反应详情

A solution of 4-(5-Trifluoromethyl-isoxazol-3-yl)-benzoic acid (Preparative Example 11, 1.024 g, 4.0 mmol) in dichloromethane (14 mL) at 0-5° C. was treated with DMF (2 mL) followed by DMAP (50 mg), hydroxylamine hydrochloride (468 mg, 4.8 mmol), triethylamine (458 μL, 4.8 mmol), and DCC (990 mg, 4.8 mmol). The reaction was allowed to warm to room temperature and stirred 16 hr then evaporated in vacuo. The crude material was then chromatographed on silica gel with EtOAc/hexanes (40%) as eluant to afford product as a colorless solid (890 mg, 74%). 1H NMR (CDCl3) 3.40 (s, 3 H), 3.57 (s, 3 H), 7.06 (s, 3), 7.82 (d, J=8.3, 2 H), 7.88 (d, J=8.8, 2 H). 13C NMR 33.7, 61.4, 103.7, 118.0 (q, J=460), 127.1, 129.3, 129.4, 136.6, 159.7 (q, J=42), 162.2, 169.0. 19F NMR −64.6. LC/MS 6.01 min, [M+1]+ 301.

1. customthen evaporated in vacuo
2. customThe crude material was then chromatographed on silica gel with EtOAc/hexanes (40%) as eluant