Lithium Hydroxide → 8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid
反応式
[F:1][C:2]1[CH:25]=[CH:24][CH:23]=[C:22]([F:26])[C:3]=1[CH2:4][O:5][C:6]1[C:7]2[N:8]([C:13]([C:17]([O:19]CC)=[O:18])=[C:14]([CH3:16])[N:15]=2)[CH:9]=[C:10]([CH3:12])[CH:11]=1.[OH-].[Li+]>C1COCC1.CO>[F:1][C:2]1[CH:25]=[CH:24][CH:23]=[C:22]([F:26])[C:3]=1[CH2:4][O:5][C:6]1[C:7]2[N:8]([C:13]([C:17]([OH:19])=[O:18])=[C:14]([CH3:16])[N:15]=2)[CH:9]=[C:10]([CH3:12])[CH:11]=1参加物
4
実験手順
220 mg of ethyl 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate (Example 23A; 0.524 mmol, 1 equivalent) were dissolved in 7 ml of THF/methanol 1:1, 2.6 ml of 1 N aqueous lithium hydroxide solution (2.6 mmol, 5 equivalents) were added and the mixture was stirred at RT for 16 h. The mixture was concentrated under reduced pressure and the residue was acidified with 1N hydrochloric acid. The solid was triturated, filtered off, washed with water and dried under reduced pressure. This gave 120 mg of the title compound (60% of theory).