Hydrochloric Acid → 1-[(7-{[2,4-bis(trifluoromethyl)benzyl]oxy}-5-fluoro-2H-chromen-3-yl)methyl]-1H-pyrazole-4-carboxylic acid

HRID 217474Notes

Reaction equation

HRID 217474 reaction equation
[F:1][C:2]([F:38])([F:37])[C:3]1[CH:32]=[C:31]([C:33]([F:36])([F:35])[F:34])[CH:30]=[CH:29][C:4]=1[CH2:5][O:6][C:7]1[CH:16]=[C:15]2[C:10]([CH:11]=[C:12]([CH2:17][N:18]3[CH:22]=[C:21]([C:23]([O:25]CC)=[O:24])[CH:20]=[N:19]3)[CH2:13][O:14]2)=[C:9]([F:28])[CH:8]=1.[OH-].[Na+].Cl>CCO.C1COCC1>[F:38][C:2]([F:1])([F:37])[C:3]1[CH:32]=[C:31]([C:33]([F:34])([F:35])[F:36])[CH:30]=[CH:29][C:4]=1[CH2:5][O:6][C:7]1[CH:16]=[C:15]2[C:10]([CH:11]=[C:12]([CH2:17][N:18]3[CH:22]=[C:21]([C:23]([OH:25])=[O:24])[CH:20]=[N:19]3)[CH2:13][O:14]2)=[C:9]([F:28])[CH:8]=1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 86657650ethyl 1-[(7-{[2,4-bis(trifluoromethyl)benzyl]oxy}-5-fluoro-2H-chromen-3-yl)methyl]-1H-pyrazole-4-carboxylate

Product 1

HCID 866576561-[(7-{[2,4-bis(trifluoromethyl)benzyl]oxy}-5-fluoro-2H-chromen-3-yl)methyl]-1H-pyrazole-4-carboxylic acidYield 74.9%

Reagents, catalysts & solvents 1

HCID 21873804Tetrahydrofuran ethanolSolvent

Procedure

A solution of ethyl 1-[(7-{[2,4-bis(trifluoromethyl)benzyl]oxy}-5-fluoro-2H-chromen-3-yl)methyl]-1H-pyrazole-4-carboxylate (100 mg) and a 1 M aqueous NaOH solution (0.55 mL) in EtOH/THF (3 mL/1 mL) was stirred at 100° C. for 2 hours, neutralized with 1 M HCl, and extracted with chloroform. The organic layer was washed with brine, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=100:0 to 90:10) and the obtained solid was washed with IPE to obtain 1-[(7-{[2,4-bis(trifluoromethyl)benzyl]oxy}-5-fluoro-2H-chromen-3-yl)methyl]-1H-pyrazole-4-carboxylic acid (71 mg) as a white solid.

Workup

  1. extractionextracted with chloroform
  2. washThe organic layer was washed with brine
  3. dry with materialdried over MgSO4
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (chloroform:methanol=100:0 to 90:10)
  6. washthe obtained solid was washed with IPE

Sources & evidence

ORD record
ord-5a30d75f1b64458da5443869b1378b16
Source dataset
uspto-grants-2012_06
Patent number
US08193378B2

Reaction notes

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