反应详情

温度

55 °C

A mixture of tert-butyl 4-oxocyclohexylcarbamate (1.0 g, 4.7 mmol), 2-methylpropane-2-sulfinamide (0.63 g, 5.17 mmol) and Ti(OEt)4 (2.1 g, 9.2 mmol) in 10 mL of THF was stirred at 50-60° C. overnight. The mixture was cooled to room temperature and the residue purified by column chromatography (silica gel, 200-300 mesh, eluting with a mixture of petroleum ether and ethyl acetate (4:1, v/v) to give tert-butyl 4-(tert-butylsulfinylimino)cyclohexylcarbamate (1.0 g, 67%) as an clear oil. MS: (M+H)+=317.3; 1H NMR (300 MHz, CDCl3): δ 4.88-4.86 (m, 1H), 3.83 (brs, 1H), 3.39-3.38 (m, 1H), 2.62-2.15 (m, 5H), 1.68-1.53 (m, 2H), 1.43 (s, 9H), 1.24 (s, 9H).

1. temperatureThe mixture was cooled to room temperature
2. customthe residue purified by column chromatography (silica gel, 200-300 mesh
3. washeluting with a mixture of petroleum ether and ethyl acetate (4:1