反应详情

420 mg (3.1 mmol) of 1-hydroxybenzotriazole and 600 mg (3.1 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride are added to a solution of 540 mg (3.1 mmol) of 4-but-2-ynyloxybenzoic acid in 10 ml of dimethylformamide. The reaction medium is stirred for 15 min at ambient temperature then 630 mg (2.8 mmol) of methyl (S)-3-amino-2-piperidin-1-yl-propanoate dihydrochloride in 10 ml of dimethylformamide and 0.8 ml (5.7 mmol) of triethylamine are added. The reaction medium is stirred at ambient temperature for 18 h. The organic phase is washed with an aqueous solution of sodium hydrogen carbonate then with a saturated aqueous solution of sodium chloride, dried over magnesium sulphate, filtered and concentrated. The crude product obtained is purified by chromatography over silica gel eluted with a 99/1 dichloromethane/methanol mixture. 580 mg (58%) of methyl (S)-3-(4-but-2-ynyloxybenzoylamino)-2-cyclohexylpropanoate are obtained in the form of a colourless oil.

1. stirringThe reaction medium is stirred at ambient temperature for 18 h
2. washThe organic phase is washed with an aqueous solution of sodium hydrogen carbonate
3. dry with materialwith a saturated aqueous solution of sodium chloride, dried over magnesium sulphate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude product obtained
7. customis purified by chromatography over silica gel
8. washeluted with a 99/1 dichloromethane/methanol mixture