Water → HCID 71280651, compound

HRID 570288Notes

Reaction equation

HRID 570288 reaction equation
[N:1]1[CH:2]=[C:3]([C:10]([NH:12][C:13]2[CH:14]=[C:15]([CH:19]=[CH:20][C:21]=2[CH3:22])[C:16]([O-:18])=[O:17])=[O:11])[N:4]2[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=12.[Li+].[OH-].O>C1COCC1.CO>[N:1]1[CH:2]=[C:3]([C:10]([NH:12][C:13]2[CH:14]=[C:15]([CH:19]=[CH:20][C:21]=2[CH3:22])[C:16]([OH:18])=[O:17])=[O:11])[N:4]2[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=12

Participants

6

Reactant 3

HCID 962WaterHCID 3939Lithium HydroxideHCID 86677440HCID 86677440, compound

Product 1

HCID 71280651HCID 71280651, compound

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a suspension of 3-(imidazo[1,2-a]pyridine-3-carboxamido)-4-methylbenzoate (3) (5.43 g, 17.6 mmol) in THF (225 ml) and MeOH (150 mL) was added LiOH 3 M (17.5 mL) and water (50 mL). The reaction was stirred at room temperature for 12 hours then reduced in volume on roto-vap to remove THF and MeOH. The mixture was diluted with water (75 mL) and neutralized with HCl (17.5 mL of a 3M solution). The resulting precipitate was filtered, washed with water and dried under vacuum to afford 3-(imidazo[1,2-a]pyridine-3-carboxamido)-4-methylbenzoic acid (4) as a white solid. 1H NMR (400 MHz, d6-DMSO) δ 10.0 (s, 1H), 9.45 (dt, J=6.8, 1.2 Hz, 1H), 8.58 (s, 1H), 7.98 (d, J=2.0 Hz, 1H), 7.79 (dt, J=9.2, 1.2 Hz, 1H), 7.76 (dd, J=8.0, 1.6 Hz, 1H), 7.52 (ddd, J=9.2, 9.2, 1.2 Hz, 1H), 7.43 (d, J=8.0 Hz, 1H), 7.17 (td, J=6.8, 1.2 Hz, 1H), 2.35 (s, 3H). MS m/z 296.1 (M+1)+.

Workup

  1. customto remove THF and MeOH
  2. additionThe mixture was diluted with water (75 mL)
  3. filtrationThe resulting precipitate was filtered
  4. washwashed with water
  5. customdried under vacuum

Sources & evidence

ORD record
ord-d51e8c29eb6b4620ba4e7aafe6ff8b12
Source dataset
uspto-grants-2015_05
Patent number
US09023839B2

Reaction notes

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