Sodium Hydroxide → 2-Bromo-[1,2,4]triazolo[1,5-a]pyridine-7-carboxylic acid
Reaction equation
[OH-].[Na+].[Br:3][C:4]1[N:16]=[C:7]2[CH:8]=[C:9]([C:12]([O:14]C)=[O:13])[CH:10]=[CH:11][N:6]2[N:5]=1>CO>[Br:3][C:4]1[N:16]=[C:7]2[CH:8]=[C:9]([C:12]([OH:14])=[O:13])[CH:10]=[CH:11][N:6]2[N:5]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A 1 N sodium hydroxide aqueous solution (150 ml) was added to a methanol (150 ml) suspension of the methyl 2-bromo-[1,2,4]triazolo[1,5-a]pyridine-7-carboxylate (10 g) obtained in (Example 3.15) <Step 2>, and the obtained mixture was then stirred for 30 minutes. Thereafter, about half of the solvent was distilled away under reduced pressure, and the residue was then adjusted to pH 4 by addition of 3 N hydrochloric acid (50 ml). The precipitated solid was collected by filtration, and was then successively washed with water (50 ml) and methyl tert-butyl ether (20 ml). The obtained solid was subjected to azeotropy with toluene to obtain the title compound (9.0 g) in the form of a white solid.