Citric Acid → 2-(4-(2-(1-isopropyl-3-methyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)-1H-pyrazol-1-yl)-2-methylpropanoic acid

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Reaction Steps

Ethyl 2-(4-(2-(1-isopropyl-3-methyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)-1H-pyrazol-1-yl)-2-methylpropanoate (750 mg, 0.0015 mol) was treated with 1 M of LiOH/H2O (1.6 mL) in MeOH (10 mL). The reaction was allowed to stirred at room temperature for 2 hours. The mixture was acidified by 10% citric acid aqueous solution was until PH=5, extracted with EtOAc twice, dried with MgSO4, and concentrated in vacuo. The crude was purified by Prep HPLC to provide 251. LC/MS (ESI+): m/z 462 (M+H). 1H NMR (500 MHz, DMSO) δ 8.44 (s, 1H), 8.36 (d, J=8.4, 1H), 7.97 (s, 1H), 7.86 (s, 1H), 7.44 (dd, J=8.4, 1.7, 1H), 7.35 (d, J=1.7, 1H), 5.82 (dt, J=13.1, 6.6, 1H), 4.52 (s, 3H), 2.25 (s, 2H), 1.78 (s, 4H), 1.45 (t, J=13.9, 4H)

Provenance & Evidence