Sodium Pyrosulfite → N-{[6-bromo-2-oxo-4-(trifluoromethyl)-1,2, 3,4-tetrahydroquinazolin-4-yl]methyl}-4-fluorobenzamide

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Reaction Steps

To a stirring solution of N-{[6-bromo-1-(4-methoxybenzyl)-2-oxo-4-(trifluoromethyl)-1,2,3,4-tetrahydroquinazolin-4-yl]methyl}-4-fluorobenzamide (260 mg, 0.46 mmol) in acetonitrile (6 mL), an aqueous solution (1 mL) of cerium ammonium nitrate (755 mg, 1.38 mmol) was added dropwise at room temperature. The reaction solution was stirred at room temperature for 4 hours. Sodium pyrosulfite was added to the reaction solution, and the solution was stirred for 30 minutes, and then diluted with ethyl acetate and the organic layer was separated. The organic layer was washed sequentially with water and saturated brine and then dried over magnesium sulfate. After the drying agent was removed by filtration, the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=2/1), whereby the objective compound (150 mg, 73%) was obtained as a white solid.

Provenance & Evidence