反应详情

5-Allyl-3-(2-fluoro-4-methylphenyl)-4-phenyl-1H-pyrazole (1.0 g, 3.42 mmol) was dissolved in methanol (40 mL) and dichloromethane (10 mL) and cooled to −78° C. on a dry-ice/acetone bath. Ozone was bubbled through the solution for 2 h, until the solution appeared light blue. To the reaction added sodium borohydride (0.129 g, 3.42 mmol) slowly. Upon complete addition, the reaction was removed from the dry-ice bath and stirred at room temperature for 1 h. Excess solvent was removed under reduced pressure and the reaction was extracted with EtOAc/H2O, dried over MgSO4, and purified by column chromatography to give the title compound as clear oil (0.70 g). LCMS m/z=297.2 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ ppm 2.30 (s, 3H), 2.79 (t, J=7.20 Hz, 2H), 3.62 (t, J=7.33 Hz, 2H), 6.93-7.00 (m, 1H), 7.09-7.14 (m, 2H), 7.15-7.23 (m, 3H), 7.25-7.31 (m, 2H), 12.86 (bs, 1H).

1. customOzone was bubbled through the solution for 2 h, until the solution
2. additionUpon complete addition
3. customthe reaction was removed from the dry-ice bath
4. customExcess solvent was removed under reduced pressure
5. extractionthe reaction was extracted with EtOAc/H2O
6. dry with materialdried over MgSO4
7. custompurified by column chromatography