Hydrochloric Acid → 6-Bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid

HRID 1844134Notes

Reaction equation

HRID 1844134 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([O:17][CH2:18][C:19]2[C:24]([F:25])=[CH:23][CH:22]=[CH:21][C:20]=2[F:26])[C:5]2[N:6]([C:8]([C:12]([O:14]CC)=[O:13])=[C:9]([CH3:11])[N:10]=2)[CH:7]=1.[OH-].[Li+].Cl>C1COCC1.CO>[Br:1][C:2]1[CH:3]=[C:4]([O:17][CH2:18][C:19]2[C:20]([F:26])=[CH:21][CH:22]=[CH:23][C:24]=2[F:25])[C:5]2[N:6]([C:8]([C:12]([OH:14])=[O:13])=[C:9]([CH3:11])[N:10]=2)[CH:7]=1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 3939Lithium HydroxideHCID 86717880Ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate

Product 1

HCID 867178816-Bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid

Reagents, catalysts & solvents 1

HCID 21899815MeOH tetrahydrofuranSolvent

Conditions

Temperature
40 °C

Procedure

1.5 g of ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 21A; 3.5 mmol, 1 equivalent) were dissolved in 72 ml of THF/methanol 5:1, 17.6 ml of 1N aqueous lithium hydroxide solution (17.6 mmol, 5 equivalents) were added and the mixture was warmed to 40° C. and stirred at this temperature for 6 h. Using 6 N aqueous hydrochloric acid, the mixture was then adjusted to pH 4 and concentrated. Water was added to the solid formed and the solid was triturated, filtered off, washed with water and dried under reduced pressure. This gave 1.24 g of the title compound (88% of theory).

Workup

  1. additionwere added
  2. concentrationconcentrated
  3. additionWater was added to the solid
  4. customformed
  5. customthe solid was triturated
  6. filtrationfiltered off
  7. washwashed with water
  8. customdried under reduced pressure

Sources & evidence

ORD record
ord-e67bb208fd034545b474ec6ff283f0d6
Source dataset
uspto-grants-2015_02
Patent number
US08946215B2

Reaction notes

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