Isobutylamine → HCID 67310372, compound

Participants

Reaction Steps

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 (720 mg, 2 mmol) and isobutylamine (1.2 mL, 12 mmol) in 20 mL of DMF was added PyBOP (1550 mg, 3 mmol) and TEA (1 mL, 7 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 ISCO CombiFlash Rf silica chromatography eluted with 88:10:2 chloroform:MeOH:H2O to give the desired product as a yellow solid (430 mg, yield 51%). MS calcd for (C19H24BN3O5S): 417.2. MS found (ESI negative): (M−H)−=416.1. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 9.89 (s, 1H), 9.17 (bs, 1H), 7.96 (t, J=5.6 Hz, 1H), 7.41 (m, 2H), 7.22 (d, J=8.4 Hz, 1H), 7.10 (d, J=8 Hz, 1H), 6.47 (s, 1H), 6.34 (d, J=8 Hz, 1H), 5.93 (bs, 2H), 4.87 (s, 2H), 3.80 (s, 2H), 2.93 (t, J=6.4 Hz 2H), 1.72 (m, 1H), 0.85 (d, J=7.8 Hz, 6H).

Provenance & Evidence