Lithium Hydroxide → 5-fluoro-2-(1H-pyrazol-5-yl)benzoic acid

HRID 243878Notes

Reaction equation

HRID 243878 reaction equation
[F:1][C:2]1[CH:3]=[CH:4][C:5]([C:12]2[NH:16][N:15]=[CH:14][CH:13]=2)=[C:6]([CH:11]=1)[C:7]([O:9]C)=[O:8].[Li+].[OH-]>CCO>[F:1][C:2]1[CH:3]=[CH:4][C:5]([C:12]2[NH:16][N:15]=[CH:14][CH:13]=2)=[C:6]([CH:11]=1)[C:7]([OH:9])=[O:8]

Participants

4

Reactant 2

HCID 3939Lithium HydroxideHCID 67086678methyl 5-fluoro-2-(1H-pyrazol-5-yl)benzoate

Product 1

HCID 670868915-fluoro-2-(1H-pyrazol-5-yl)benzoic acidYield 44%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A solution of methyl 5-fluoro-2-(1H-pyrazol-5-yl)benzoate (415 mg, 1.9 mmol) in EtOH (10 mL) was treated with 4.0 eq of LiOH and stirred and monitored for two hours the reaction was complete. Reaction was made to pH=5, and then the solution concentrated under reduced pressure during which time a ppt formed. The reactions was then concentrated to minimum volume and cooled in ice, then filtered and washed with ice water to give 5-fluoro-2-(1H-pyrazol-5-yl)benzoic acid (172 mg, 44% yield). 1H NMR (400 MHz, DMSO-d6): 13.03 (s, 1H), 7.71 (d, J=2.0 Hz, 1H), 7.67 (dd, J=8.3, 5.6 Hz, 1H), 7.37 (td, J=8.6, 2.9 Hz, 2H), 6.44 (d, J=2.2 Hz, 1H).

Workup

  1. customReaction
  2. concentrationthe solution concentrated under reduced pressure during which time a ppt
  3. customformed
  4. concentrationThe reactions was then concentrated to minimum volume
  5. temperaturecooled in ice
  6. filtrationfiltered
  7. washwashed with ice water

Sources & evidence

ORD record
ord-8c98a29f313640e1a7ab7b74d102ce23
Source dataset
uspto-grants-2014_02
Patent number
US08653263B2

Reaction notes

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