Lithium Chloride → 2-Fluoro-4-[5-[4-(1,3-thiazol-4-yl)-3-(trifluoromethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide

HRID 497278Notes

Reaction equation

HRID 497278 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([N:8]2[C:12]([C:13]3[CH:18]=[CH:17][C:16](Br)=[C:15]([C:20]([F:23])([F:22])[F:21])[CH:14]=3)=[CH:11][C:10]([C:24]([F:27])([F:26])[F:25])=[N:9]2)[CH:5]=[CH:4][C:3]=1[S:28]([NH2:31])(=[O:30])=[O:29].C([Sn](CCCC)(CCCC)[C:37]1[N:38]=[CH:39][S:40][CH:41]=1)CCC.[Cl-].[Li+]>O1CCOCC1.C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[F:1][C:2]1[CH:7]=[C:6]([N:8]2[C:12]([C:13]3[CH:18]=[CH:17][C:16]([C:37]4[N:38]=[CH:39][S:40][CH:41]=4)=[C:15]([C:20]([F:23])([F:22])[F:21])[CH:14]=3)=[CH:11][C:10]([C:24]([F:27])([F:26])[F:25])=[N:9]2)[CH:5]=[CH:4][C:3]=1[S:28]([NH2:31])(=[O:30])=[O:29]

Participants

7

Reactant 3

HCID 433294Lithium ChlorideHCID 27632584-(Tri-n-butylstannyl)thiazoleHCID 22316629HCID 22316629, compound

Product 1

HCID 223169742-Fluoro-4-[5-[4-(1,3-thiazol-4-yl)-3-(trifluoromethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamideYield 18%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Procedure

To a stirred solution of 2-fluoro-4-[5-[4-bromo-3-(trifluoromethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide (308 mg, 0.58 mmol) in dioxane (5 ml) was added 4-(tributylstannyl)thiazole (260 mg, 0.70 mmol), tetrakis(triphenylphosphine)palladium (67 mg, 0.058 mmol), lithium chloride (61 mg, 1.45 mmol), and the mixture was heated at reflux temperature for 16 hours. The reaction mixture was cooled down to room temperature, and diluted with ethyl acetate. The whole was washed with saturated potassium fluoride aqueous solution, and the precipitate was removed by filteration through celite. The resulting solution was extracted with ethyl acetate. The organic layer was washed with brine, dried over MgSO4, and concentrated in vacuo. The residue was purified by flash chromatography eluting with ethyl acetate-hexane (1:2) to give title compound (56 mg, 18% yield).

Workup

  1. temperaturethe mixture was heated
  2. temperatureat reflux temperature for 16 hours
  3. washThe whole was washed with saturated potassium fluoride aqueous solution
  4. customthe precipitate was removed by filteration through celite
  5. extractionThe resulting solution was extracted with ethyl acetate
  6. washThe organic layer was washed with brine
  7. dry with materialdried over MgSO4
  8. concentrationconcentrated in vacuo
  9. customThe residue was purified by flash chromatography
  10. washeluting with ethyl acetate-hexane (1:2)

Sources & evidence

ORD record
ord-31d2c4d51de14190b4b770bdc6394067
Source dataset
uspto-grants-2005_09
Patent number
US06949536B2

Reaction notes

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