反应详情

To a solution of 2-(3,5-bis-trifluoromethyl-benzoylamino)-4-nitro-benzoic acid methyl ester (1.85 g, 4.24 mmol) in ethyl acetate (250 mL) in a Parr flask was added 10% palladium on carbon (0.20 g). The flask was attached to a Parr shaker and purged with nitrogen gas. The flask was then charged to 50 psi with hydrogen gas and the shaker was activated. After 2 hours the apparatus was recharged to 50 psi with hydrogen gas and the mixture was allowed to agitate. After an additional 2 hours the apparatus was recharged to 50 psi with hydrogen gas and the mixture was allowed to agitate for 4 additional hours (8 hours total time). The mixture was removed from the apparatus and filtered through a plug of Celite. The Celite was rinsed with ethyl acetate until no more color came through and the filtrate was concentrated under reduced pressure. The crude material was dissolved in ethyl acetate, dried over MgSO4, filtered and concentrated under reduced pressure to give 4-amino-2-(3,5-bis-trifluoromethyl-benzoylamino)-benzoic acid methyl ester (1.70 g, 99%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6); δ 13.52 (s, 1H), 8.49 (s, 2H), 8.44 (s, 1H), 7.83 (d, 1H), 7.73 (d, 1H), 6.40-6.36 (m, 2H), 6.37 (s, 2H), 6.36 (dd, 1H), 3.80 (s, 3H).

1. custompurged with nitrogen gas
2. additionThe flask was then charged to 50 psi with hydrogen gas
3. waitAfter an additional 2 hours the apparatus was recharged to 50 psi with hydrogen gas
4. stirringto agitate for 4 additional hours (8 hours total time)
5. customThe mixture was removed from the apparatus
6. filtrationfiltered through a plug of Celite
7. washThe Celite was rinsed with ethyl acetate until no more color
8. concentrationwas concentrated under reduced pressure
9. dissolutionThe crude material was dissolved in ethyl acetate
10. dry with materialdried over MgSO4
11. filtrationfiltered
12. concentrationconcentrated under reduced pressure