反应详情

A solution of N-(2-cyano-3-(methylamino)phenylcarbamoyl)benzamide (Example 157a) (0.05 g, 0.17 mmol) and NaOH (2N, 0.17 mL) in EtOH (6 mL) was stirred at 90° C. under nitrogen for half an hour. The reaction mixture was cooled down to room temperature, and concentrated under vacuum. H2O (1 mL) was added and the reaction mixture was neutralized to pH˜4 with 10% AcOH. The resultant precipitation was filtered and dried under vacuum. The crude product was purified by preparative thin layer chromatography using a DCM/MeOH (9:1) solution as eluant, to give 4-amino-5-(methylamino)quinazolin-2(1H)-one (18.2 mg, 56%). 1H NMR (400 MHz, DMSO-d6) δ 2.76 (s, 3H), 6.10 (d, J=7.6 Hz, 1H), 6.12 (d, J=8 Hz, 1H), 7.13 (t, J=8 Hz, 1H), 7.25 (bs, NH), 9.66 (bs, NH) 10.13 (bs, 2H). MS 191 (MH+).

1. concentrationconcentrated under vacuum
2. additionH2O (1 mL) was added
3. customThe resultant precipitation
4. filtrationwas filtered
5. customdried under vacuum
6. customThe crude product was purified by preparative thin layer chromatography