反应详情

cis-/trans-4-(1-tert-Butoxycarbonylamino-2-{[1-(4-chloro-phenyl)-cyclopropane-carbonyl]-amino}-ethyl)-cyclohexanecarboxylic acid propyl ester (1-9) (1.26 g, 0.00248 mol, 1 eq) was dissolved in THF (20 mL) and MeOH (10 mL) in a 250 mL RB flask LiOH (0.12 g, 0.00497 mol, 2 eq) in H2O (5 mL) was added to this solution. The reaction mixture was stirred at RT for 1 hour. NaOH (MW 40, 0.0075 mol, 3 eq) in H2O (5 mL) was added to the above reaction mixture. The reaction mixture was stirred at RT overnight. The reaction mixture was diluted with H2O. The pH was adjusted to 2˜3 with 5% HCl while cooling with an ice-H2O bath. THF and MeOH were removed under vacuum. The residue was extracted with EtOAc (3×80 mL). The combined EtOAc extracts were washed with brine (1×80 mL), dried over Na2SO4 and solvent evaporated to dryness. The crude product was purified on silica gel column, eluting with MeOH/CH2Cl2 (1.25˜10%) to afford 0.28 g plus 0.23 g (less pure) (46% yield) of 1-10. The 1H NMR (DMSO-d6) data is depicted in FIG. 7.

1. stirringThe reaction mixture was stirred at RT overnight
2. temperaturewhile cooling with an ice-H2O bath
3. customTHF and MeOH were removed under vacuum
4. extractionThe residue was extracted with EtOAc (3×80 mL)
5. washThe combined EtOAc extracts were washed with brine (1×80 mL)
6. dry with materialdried over Na2SO4 and solvent
7. customevaporated to dryness
8. customThe crude product was purified on silica gel column
9. washeluting with MeOH/CH2Cl2 (1.25˜10%)