Dimethyl Sulfoxide → 5-chloro-N-(2,4-dimethoxybenzyl)-2-fluoro-4-[5-fluoro-2-pyridazin-4-yl-4-(trifluoromethyl)phenoxy]-N-1,3,4-thiadiazol-2-ylbenzenesulfonamide

HRID 1692233Notes

Reaction equation

HRID 1692233 reaction equation
[Cl:1][C:2]1[C:3](F)=[CH:4][C:5]([F:28])=[C:6]([S:8]([N:11]([CH2:17][C:18]2[CH:23]=[CH:22][C:21]([O:24][CH3:25])=[CH:20][C:19]=2[O:26][CH3:27])[C:12]2[S:13][CH:14]=[N:15][N:16]=2)(=[O:10])=[O:9])[CH:7]=1.[F:30][C:31]1[C:32]([C:44]([F:47])([F:46])[F:45])=[CH:33][C:34]([C:38]2[CH:43]=[CH:42][N:41]=[N:40][CH:39]=2)=[C:35]([OH:37])[CH:36]=1.C(=O)([O-])[O-].[K+].[K+].CS(C)=O>O.[Cl-].[NH4+]>[Cl:1][C:2]1[C:3]([O:37][C:35]2[CH:36]=[C:31]([F:30])[C:32]([C:44]([F:47])([F:45])[F:46])=[CH:33][C:34]=2[C:38]2[CH:43]=[CH:42][N:41]=[N:40][CH:39]=2)=[CH:4][C:5]([F:28])=[C:6]([S:8]([N:11]([CH2:17][C:18]2[CH:23]=[CH:22][C:21]([O:24][CH3:25])=[CH:20][C:19]=2[O:26][CH3:27])[C:12]2[S:13][CH:14]=[N:15][N:16]=2)(=[O:9])=[O:10])[CH:7]=1

Participants

7

Reactant 4

HCID 679Dimethyl SulfoxideHCID 11430Potassium CarbonateHCID 580422535-chloro-N-(2,4-dimethoxybenzyl)-2,4-difluoro-N-(1,3,4-thiadiazol-2-yl)benzenesulfonamideHCID 1360636295-Fluoro-2-pyridazin-4-yl-4-(trifluoromethyl)phenol

Product 1

HCID 866438255-chloro-N-(2,4-dimethoxybenzyl)-2-fluoro-4-[5-fluoro-2-pyridazin-4-yl-4-(trifluoromethyl)phenoxy]-N-1,3,4-thiadiazol-2-ylbenzenesulfonamideYield 23%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 25517Ammonium ChlorideSolvent

Procedure

5-Chloro-N-(2,4-dimethoxybenzyl)-2,4-difluoro-N-1,3,4-thiadiazol-2-ylbenzenesulfonamide (Preparation 247, 63 mg, 0.14 mmol) was added to a mixture of 5-fluoro-2-pyridazin-4-yl-4-(trifluoromethyl)phenol (Preparation 884, 35 mg, 0.14 mmol) and potassium carbonate (22 mg, 0.16 mmol) in dimethyl sulfoxide (2 mL, 30 mmol). The reaction mixture was stirred at ambient temperature. After 3 hours the reaction mixture was diluted with water and saturated aqueous ammonium chloride and extracted with ethyl acetate (3×). The combined organic layers were washed with water then brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was taken up in methylene chloride, concentrated onto diatomaceous earth, and purified by automated flash chromatography (12 g SiO2, hexanes to ethyl acetate) to afford the intermediate 5-chloro-N-(2,4-dimethoxybenzyl)-2-fluoro-4-[5-fluoro-2-pyridazin-4-yl-4-(trifluoromethyl)phenoxy]-N-1,3,4-thiadiazol-2-ylbenzenesulfonamide as a glass (22 mg, 23%).

Workup

  1. extractionextracted with ethyl acetate (3×)
  2. washThe combined organic layers were washed with water
  3. dry with materialbrine, dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. concentrationconcentrated onto diatomaceous earth
  7. custompurified by automated flash chromatography (12 g SiO2, hexanes to ethyl acetate)

Sources & evidence

ORD record
ord-54440a2f958a49019e4ab9401e0ff72c
Source dataset
uspto-grants-2012_04
Patent number
US08153814B2

Reaction notes

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