反应详情

To a solution of 5-(4-chloro-phenyl)-6-(2,4-dichlorophenyl)-1-phenyl-1H-pyrazolo[3,4-b]pyridin-4-ylamine (16 mg, 0.034 mmol) in CH3CN (0.4 mL) is added cone. HCl (0.8 mL). NaNO2 (20 mg, 0.29 mmol) is added into the mixture at 0° C. After the addition, the mixture is warmed up to room temperature and stirred for 24 h. The mixture is then neutralized to pH˜7 by adding saturated aqueous NaHCO3 and extracted with EtOAc (3×3 mL). The combined organic layers are concentrated and purified by preparative thin layer chromatography to provide the titled compound as a white solid (4 mg, 24%). 1H NMR (CDCl3) δ(ppm) 8.35(s, 1H), 8.28 (d, 2H), 7.50 (t, 2H), 7.27-7.37(m, 2H), 7.24-7.26 (m, 2H), 7.07-7.16 (m, 4H); HPLC-MS calculated for C24H13Cl4N3 (M+1+): 484.0. Found: 484.1.

1. additionAfter the addition
2. extractionextracted with EtOAc (3×3 mL)
3. concentrationThe combined organic layers are concentrated
4. custompurified by preparative thin layer chromatography