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0 °C

To a solution of benzyl 4-{[5-(2-chlorophenyl)-1-(2,6-dichlorophenyl)-2-oxo-1,2,3,4-tetrahydroquinazolin-7-yl]methyl}-2-methylpiperazine-1-carboxylate (105 mg, 0.16 mmol) in methylene chloride (2 mL) at 0° C. was added 30% HBr/HOAc (0.32 mL, 1.62 mmol) slowly. The resulting reaction mixture was stirred at 0° C. for 30 min, and then at rt for 30 min. The reaction was quenched with water, then added 5N NaOH solution to pH ˜1, and extracted with methylene chloride (50 mL×3) and ethyl acetate (50 mL×2). The organic layer was washed with brine and dried over anhydrous sodium sulfate. Removal of the solvent and subsequent purification by preparative thin layer chromatography using 8% of 2N ammonium in methanol/methylene chloride as eluent provided 5-(2-chlorophenyl)-1-(2,6-dichlorophenyl)-7-[(3-methylpiperazin-1-yl)methyl]-3,4-dihydroquinazolin-2(1H)-one as a white solid. 1H NMR (CDCl3, 500 MHz): δ 1.06 (d, 3H, J=4.8 Hz), 1.72 (m, 1H), 2.06 (m, 1H), 2.69 (m, 2H), 2.82 (t, 2H, J=9.3 Hz), 2.98 (d, 1H, J=11.9 Hz), 3.40 (m, 2H), 4.34 (abq, 2H, J=14.4 Hz), 5.10 (s, 1H), 6.17 (s, 1H), 6.84 (s, 1H), 7.30-7.60 (m, 7H). MS (API-ES+): 517 (M+H).

1. customThe resulting reaction mixture
2. waitat rt for 30 min
3. customThe reaction was quenched with water
4. additionadded 5N NaOH solution to pH ˜1
5. extractionextracted with methylene chloride (50 mL×3) and ethyl acetate (50 mL×2)
6. washThe organic layer was washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. customRemoval of the solvent and subsequent purification by preparative thin layer chromatography