反应详情

温度

60 °C

To a solution of 3-fluoro-5-(fluoromethyl)benzaldehyde (890 mg, 5.70 mmol) and (R)-2-methylpropane-2-sulfinamide (760 mg, 6.27 mmol) in DCE (19.0 mL) was added copper(II) sulfate (anhydrous) (1.820 g, 11.40 mmol), the suspension was stirred under nitrogen at 60° C. in an oil bath for overnight. The suspension turned to light blue color. Cooling down, the reaction mixture was filtered though a plug of Celite and rinsed with DCM, the filtrate was concentrated to yield the crude product. The crude product was purified by flash chromatograph (0-30% EtOAc in heptane) to yield the (R,E)-N-(3-fluoro-5-(fluoromethyl)benzylidene)-2-methylpropane-2-sulfinamide (900 mg, 60.9% yield) as light yellow color oil. LCMS (m/z): 260.1 (MH+), 0.88 min. 1H NMR (400 MHz, CDCl3) δ ppm 8.57 (s, 1H), 7.60 (s, 1H), 7.56 (d, J=8.8 Hz, 1H), 7.26-7.22 (m, 1H), 5.50 (s, 1H), 5.38 (s, 1H), 1.29-1.23 (m, 9H)

1. temperatureCooling down
2. filtrationthe reaction mixture was filtered though a plug of Celite
3. washrinsed with DCM
4. concentrationthe filtrate was concentrated
5. customto yield the crude product
6. customThe crude product was purified by flash chromatograph (0-30% EtOAc in heptane)