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Dimethylformamide → ethyl 1-[4-(2-phenyl-4-oxazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylate

HRID 350325
Notes
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Reaction equation

HRID 350325 reaction equation
[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6]1[C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:9][NH:8][N:7]=1.Cl[CH2:17][C:18]1[CH:36]=[CH:35][C:21]([O:22][CH2:23][C:24]2[N:25]=[C:26]([C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=3)[O:27][CH:28]=2)=[CH:20][CH:19]=1.C(=O)([O-])[O-].[K+].[K+].CN(C)C=O>O>[C:29]1([C:26]2[O:27][CH:28]=[C:24]([CH2:23][O:22][C:21]3[CH:20]=[CH:19][C:18]([CH2:17][N:8]4[CH:9]=[C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])[C:6]([C:2]5[S:1][CH:5]=[CH:4][CH:3]=5)=[N:7]4)=[CH:36][CH:35]=3)[N:25]=2)[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 11430Potassium CarbonateHCID 230219114-(4-Chloromethylphenoxymethyl)-2-phenyloxazoleHCID 178469917HCID 178469917, compound

Product 1

HCID 23024977ethyl 1-[4-(2-phenyl-4-oxazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylateYield 92.3%

Reagents, catalysts & solvents

1
HCID 962WaterSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of ethyl 3-(2-thienyl)-1H-pyrazole-4-caboxylate (1.43 g), 4-(4-chloromethylphenoxy)methyl-2-phenyloxazole (1.88 g), potassium carbonate (1.30 g), and N,N-dimethylformamide (30 ml) was stirred at 80° C. for 8 hours. The reaction mixture was poured into water, and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), and concentrated. The residue was subjected to silica gel column chromatography to obtain ethyl 1-[4-(2-phenyl-4-oxazolylmethoxy)benzyl]-3-(2-thienyl)-1H-pyrazole-4-carboxylate as colorless crystals (2.81 g, yield: 92%) from the fraction eluted with ethyl acetate-hexane (1:2, volume ratio). This was recrystallized from ethyl acetate-hexane. Melting point: 114˜115° C.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-07d3ba35abea4aaa8e1df887fec58e87
Source dataset
uspto-grants-2007_02
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07179823B1

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes