Trifluoroacetic acid → 1-[[5-(4-fluorophenyl)-4-(4-pyridinyl)-1H-pyrazol-3-yl]carbonyl]piperazine, monohydrate

HRID 489953Notes

Reaction equation

HRID 489953 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:12][N:11]=[C:10]([C:13]([N:15]3[CH2:20][CH2:19][N:18](C(OC(C)(C)C)=O)[CH2:17][CH2:16]3)=[O:14])[C:9]=2[C:28]2[CH:33]=[CH:32][N:31]=[CH:30][CH:29]=2)=[CH:4][CH:3]=1.C(O)(C(F)(F)F)=[O:35]>C(Cl)Cl>[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:12][N:11]=[C:10]([C:13]([N:15]3[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]3)=[O:14])[C:9]=2[C:28]2[CH:29]=[CH:30][N:31]=[CH:32][CH:33]=2)=[CH:4][CH:3]=1.[OH2:35].[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[NH:12][N:11]=[C:10]([C:13]([N:15]3[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]3)=[O:14])[C:9]=2[C:28]2[CH:29]=[CH:30][N:31]=[CH:32][CH:33]=2)=[CH:4][CH:3]=1

Participants

5

Reactant 2

HCID 6422Trifluoroacetic acidHCID 178452358HCID 178452358, compound

Product 2

HCID 1785200611-[[5-(4-fluorophenyl)-4-(4-pyridinyl)-1H-pyrazol-3-yl]carbonyl]piperazineHCID 1785269461-[[5-(4-fluorophenyl)-4-(4-pyridinyl)-1H-pyrazol-3-yl]carbonyl]piperazine, monohydrateYield 96.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of 1,1-dimethylethyl 4-[[5-(4fluorophenyl)-4-(4-pyridinyl)-1H-pyrazol-3-yl]carbonyl]-1-piperazinecarboxylate (0.6349 g; 1.4077 mmol; prepared as set forth in step 2 of Example A-313) in methylene chloride (3.5 mL) and TFA (1.1 mL, 14.077 mmol) was stirred at room temperature under N2 for 2 hours. The solvents were removed under reduced pressure, and TFA was chased by methylene chloride and methanol. The resulting colorless oily residue was triturated with methanol. The resulting solid was collected by filtration and dried in a vacuum oven overnight to give the desired product 1-[[5-(4-fluorophenyl)-4-(4-pyridinyl)-1H-pyrazol-3-yl]carbonyl]piperazine, monohydrate (0.7860 g, 96.4%). Anal. Calc'd for C19H18N5OF.2TFA.H2O: C, 46.24; H, 3.71; N, 11.72; Found: C, 45.87; H, 3.43; N, 11.45. MS (MH+): 352 (base peak).

Workup

  1. customprepared
  2. customThe solvents were removed under reduced pressure, and TFA
  3. customThe resulting colorless oily residue was triturated with methanol
  4. filtrationThe resulting solid was collected by filtration
  5. customdried in a vacuum oven overnight

Sources & evidence

ORD record
ord-34f580c185434511820ee9c5e17c6d74
Source dataset
uspto-grants-2005_12
Patent number
US06979686B1

Reaction notes

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