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Water → 4-(3-phenyl-1,2,4-thiadiazol-5-yl)-N-pyridin-2-ylpiperazine-1-carboxamide

HRID 2262968
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Reaction equation

HRID 2262968 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[NH:7][C:8](=[O:15])OCC(Cl)(Cl)Cl.[C:16]1([C:22]2[N:26]=[C:25]([N:27]3[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]3)[S:24][N:23]=2)[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.C(N(C(C)C)CC)(C)C.O>CS(C)=O>[C:16]1([C:22]2[N:26]=[C:25]([N:27]3[CH2:32][CH2:31][N:30]([C:8]([NH:7][C:2]4[CH:3]=[CH:4][CH:5]=[CH:6][N:1]=4)=[O:15])[CH2:29][CH2:28]3)[S:24][N:23]=2)[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 962WaterHCID 81531DiisopropylethylamineHCID 27777601-(3-Phenyl-(1,2,4)thiadiazol-5-yl)-piperazineHCID 116876422,2,2-Trichloroethyl pyridin-2-ylcarbamate

Product 1

HCID 159792504-(3-phenyl-1,2,4-thiadiazol-5-yl)-N-pyridin-2-ylpiperazine-1-carboxamideYield 55.5%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

A mixed solution of 2,2,2-trichloroethyl pyridin-2-ylcarbamate (270 mg, 0.610 mmol), 1-(3-phenyl-1,2,4-thiadiazol-5-yl)piperazine (200 mg, 0.812 mmol) and diisopropylethylamine (0.129 ml, 0.738 mmol) in dimethyl sulfoxide (2.5 ml) was stirred at 70° C. for 3 hours. Water was poured to the reaction mixture, and the resulting solution was extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=3:7) and recrystallized from a mixed solvent of hexane and tetrahydrofuran to give 124 mg (55.4%) of the desired product as a solid.

Workup

  1. extractionthe resulting solution was extracted with ethyl acetate
  2. washThe extract was washed with water
  3. dry with materialdried over anhydrous magnesium sulfate
  4. distillationthe solvent was distilled off under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=3:7)
  6. customrecrystallized from a mixed solvent of hexane and tetrahydrofuran

Sources & evidence

ORD record
ord-6e135b2878b64f26aa56e56112a6bc80
Source dataset
uspto-grants-2010_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07851473B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes