p-Toluenesulfonic acid monohydrate → 2-[4-(2-hydroxy-ethoxy)-3-methyl-phenyl]-5,7-dimethoxy-3H-quinazolin-4-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(2-hydroxy-ethoxy)-3-methylbenzaldehyde (1.46 g, 8.08 mmol) and 2-amino-4,6-dimethoxybenzamide (1.58 g, 8.08 mmol) in N,N-dimethylacetamide (20 mL) were added NaHSO3 (58.5 wt %, 2.20 g, 12.12 mmol) and p-toluenesulfonic acid monohydrate (0.38 g, 2.02 mmol). The reaction mixture was stirred at 110° C. for 16 hours, then cooled to room temperature. N,N-dimethylacetamide was removed under reduced pressure. The residue was triturated with water (50 mL). The resulting slurry was filtered and solid was washed with water, ether, and hexanes to obtain 2-[4-(2-hydroxy-ethoxy)-3-methyl-phenyl]-5,7-dimethoxy-3H-quinazolin-4-one as a beige solid. Yield: 2.75 g (95%).

Provenance & Evidence