反应详情

温度

0 °C

A solution of cis (4-hydroxy-cyclohexyl)-carbamic acid tert-butyl ester (1.00 g, 4.70 mmol) in DCM (10 mL) was treated with triethylamine (1.29 mL, 9.30 mmol) and the mixture was cooled to 0° C. Methanesulfonyl chloride (0.54 mL, 7.00 mmol) was added dropwise and the mixture was stirred at 0° C. for 15 minutes. Water was added and the phases were separated. The aqueous phase was extracted with DCM (×2) and the combined organic phase was washed with saturated sodium hydrogen carbonate solution, and brine, dried with sodium sulfate and concentrated under vacuum to give 1.39 g (quant) of Cis methanesulfonic acid 4 tert-butoxycarbonylamino-cyclohexyl ester as a peach coloured solid which was used without further purification. 1H NMR (400 MHz, CDCl3) δ: 4.89 (m, 1H), 4.46 (br s, 1H), 3.53 (br s, 1H), 3.01 (s, 3H), 2.05 (m, 2H), 1.84-(m, 2H), 1.73 (m, 2H), 1.58 (m, 2H), 1.45 (s, 9H).

1. customthe phases were separated
2. extractionThe aqueous phase was extracted with DCM (×2)
3. washthe combined organic phase was washed with saturated sodium hydrogen carbonate solution, and brine
4. dry with materialdried with sodium sulfate
5. concentrationconcentrated under vacuum