p-Toluenesulfonic acid → 2-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)quinazolin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of anthranilamide (0.15 g, 1.10 mmol), 4-[2(tert-butyl-dimethyl-silanyloxy)-ethoxy]-3,5-dimethyl-benzaldehyde (0.340 g, 1.101 mmol), sodium hydrogensulfite (0.126 g, 1.101 mmol) and p-toluenesulfonic acid (20 mg) in N,N-dimethyl acetamide (5 mL) was stirred at 150° C. for 3 h under nitrogen. The reaction mixture was cooled to room temperature and diluted with water (20 mL). The solid was collected by filtration, washed with water (10 mL×3) and dried under high vacuum to provide desired compound (328 mg, 70%), as a white solid. A solution of the above described compound (0.316 g, 0.745 mmol) in THF (3 mL) was cooled to 0° C. under nitrogen and TBAF (1.5 mL, 1.49 mmol) was added, followed by stirring at room temperature for 1 h. The reaction mixture was diluted with cold water (30 mL), the white precipitate was filtered off, washed with water (15 mL×3) and MeOH (20 mL×3) and dried under high vacuum, to afford 2-(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)quinazolin-4(3H)-one (150 mg, 65%), as a white solid. Selected data: MS (ES) m/z: 311.04; MP 260-261° C.

Provenance & Evidence