Lithium Hydroxide → 8-[(2,6-Difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylic acid
Reaction equation
[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]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
220 mg of ethyl 8-[(2,6-difluorobenzyl)oxy]-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate (Example 20A; 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 reaction mixture was concentrated and the residue was acidified with 1N aqueous hydrochloric acid. The solid obtained was stirred, filtered off, washed with water and dried under reduced pressure. This gave 120 mg of the title compound (60% of theory).