反应详情

温度

50 °C

To a solution of the title compound of Step A (680 mg, 2.95 mmol) in MeOH (15 mL) was added 4 M LiOH (4 mL). The mixture was heated at 50° C. overnight. MeOH was removed and HCl added until pH=2. White solids precipitated from the reaction mixture and the precipitate was filtered, washed with EtOAc and collected to give intermediate A-31, which was used without further purification in subsequent steps. MS (ESI) mass calcd. for C12H12N2O2, 216.1. m/z found 217.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6) δ 12.87 (s, 1H), 7.95 (dd, J=7.8, 1.5 Hz, 1H), 7.67 (td, J=7.5, 1.5 Hz, 1H), 7.59 (td, J=7.6, 1.4 Hz, 1H), 7.33 (dd, J=7.6, 1.4 Hz, 1H), 7.25 (s, 1H), 3.48 (s, 3H), 1.77 (s, 3H).

1. customMeOH was removed
2. additionHCl added until pH=2
3. customWhite solids precipitated from the reaction mixture
4. filtrationthe precipitate was filtered
5. washwashed with EtOAc
6. customcollected
7. customto give intermediate A-31, which
8. customwas used without further purification in subsequent steps