反应详情

温度

0 °C

A solution of methyl 4,7-dimethylpyrazolo[1,5-a]pyrazine-2-carboxylate (62 mg, 0.30 mmol) in DCM (5 mL) was cooled to 0° C. Diisobutylaluminium hydride (DIBAL-H) (1 M in cyclohexane, 1 mL, 0.33 mmol) was added to the above solution dropwise over 5 min. After addition, the mixture was stirred at 0° C. for 1 h. Saturated aqueous ammonium chloride solution (2 mL) was added to quench the reaction. Then 5 mL of saturated sodium bicarbonate aqueous solution was added. The mixture was extracted with DCM (3×15 mL). The combined organic layer was washed with brine, dried over sodium sulfate, filtered, evaporated, and chromatographed on silica gel using 5% MeOH in DCM as eluent to give 41 mg (77% yield) of the title compound as a yellow solid. ESI MS: m/z 178.1 [M+H]+. 1H NMR (400 MHz, CDCl3) δ 7.60 (s, 1H), 6.77 (s, 1H), 4.98 (d, J=6.0 Hz, 2H), 2.71 (s, 3H), 2.67 (s, 3H).

1. additionAfter addition
2. customto quench
3. customthe reaction
4. extractionThe mixture was extracted with DCM (3×15 mL)
5. washThe combined organic layer was washed with brine
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. customevaporated
9. customchromatographed on silica gel using 5% MeOH in DCM as eluent