Thiophenol → (5-Methyl-2-(6-phenylsulfanyl-pyridin-3-yl)-oxazol-4-yl]-acetic acid methyl ester

HRID 860657

Reaction equation

HRID 860657 reaction equation
[CH3:1][O:2][C:3](=[O:18])[CH2:4][C:5]1[N:6]=[C:7]([C:11]2[CH:12]=[N:13][C:14](Cl)=[CH:15][CH:16]=2)[O:8][C:9]=1[CH3:10].[C:19]1([SH:25])[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C)C=O>[CH3:1][O:2][C:3](=[O:18])[CH2:4][C:5]1[N:6]=[C:7]([C:11]2[CH:12]=[N:13][C:14]([S:25][C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)=[CH:15][CH:16]=2)[O:8][C:9]=1[CH3:10]

Participants

5

Reactant 3

HCID 7969ThiophenolHCID 10796Cesium carbonateHCID 58765666[2-(6-Chloro-pyridin-3-yl)-5-methyl-oxazol-4-yl]-acetic acid methyl ester

Product 1

HCID 58765789(5-Methyl-2-(6-phenylsulfanyl-pyridin-3-yl)-oxazol-4-yl]-acetic acid methyl esterYield 74%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

[2-(6-Chloro-pyridin-3-yl)-5-methyl-oxazol-4-yl]-acetic acid methyl ester (4.8 g, 17.98 mmol) is dissolved in anhydrous dimethylformamide (100 mL) and allowed to stir under nitrogen. Benzenethiol (2.78 mL, 27 mmol) is added by syringe, followed by anhydrous cesium carbonate (12.6 g, 36 mmol). The mixture is allowed to stir under nitrogen 50° C. and monitored by HPLC. After complete consumption of strating material, the solution is quenched with 1N sodium hydroxide solution, diluted with ethyl acetate, and then enough water added to dissolve the solids. The two phases are separated and the organic layer is washed with water and brine, dried over anhydrous sodium sulfate, filtered, and concentrated. The pure (5-Methyl-2-(6-phenylsulfanyl-pyridin-3-yl)-oxazol-4-yl]-acetic acid methyl ester (4.51 g, 13.2 mmol) is isolated in 74% yield after column chromatography.

Workup

  1. stirringto stir under nitrogen 50° C.
  2. customAfter complete consumption of strating material
  3. customthe solution is quenched with 1N sodium hydroxide solution
  4. additiondiluted with ethyl acetate
  5. additionenough water added
  6. dissolutionto dissolve the solids
  7. customThe two phases are separated
  8. washthe organic layer is washed with water and brine
  9. dry with materialdried over anhydrous sodium sulfate
  10. filtrationfiltered
  11. concentrationconcentrated

Sources & evidence

ORD record
ord-f64c8bc0569f4427909726ece5df85a1
Source dataset
uspto-grants-2006_12
Patent number
US07153878B2

Linked notes

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