反应详情

温度

-78 °C

To a solution of 45 (1.90 g, 3.64 mmol) in anhydrous CH2Cl2 (60 mL) at −78° C. was added BCl3 (1 M solution in CH2Cl2, 30 mL, 30 mmol) dropwise. The mixture was stirred at −78° C. under nitrogen for 2 h, then at −60° C. for another 4 h. MeOH (10 mL) was added to quench the reaction, followed by 14% NH4OH solution to adjust the mixture to pH 7. After being stirred at room temperature for 1 h, the mixture was concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with CH2Cl2/MeOH (9:1 to 4:1) to give the title compound 46 as a pale yellow solid (810 mg, 65%). 1H NMR (DMSO-d6) δ 11.6 (s, 1H, NH), 8.19 (s, 1H, H-6), 7.20, 6.60 (2br, 2H, 20H), 5.15 (s, 2H, CH2N), 4.60 (m, 2H, CH2O), 3.53 (m, 1H, CHO), 3.41 (m, 2H, 2 CH2O).

1. waitat −60° C. for another 4 h
2. customto quench
3. customthe reaction
4. stirringAfter being stirred at room temperature for 1 h
5. concentrationthe mixture was concentrated in vacuo
6. customThe residue was purified by flash chromatography on silica gel eluting with CH2Cl2/MeOH (9:1 to 4:1)