1-Hydroxybenzotriazole → 5-Phenyl-isoxazole-3-carboxylic acid {2-[4-(2-bromo-phenoxy)-piperidin-1-yl]-2-oxo-ethyl}-amide

Participants

Reaction Steps

To a stirred solution of [(5-phenyl-isoxazole-3-carbonyl)-amino]-acetic acid (72.5 mg, 0.00026 mol) in DMF (1.5 mL) was added DIPEA (0.166 g, 0.00128 mol), HOBt (43.3 mg, 0.00032 mol) and EDCI.HCl (61.5 mg, 0.00032 mol) at ambient temperature. After 2 minutes 4-(2bromo-phenoxy)-piperidine trifluoroacetate (0.1 g, 0.00027 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 washed with brine solution, dried over sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by column chromatography using silica gel, 60-120 mesh (40% ethyl acetate in hexane) to afford 0.044 g (35%) of 5-phenyl-isoxazole-3-carboxylic acid {2-[4-(2-bromo-phenoxy)-piperidin-1-yl]-2-oxo-ethyl}-amide. LCMS: 484.08 (M+1)+, 77.84%, 1H NMR (DMSO-d6): δ 8.63 (t, 1H), 7.98 (m, 2H), 7.6 (m, 4H), 7.4 (m, 2H), 7.2 (m, 1H), 6.9 (t, 1H), 4.8 (s, 1H), 4.3 (m, 2H), 3.5 (m, 4H), 1.5 (m, 4H).

Provenance & Evidence