反应详情

To a solution of 2-(4-amino-3,5-dimethylphenyl)-5,7-dimethoxyquinazolin-4(3H)-one (0.096 g, 0.295 mmol) and diisopropylethylamine (61.7 μL, 0.354 mmol), in DMF (2.96 mL) was added dropwise methanesulfonyl chloride (25.2 μL, 0.325 mmol). After stirring at room temperature for 18 h, the mixture was diluted with EtOAc (300 mL), washed with saturated aqueous sodium bicarbonate (2×75 mL), saturated aqueous LiCl (2×75 mL), dried over sodium sulfate, filtered and concentrated under vacuum. The residue was purified over silica gel (12 g, CH2Cl2/CH3OH) to provide (E)-N′-(4-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)-2,6-dimethylphenyl)-N,N-dimethylformimidamide (0.0502 g, 45%) as a white solid. Selected data: 1H NMR (300 MHz, DMSO-d6) δ 11.68 (s, 1H), 7.87 (s, 2H), 7.40 (s, 1H), 6.72 (d, J=2.31 Hz, 1H), 6.48 (d, J=2.31 Hz, 1H), 3.88 (s, 3H), 3.86 (s, 3H), 2.97 (s, 6H), 2.12 (s, 6H); MS (APCI) m/z 381 [M+H]+.

1. washwashed with saturated aqueous sodium bicarbonate (2×75 mL), saturated aqueous LiCl (2×75 mL)
2. dry with materialdried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated under vacuum
5. customThe residue was purified over silica gel (12 g, CH2Cl2/CH3OH)