反应详情

To a stirred solution of methyl 2-(2-(N-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)sulfamoyl)-5-(2,2,2-trifluoroacetamido)phenyl)acetate (134 mg, 0.28 mmol) in 2 mL of MeOH and water (1:1, v/v) was added NaOH (34 mg, 0.85 mmol). The reaction mixture was stirred at room temperature for 16 hours. After MeOH was removed in vacuo, the residue was dissolved in water and acidified with 0.5N HCl. The mixture was extracted with ethyl acetate three times, and washed with water and brine. The organic layer was dried over Na2SO4, filtered and concentrated. The crude residue was purified by prep HPLC (SunFire Prep C18 OBD 5 uM 30×50 mm column) to give the title compound as an off-white solid (51 mg, yield 50%). MS calcd for (C15H15BN2O6S): 362.1. MS found (ESI negative): (M−H)−=361.1. 1H NMR (DMSO-d6) δ (ppm): 9.78 (s, 1H), 9.10 (bs, 1H), 7.41 (d, J=8.4 Hz, 1H), 7.35 (s, 1H), 7.14 (d, J=8.4 Hz, 1H), 7.04 (d, J=8.0 Hz, 1H), 6.34 (s, 1H), 6.32 (d, J=8.8 Hz, 1H), 4.79 (s, 2H), 3.73 (s, 2H).

1. customAfter MeOH was removed in vacuo
2. dissolutionthe residue was dissolved in water
3. extractionThe mixture was extracted with ethyl acetate three times
4. washwashed with water and brine
5. dry with materialThe organic layer was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe crude residue was purified by prep HPLC (SunFire Prep C18 OBD 5 uM 30×50 mm column)