反应详情

To a solution of cyclobutanecarbaldehyde (1.0 g, 11.89 mmol, 1.00 equiv) in CH2Cl2 (10 mL) were added pyridinium p-toluenesulfonate (0.143 g, 0.57 mmol, 0.05 equiv), (S)-(−)-2-methylpropane-2-sulfinamide (1.22 g, 10.07 mmol, 0.85 equiv), and magnesium sulfate (7.14 g, 59.32 mmol, 5.00 equiv). The resulting mixture was stirred overnight at room temperature. The reaction mixture was filtered and concentrated under reduced pressure. The resulting residue was purified by flash chromatography (silica gel, 30% EtOAc in petroleum ether) to provide 2.0 g (90%) of the title compound as a white solid. 1H NMR (400 MHz, CDCl3) δ ppm 8.08 (d, J=10.8 Hz, 1H), 3.36-3.32 (m, 1H), 2.25-2.16 (m, 4H), 2.03-1.90 (m, 2H), 1.15 (s, 9H).

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated under reduced pressure
3. customThe resulting residue was purified by flash chromatography (silica gel, 30% EtOAc in petroleum ether)