反应详情

Triethylamine (22.15 ml) was added to a solution of (2S)-2-(methoxycarbonyl)piperidine hydrochloride (10 g) [see Preparation 24] and cyclohexylmethanesulfonyl chloride (16.42 g) [King. J. F. et al,. J. Am. Chem. Soc., 1992, 114(5), 1743-9] in dichloromethane (100 ml). The reaction mixture was stirred for 18 hours after which time the solvent was removed under reduced pressure and the residue diluted with ethyl acetate. The organic layer was washed with water, brine, dried over magnesium sulphate and the solvent was removed under reduced pressure. The crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 95:5 changing to 80:20, by volume, hexane:ethyl acetate to afford methyl (2S)-1-[(cyclohexylmethyl)sulfonyl]-2-piperidinecarboxylate (11.9 g) as a white solid.

1. customwas removed under reduced pressure
2. additionthe residue diluted with ethyl acetate
3. washThe organic layer was washed with water, brine
4. dry with materialdried over magnesium sulphate
5. customthe solvent was removed under reduced pressure
6. customThe crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 95:5 changing to 80:20, by volume, hexane