaction Conditions

Reaction Steps

tert-Butyl 2-{[4-({[2-(acetylamino)-1,3-thiazol-4-yl]methylidene}amino)benzoyl]carbamoyl}hydrazinecarboxylate (778.5 mg, 1.800 mmol) was dissolved in a mixed solvent of anhydrous tetrahydrofuran (18 ml) and anhydrous methanol (9 ml), and the mixture was cooled to 0° C. Sodium borohydride (68.1 mg, 1.80 mmol) was added and the mixture was stirred at room temperature for 30 min. Acetic acid (0.22 ml, 3.85 mmol) was added and the mixture was stirred for 15 min and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (FUJI SILYSIA CHEMICAL LTD. BW-300SP 40 g, dichloromethane:methanol=20:1→15:1). The pure fractions were concentrated under reduced pressure, ethyl acetate (30 ml) and tert-butyl methyl ether (10 ml) were added to the residue, and the resulting solid was collected by filtration and dried under reduced pressure to give tert-butyl 2-{[4-({[2-(acetylamino)-1,3-thiazol-4-yl]methyl}amino)benzoyl]carbamoyl}hydrazinecarboxylate (653.1 mg, 1.503 mmol, yield 83.5%) as a white solid.

Provenance & Evidence