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Hydrochloric Acid → 7-Trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyridine-3-carboxylic acid

HRID 269039
Notes
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Reaction equation

HRID 269039 reaction equation
C([O:3][C:4]([C:6]1[CH:7]=[N:8][N:9]2[C:14]([C:15]([F:18])([F:17])[F:16])=[CH:13][C:12]([C:19]3[CH:24]=[CH:23][C:22]([C:25]([F:28])([F:27])[F:26])=[CH:21][CH:20]=3)=[CH:11][C:10]=12)=[O:5])C.O[Li].O.Cl>C1COCC1.CO.O>[F:18][C:15]([F:16])([F:17])[C:14]1[N:9]2[N:8]=[CH:7][C:6]([C:4]([OH:5])=[O:3])=[C:10]2[CH:11]=[C:12]([C:19]2[CH:20]=[CH:21][C:22]([C:25]([F:26])([F:27])[F:28])=[CH:23][CH:24]=2)[CH:13]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 866080137-Trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyridine-3-carboxylic acid ethyl ester

Product 1

HCID 866080157-Trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyridine-3-carboxylic acidYield 96.2%

Reagents, catalysts & solvents 3

HCID 887
Methanol
Solvent
HCID 962WaterSolvent
HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
23 °C

Procedure

To a solution of 7-trifluoromethyl-5-(4-trifluoromethyl-phenyl)-pyrazolo[1,5-a]pyridine-3-carboxylic acid ethyl ester (example C.22 step 7) (1.21 g, 3.0 mmol) in THF (15 mL), MeOH (1.8 mL) and H2O (4.8 mL) was added LiOH.H2O (0.3.8 g, 9.0 mmol) and the reaction mixture was stirred at 23° C. for 18 h. Poured into ice water, adjusted with 1 N HCl to pH 2-3, filtered the precipitate off, washed with H2O and dried at HV to give the title compound as an off-white solid (1.08 g, 96%). MS (ISN) 373 [(M−H)−]; mp >250° C.

Workup

  1. filtrationfiltered the precipitate off,
  2. washwashed with H2O
  3. customdried at HV

Sources & evidence

ORD record
ord-86b068f29c9c4c95a9f3c25a0bacd4b1
Source dataset
uspto-grants-2008_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07446113B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes