Diethyl Ether → tert-Butyl 4-((4-chloro-5-(trifluoromethyl)pyrimidin-2-yl)amino)-1H-pyrazole-1-carboxylate

HRID 592459Notes

Reaction equation

HRID 592459 reaction equation
CCOCC.Cl[C:7]1[N:12]=[C:11]([Cl:13])[C:10]([C:14]([F:17])([F:16])[F:15])=[CH:9][N:8]=1.[NH2:18][C:19]1[CH:20]=[N:21][N:22]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH:23]=1.C(N(CC)CC)C>[Cl-].[Zn+2].[Cl-].ClCCCl.CC(O)(C)C>[Cl:13][C:11]1[C:10]([C:14]([F:17])([F:16])[F:15])=[CH:9][N:8]=[C:7]([NH:18][C:19]2[CH:20]=[N:21][N:22]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])[CH:23]=2)[N:12]=1

Participants

7

Reactant 4

HCID 3283Diethyl EtherHCID 8471TriethylamineHCID 27827742,4-Dichloro-5-(trifluoromethyl)pyrimidineHCID 59587648tert-butyl 4-amino-1H-pyrazole-1-carboxylate

Product 1

HCID 86712334tert-Butyl 4-((4-chloro-5-(trifluoromethyl)pyrimidin-2-yl)amino)-1H-pyrazole-1-carboxylate

Reagents, catalysts & solvents 2

HCID 3007855ZincchlorideCatalystHCID 21868497Tert-butyl alcohol 1,2-dichloroethaneSolvent2×

Procedure

A 1.0 M solution of zinc chloride in Et2O (4.0 mL, 4.0 mmol) was added to 2,4-dichloro-5-trifluoromethylpyrimidine (0.49 mL, 3.6 mmol) in a 1:1 mixture of DCE/t-BuOH (40 mL) at 0° C. under a nitrogen atmosphere. The mixture was stirred for 1 hour before tert-butyl 4-amino-1H-pyrazole-1-carboxylate (0.606 g, 3.31 mmol) and triethylamine (0.51 mL, 3.7 mmol) in a 1:1 mixture of DCE/t-BuOH (30 mL) was added. The mixture was allowed to warm to room temperature and stirred for 20 hours before concentrating in vacuo and adding gradually to 100 mL water. The resulting precipitate was removed by vacuum filtration and washed with DCM. The filtrate was purified using silica gel column chromatography (0-30% EtOAc in DCM) to give the title compound A61 (0.170 g, 14%). LCMS-D: rt 3.622 min; m/z 362.1 [M−H]−.

Workup

  1. additionwas added
  2. concentrationbefore concentrating in vacuo
  3. additionadding gradually to 100 mL water
  4. customThe resulting precipitate was removed by vacuum filtration
  5. washwashed with DCM
  6. customThe filtrate was purified

Sources & evidence

ORD record
ord-38986704d2844390b2810cd3a8b257d9
Source dataset
uspto-grants-2016_01
Patent number
US09238644B2

Reaction notes

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