[Cl:1][C:2]1[C:28]([Cl:29])=[CH:27][CH:26]=[CH:25][C:3]=1[CH2:4][N:5]1[C:9]2=[N:10][C:11]([N:18]3[CH2:23][CH2:22][O:21][CH2:20][CH2:19]3)=[CH:12][C:13]([C:14]([O:16]C)=[O:15])=[C:8]2[N:7]=[C:6]1[CH3:24]>[Li+].[OH-].C1COCC1>[Cl:1][C:2]1[C:28]([Cl:29])=[CH:27][CH:26]=[CH:25][C:3]=1[CH2:4][N:5]1[C:9]2=[N:10][C:11]([N:18]3[CH2:23][CH2:22][O:21][CH2:20][CH2:19]3)=[CH:12][C:13]([C:14]([OH:16])=[O:15])=[C:8]2[N:7]=[C:6]1[CH3:24]A mixture of methyl 3-(2,3-dichlorobenzyl)-2-methyl-5-morpholino-3H-imidazo[4,5-b]pyridine-7-carboxylate (239 mg, 0.55 mmol) in 2N LiOH (15 mL) and THF (15 mL) was stirred at 60° C. for 5 h. It was cooled to room temperature and the precipitate was collected by filtration. It was then poured into water (50 mL) and the suspension was acidified with formic acid to pH=1. It was filtered and the solid was washed with water to afford the desired product as a gray solid (146 mg, 63%); LC/MS: MS (ES+) m/e 421 (MH+); 1H NMR (300 MHz, DMSO-d6) δ ppm 2.46 (s, 3H), 3.39 (t, J=4.8 Hz, 4H), 3.67 (t, J=4.8 Hz, 4H), 5.50 (s, 2H), 6.67 (d, J=4.5 Hz, 1H), 7.04 (s, 1H), 7.28 (t, J=7.5 Hz, 1H), 7.60 (d, J=4.5 Hz, 1H), 8.14 (s, 1H).
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