[OH-].[Na+].C[O:4][C:5]([C:7]1[C:12]([Br:13])=[CH:11][N:10]2[CH:14]=[C:15]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[N:16]=[C:9]2[CH:8]=1)=[O:6].Cl>O.C(O)C>[Br:13][C:12]1[C:7]([C:5]([OH:6])=[O:4])=[CH:8][C:9]2[N:10]([CH:14]=[C:15]([C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[N:16]=2)[CH:11]=1NaOH (1N, 61 ml) was added to a suspension of 6-bromo-2-phenyl-imidazo[1,2-a]pyridine-7-carboxylic acid methyl ester (10.11 g, 31 mmol) in a mixture of water (30 ml) and ethanol (60 ml), and the mixture was heated to reflux (2 h). The mixture was cooled (0° C.) and HCl (conc., ˜10 ml) was slowly added. The dark brown suspension was filtered, washed with a small amount of ethanol, and dried under vacuum. The obtained title compound (9.47 g, 98%) was used in the next step without further purification. MS (m/e)=318.9 [M+H+].
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