反应详情

At 0° C. to a solution of 0.62 g (5.9 mmol) of methyl beta-hydroxypropionate in 4.5 mL of CH2Cl2 was added 1.4 mL (6.4 mmol, 2.4 eq) of 2,6-di-tert-butylpyridine, followed by 1.03 mL (6.2 mmol, 2.4 eq) of trifluoromethane sulfonic acid anhydride. The solution was stirred at that temperature for 2.5 h, was concentrated, and the residue was dissolved in 5 mL of nitromethane. To this solution 1 g (2.96 mmol) of trans-N-(4-hydroxy-cyclohexyl)-N-methyl-4-trifluoromethyl-benzenesulfonamide and 1.3 mL (5.9 mmol, 2.0 eq) of 2,6-di-tert-butylpyridine in 10 mL of nitromethane were added. The solution was stirred at 60° C. for 3 h, diluted with EtOAc and 1M KHSO4. The inorganic phase was extracted with EtOAc, the combined organic phases were washed with a saturated aqueous solution of NaHCO3, brine and were dried over Na2SO4 and evaporated. Column chromatography on silica gel with EtOAc/n-hexane 1:3 gave 1.2 g (95%) of trans-3-{4-[methyl-(4-trifluoromethyl-benzenesulfonyl)-amino]-cyclohexyloxy}-propionic acid methyl ester as light yellow oil, MS: 424 (MH+).

1. concentrationwas concentrated
2. dissolutionthe residue was dissolved in 5 mL of nitromethane
3. stirringThe solution was stirred at 60° C. for 3 h
4. extractionThe inorganic phase was extracted with EtOAc
5. washthe combined organic phases were washed with a saturated aqueous solution of NaHCO3, brine
6. dry with materialwere dried over Na2SO4
7. customevaporated