反应详情

The ester from Step 1 (0.500 g, 1.20 mmol) was dissolved in a solution of THF:ethanol:water (7:2:1; 10 mL), treated with sodium hydroxide (0.48 mL, 1.20 mmol of a 2.5 N solution), and stirred at room temperature for 18 hours. The solvent was removed in vacuo and the residue was dissolved in water (10 mL). Diethyl ether (10 mL) was added and the mixture acidified with concentrated HCl. The organic layer was separated, and the aqueous phase was extracted with diethyl ether (2×10 mL). The combined extracts were dried over MgSO4, filtered, and evaporated to yield a white solid, which was recrystallized in diethyl ether-hexane to afford the title compound as a white solid (0.40 g, 86%): mp 205.5–207.3° C. 1H NMR (CDCl3/300 MHz) 7.81 (s, 1H), 7.42(s, 4H), 7.34 (d, 1H, J=2.4 Hz), 7.25 (s, 1H), 5.69 (q, 1H, J=6.8 Hz). FABLRMS m/z 387 (M−H) ESHRMS m/z 386.9788 (M−H, Calc'd. 386.980259). Anal. Calc'd. for C17H9Cl2F3O3: C, 52.47; H, 2.33; Cl, 18.22. Found: C, 52.38; H, 2.47; Cl, 18.20.

1. customThe solvent was removed in vacuo
2. dissolutionthe residue was dissolved in water (10 mL)
3. additionDiethyl ether (10 mL) was added
4. customThe organic layer was separated
5. extractionthe aqueous phase was extracted with diethyl ether (2×10 mL)
6. dry with materialThe combined extracts were dried over MgSO4
7. filtrationfiltered
8. customevaporated
9. customto yield a white solid, which
10. customwas recrystallized in diethyl ether-hexane