反应详情

To a solution of methyl 3-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)propanoate (0.200 g, 0.44 mmol) in THF (10 mL), water (5 mL) and methanol (3 mL) was added lithium hydroxide (0.053 g, 2.21 mmol). The reaction was stirred for 2 h at rt. After that time the reaction was concentrated under reduced pressure, diluted with water (5 mL) and acidified using 1N HCl to pH 4.5-5.0. The precipitated solids were collected by filtration, washed with water and dried under high vacuum to give 3-(4-(6-(5,7-dimethoxy-4-oxo-3,4-dihydroquinazolin-2-yl)pyridin-2-yl)piperazin-1-yl)propanoic acid (0.160 g, 83%) as a yellow solid: mp 241° C. dec.; 1H NMR (400 MHz, DMSO-d6) δ 11.15 (s, 1H), 7.68-7.80 (m, 2H), 7.09 (d, J=8.20 Hz, 1H), 6.78 (d, J=1.95 Hz, 1H), 6.58 (d, J=1.95 Hz, 1H), 3.91 (s, 3H), 3.86 (s, 3H), 3.73 (br s, 4H), 2.77-2.85 (m, 2H), 2.73 (br s, 4H), 2.55 (t, J=7.22 Hz, 2H); ESI MS m/z 440 [M+H]+.

1. concentrationAfter that time the reaction was concentrated under reduced pressure
2. additiondiluted with water (5 mL)
3. filtrationThe precipitated solids were collected by filtration
4. washwashed with water
5. customdried under high vacuum