反应详情

温度

50 °C

To a stirred solution of NCS (85 μL, 0.634 mmol) and pyridine (4 μL) in chloroform (2.5 mL) was added p-trifluoromethoxybenzaldehyde oxime (130 mg, 0.634 mmol). The reaction was heated at 50° C. for 3 h. 4-Aminostyrene (93 μL, 0.793 mmol) was then added followed by a solution of triethylamine (93 μL, 0.666 mmol) dissolved in chloroform (0.5 mL) dropwise. The reaction was stirred at 50° C. for 3 h. The cooled solution was diluted with chloroform (15 mL) and washed with water (2×10 mL). The organic phase was then dried over MgSO4, filtered and concentrated. The residue was purified via radial chromatography using a 2:1 hexane/EtOAc solution as the eluent (Rf=0.18) to afford 4-[3-(4-trifluoromethoxyphenyl)-4,5-dihydro-isoxazol-5-yl]-phenylamine (125 mg; 61%): 1H NMR (400 MHz, CDCl3) δ 7.73 (d, J=8.2 Hz, 2H), 7.25 (d, J=8.2 Hz, 2H), 7.17 (d, J=8.2 Hz, 2H), 6.68 (d, J=8.2 Hz, 2H), 5.65 (dd, J=10.9, 8.9 Hz, 1H), 3.55-3.75 (br s, 2H), 3.67 (dd, J=16.8, 10.9 Hz, 1H), 3.30 (dd, J=16.8, 8.9 Hz, 1H); EIMS m/z 322 (M+).

1. washwashed with water (2×10 mL)
2. dry with materialThe organic phase was then dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue was purified via radial chromatography