tert-Butanol → Tert-butyl [5-benzyloxy-6-(3-chlorobenzylcarbamoyl)-1-(2,2-dimethoxyethyl)-4-oxo-1,4-dihydropyridin-3-yl]carbamate

Participants

Reaction Steps

To a solution of 5-benzyloxy-6-(3-chlorobenzylcarbamoyl)-1-(2,2-dimethoxyethyl)-4-oxo-1,4-dihydropyridine-3-carboxylic acid (50 mg) in dimethylformamide (0.3 ml) were added triethylamine (0.07 ml) and diphenylphosphoryl azide (0.054 ml). After stirring at room temperature for 1 hr, tert-butanol (0.3 ml) was added, and the mixture was heated to 100° C. and stirred for 1 hr. After cooling to room temperature, saturated aqueous ammonium chloride solution (5 ml) and water (5 ml) were added, and the mixture was extracted twice with ethyl acetate (15 ml each). The ethyl acetate layer was washed with water, dried and concentrated. The obtained-residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:2) to give tert-butyl [5-benzyloxy-6-(3-chlorobenzylcarbamoyl)-1-(2,2-dimethoxyethyl)-4-oxo-1,4-dihydropyridin-3-yl]carbamate (40 mg).

Provenance & Evidence