反应详情

To a solution of 2-{2-[5(4-fluoro-phenyl)-3-(2,4,6-trifluoro-benzoyl)-2,3-dihydro-[1,3,4]thiadiazol-2-yl]-phenoxymethyl}-furan-3-carboxylic acid methyl ester (0.49 mmol) in THF/MeOH/H2O (3:2:1), is added LiOH (3 N) (4.9 mmol). After stirring for 12 hours, the reaction is acidified with HCl (1 N) and extracted with ethyl acetate. The organic layer is dried over MgSO4, filtered, and concentrated. The residue is purified using preparative LC/MS to give 2-{2-[5(4-fluoro-phenyl)-3-(2,4,6-trifluoro-benzoyl)-2,3-dihydro [1,3,4]thiadiazol-2-yl]-phenoxymethyl}-furan-3-carboxylic acid as a white solid: 1H NMR (400 MHz, CDCl3) δ 7.26-7.23 (m, 3H), 7.20 (d, J=1.9, 1H), 7.10-7.05 (m, 1H), 7.03-6.99 (m, 1H), 6.86 (d, J=8.1, 1H), 6.78-6.74 (m, 3H), 6.55 (d, J=1.9, 1H), 6.55-6.50 (m, 2H), 5.38-5.21 (m, 2H); LC/MS (ES+): 557.1 (M+1)+.

1. extractionextracted with ethyl acetate
2. dry with materialThe organic layer is dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue is purified