反应详情

To a stirred solution of [(5-phenyl-1H-pyrazole-3-carbonyl)-amino]-acetic acid (0.15 g, 0.0006 mol) in DMF (3 mL) was added DIPEA (0.27 g, 0.0021 mol), HOBt (0.12 g, 0.0009 mol) and EDCI.HCl (0.17 g, 0.0009 mol) at ambient temperature. After 2 minutes 4-(2-nitro-phenoxy)-piperidine hydrochloride (0.19 g, 0.00073 mol) was added and the resulting mixture was stirred overnight. The reaction mixture was then diluted with cold water. The product was extracted with ethyl acetate, and the organic layer was washed with brine solution, dried over sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by column chromatography using neutral aluminium oxide (5% methanol in chloroform) to afford 0.1 g (44%) of 5-phenyl-1H-pyrazole-3-carboxylic acid {2-[4-(2-nitro-phenoxy)-piperidin-1-yl]-2-oxo-ethyl}-amide. LCMS: 450.17 (M+1)+, 96.5%, 1H NMR (DMSO-d6): δ 8.1 (bs, 1H), 7.9 (m, 3H), 7.6 (m, 1H), 7.5 (m, 4H), 7.1 (m, 2H), 5.0 (m, 1H), 4.2 (m, 2H), 3.8 (m, 8H), 2.0 (m, 2H).

1. extractionThe product was extracted with ethyl acetate
2. washthe organic layer was washed with brine solution
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe resulting residue was purified by column chromatography