反应详情

To a stirred solution of 2-(5-amino-2-(N-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)sulfamoyl)phenyl)acetic acid (360 mg, 1 mmol) and n-propylamine (0.6 mL, 6 mmol) in 10 mL of DMF was added PyBOP (780 mg, 1.5 mmol) and TEA (0.5 mL, 3.56 mmol). The reaction mixture was stirred for 16 hours. After water was added, the reaction mixture was extracted with ethyl acetate and washed with water, 1N HCl and brine. The organic layer was dried over Na2SO4 and concentrated. The crude residue was purified by prep HPLC (SunFire Prep C18 OBD 5 uM 30×50 mm column) to give the desired product as a white powder (207 mg, yield 51%). MS calcd for (C18H22BN3O5S): 403.1. MS found (ESI negative): (M−H)−=402.1. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 9.89 (s, 1H), 9.17 (bs, 1H), 7.99 (t, J=5.6 Hz, 1H), 7.42 (m, 2H), 7.22 (d, J=8 Hz, 1H), 7.11 (dd, J=8, 2 Hz, 1H), 6.46 (d, J=2 Hz, 1H)), 6.35 (d, J=8.8, 2.4 Hz, 1H), 4.87 (s, 2H), 3.78 (s, 2H), 3.05 (m, 2H), 1.43 (m, 2H), 0.85 (t, J=7.2 Hz, 3H).

1. extractionthe reaction mixture was extracted with ethyl acetate
2. washwashed with water, 1N HCl and brine
3. dry with materialThe organic layer was dried over Na2SO4
4. concentrationconcentrated
5. customThe crude residue was purified by prep HPLC (SunFire Prep C18 OBD 5 uM 30×50 mm column)