反应详情

A solution of 4-(5-Trifluoromethyl-isoxazol-3-yl)-benzoic acid (Preparative Example 11, 256 mg, 1.0 mmol) in toluene (10 mL) was treated with DMF (˜5 μL) followed by oxalyl chloride (112 μL, 1.3 mmol). The reaction was allowed to stir for 3 hr then concentrated in vacuo to afford crude acid chloride which was dissolved in THF (5 mL) and treated with a THF solution (2 mL) of triethylamine (174 μL, 1.25 mmol) and piperidine (109 μL, 1.1 mmol). The reaction was allowed to stir for 3 hr and concentrated in vacuo to afford crude product which was filtered with the aid of water and solids air dried to afford product as a colorless solid (295 mg, 91%). 1H NMR (CDCl3) 1.55-1.70 (m, 6 H), 3.35 (br s, 2 H), 3.73 (br s, 2 H), 7.04 (s, 1 H), 7.52 (d, J=8.3, 2 H), 7.86 (d, J=7.9, 2 H). 13C NMR 24.7, 25.8, 26.8, 43.4, 49.0, 103.7, 118.0 (q, J=270), 127.3, 127.9, 128.4, 139.2, 162.2, 169.4. 19F NMR −64.6. LC/MS 6.49 min, [M+1]+ 325.

1. concentrationthen concentrated in vacuo
2. customto afford crude acid chloride which
3. stirringto stir for 3 hr
4. concentrationconcentrated in vacuo
5. customto afford crude product which
6. filtrationwas filtered with the aid of water and solids air
7. customdried