Ammonium Chloride → 5-chloro-N-(2,4-dimethoxybenzyl)-2,4-difluoro-N-(1,3,4-thiadiazol-2-yl)benzenesulfonamide

HRID 1692278Notes

Reaction equation

HRID 1692278 reaction equation
[CH3:1][O:2][C:3]1[CH:15]=[C:14]([O:16][CH3:17])[CH:13]=[CH:12][C:4]=1[CH2:5][NH:6][C:7]1[S:8][CH:9]=[N:10][N:11]=1.C[Si](C)(C)[N-][Si](C)(C)C.[Li+].[Cl:28][C:29]1[C:30]([F:40])=[CH:31][C:32]([F:39])=[C:33]([S:35](Cl)(=[O:37])=[O:36])[CH:34]=1.[Cl-].[NH4+]>O1CCCC1>[Cl:28][C:29]1[C:30]([F:40])=[CH:31][C:32]([F:39])=[C:33]([S:35]([N:6]([CH2:5][C:4]2[CH:12]=[CH:13][C:14]([O:16][CH3:17])=[CH:15][C:3]=2[O:2][CH3:1])[C:7]2[S:8][CH:9]=[N:10][N:11]=2)(=[O:37])=[O:36])[CH:34]=1

Participants

6

Reactant 4

HCID 25517Ammonium ChlorideHCID 2733832Lithium HexamethyldisilazideHCID 27735275-Chloro-2,4-difluorobenzenesulphonyl chlorideHCID 58042278N-(2,4-dimethoxybenzyl)-1,3,4-thiadiazol-2-amine

Product 1

HCID 580422535-chloro-N-(2,4-dimethoxybenzyl)-2,4-difluoro-N-(1,3,4-thiadiazol-2-yl)benzenesulfonamideYield 73%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of N-(2,4-dimethoxybenzyl)-1,3,4-thiadiazol-2-amine (Preparation 248, 899 mg, 3.58 mmol) in tetrahydrofuran (6.0 mL), cooled to −78° C., was added lithium hexamethyldisilazide (1.0 M in tetrahydrofuran, 4.3 mL) dropwise. The reaction was stirred for 35 minutes at room temperature, cooled to −78° C. before the dropwise addition of 5-chloro-2,4-difluorobenzenesulfonyl chloride (850 mg, 0.0034 mol). The reaction mixture was stirred at −78° C. for 1 hour then at room temperature for 4 hours. The reaction mixture was poured into saturated aqueous ammonium chloride solution and extracted with dichloromethane. The combined organic layers were washed with saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by automated flash chromatography eluting with ethyl acetate:hexanes (gradient 0:1 to 1:0, by volume) to afford the title compound as a white solid, 1.16 g, 73% yield.

Workup

  1. stirringThe reaction mixture was stirred at −78° C. for 1 hour
  2. waitat room temperature for 4 hours
  3. extractionextracted with dichloromethane
  4. washThe combined organic layers were washed with saturated aqueous sodium chloride solution
  5. dry with materialdried over magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by automated flash chromatography
  9. washeluting with ethyl acetate

Sources & evidence

ORD record
ord-fd0de9935f21423c806cb634433c98ed
Source dataset
uspto-grants-2012_04
Patent number
US08153814B2

Reaction notes

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