Lithium Chloride → 5-{4-Chloro-5-[4-(1,3-thiazol-4-yl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl}-2-pyridinesulfonamide

HRID 394862Notes

Reaction equation

HRID 394862 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:12]([C:13]3[CH:14]=[CH:15][C:16]([S:19]([NH2:22])(=[O:21])=[O:20])=[N:17][CH:18]=3)[N:11]=[C:10]([C:23]([F:26])([F:25])[F:24])[C:9]=2[Cl:27])=[CH:4][CH:3]=1.C([Sn](CCCC)(CCCC)[C:33]1[N:34]=[CH:35][S:36][CH:37]=1)CCC.[Cl-].[Li+]>O1CCOCC1>[Cl:27][C:9]1[C:10]([C:23]([F:26])([F:25])[F:24])=[N:11][N:12]([C:13]2[CH:14]=[CH:15][C:16]([S:19]([NH2:22])(=[O:21])=[O:20])=[N:17][CH:18]=2)[C:8]=1[C:5]1[CH:6]=[CH:7][C:2]([C:33]2[N:34]=[CH:35][S:36][CH:37]=2)=[CH:3][CH:4]=1

Participants

5

Reactant 3

HCID 433294Lithium ChlorideHCID 27632584-(Tri-n-butylstannyl)thiazoleHCID 223138055-[5-(4-bromophenyl)-4-chloro-3-(trifluoromethyl)-1H-pyrazol-1-yl]-2-pyridinesulfonamide

Product 1

HCID 120965915-{4-Chloro-5-[4-(1,3-thiazol-4-yl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl}-2-pyridinesulfonamideYield 84.2%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

A mixture of 5-[5-(4-bromophenyl)-4-chloro-3-(trifluoromethyl)-1H-pyrazol-1-yl]-2-pyridinesulfonamide (236 mg, 0.489 mmol), 4-(tributylstannyl)-1,3-thiazole 238 mg, 0.636 mmol), lithium chloride (27 mg, 0.636 mmol) and tetrakis(triphenyphosphine)palladium (57 mg, 0.0489 mmol) in 1,4-dioxane (10 ml) was refluxed for 5 hr under nitrogen atmosphere. After evaporation, the residue obtained was chromatographed on a column of silica gel (50 g) eluting with ethyl acetate/hexane (3:4) to afford 200 mg (84%) of the title compound as a pale brown gum.

Workup

  1. temperaturewas refluxed for 5 hr under nitrogen atmosphere
  2. customAfter evaporation
  3. customthe residue obtained
  4. customwas chromatographed on a column of silica gel (50 g)
  5. washeluting with ethyl acetate/hexane (3:4)

Sources & evidence

ORD record
ord-6ef4f379d230408c9aa5f4b50378ac69
Source dataset
uspto-grants-2003_08
Patent number
US06603008B1

Reaction notes

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