benzyl N'-[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridine-2-carbonyl]hydrazinecarboxylate → 6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridine-2-carbohydrazide

Participants

Reaction Steps

Under a nitrogen atmosphere, to a mixture of benzyl 2-{[6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl]carbonyl}hydrazinecarboxylate (14.6 g) in methanol (150 mL) and THF (100 mL) was added 5% palladium-carbon (1.5 g) at room temperature, and the mixture was stirred at room temperature for 6 hr under a hydrogen atmosphere. Under a nitrogen atmosphere, the catalyst was filtered off, and the solvent in the filtrate was evaporated under reduced pressure. To a mixture of the residue in ethanol (200 mL) and THF (400 ml) was added 5% palladium-carbon (1.5 g) at room temperature, and the mixture was stirred at room temperature overnight under a hydrogen atmosphere. Under a nitrogen atmosphere, the catalyst was filtered off, and the solvent in the filtrate was evaporated under reduced pressure. The residue was collected by filtration, washed with ethyl acetate and dried to give the title compound (3.9 g). The solvent in the mother liquor was evaporated under reduced pressure, and the residue was collected by filtration, washed with ethyl acetate and dried to give the title compound (2.6 g).

Provenance & Evidence