反应详情

温度

-20 °C

Borane-tetrahydrofuran complex (1M in tetrahydrofuran, 800 mL, 800 mmol) was added at −20° C. over 45 min to a solution of 3,4-dinitrobenzoic acid (93.5 g, 441 mmol) in tetrahydrofuran (300 mL). The resulting mixture was stirred at −20° C. for 1 h and then warmed to room temperature and stirred overnight. It was quenched by the addition of 32 mL of 1:1 acetic acid/water. Solvents were removed in vacuo and the residue was poured into an ice-cold 1000 mL of sat. sodium bicarbonate with vigorous stirring over 15 min. The mixture was extracted with ethyl acetate (3×500 mL). The combined organic layers were washed with sat. sodium bicarbonate, brine and dried over sodium sulfate. After filtration, solvents were removed to afford the title compound as a light yellow solid (100%). 1H-NMR (CDCl3, 500 MHz) δ 7.91(d, J=8.0Hz, 1H), 7.89 (s, 1H), 7.71 (dd, J=8.5, 1.0Hz, 1H), 4.87 (s, 2H), 2.30 (s, 1H).

1. temperaturewarmed to room temperature
2. stirringstirred overnight
3. customIt was quenched by the addition of 32 mL of 1:1 acetic acid/water
4. customSolvents were removed in vacuo
5. additionthe residue was poured into an ice-cold 1000 mL of sat. sodium bicarbonate
6. stirringwith vigorous stirring over 15 min
7. extractionThe mixture was extracted with ethyl acetate (3×500 mL)
8. washThe combined organic layers were washed with sat. sodium bicarbonate, brine
9. dry with materialdried over sodium sulfate
10. filtrationAfter filtration, solvents
11. customwere removed