1-Hydroxybenzotriazole → 5-phenyl-1H-pyrazole-3-carboxylic acid {2-[4-(2,5-difluoro-phenoxy)-piperidin-1-yl]-2-oxo-ethyl}-amide

Participants

Reaction Steps

To a stirred solution of [(5-phenyl-1H-pyrazole-3-carbonyl)-amino]-acetic acid (0.075 g, 0.0003 mol) in DMF (2 mL) was added DIPEA (0.135 g, 0.0012 mol), HOBt (0.061 g, 0.00045 mol) and EDCI.HCl (0.086 g, 0.00045 mol) at ambient temperature. After 2 minutes, 4-(2,5-difluoro-phenoxy)-piperidine hydrochloride (0.076 g, 0.0003 mol) was added and the resulting mixture was stirred overnight. The reaction mixture was then diluted with cold water and the product was extracted with ethyl acetate. The ethyl acetate layer was collected and washed with brine solution, dried over sodium sulfate and concentrated. The resulting residue was purified by column chromatography using neutral aluminum oxide (5% methanol in chloroform) to afford 0.065 g (49%) of 5-phenyl-1H-pyrazole-3-carboxylic acid {2-[4-(2,5-difluoro-phenoxy)-piperidin-1-yl]-2-oxo-ethyl}-amide. LCMS: 441.17 (M+1)+, 91.07%, 1H NMR (DMSO-d6): δ 13.8 (bs, 1H), 8.0 (bs, 1H), 7.8 (m, 2H), 7.4 (m, 5H), 7.2 (m, 1H), 6.8 (m, 1H), 4.6 (m, 1H), 4.2 (m, 2H), 3.9 (m, 1H), 3.8 (m, 1H), 2.0 (m, 2H), 1.6 (m, 2H).

Provenance & Evidence