Water → N-(2,4-difluoro-3-formylphenyl)propane-2-sulfonamide

HRID 249812Notes

Reaction equation

HRID 249812 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[NH:9][S:10]([CH:13]([CH3:15])[CH3:14])(=[O:12])=[O:11].C([Li])CCC.CN(C)[CH:23]=[O:24].O>O1CCCC1>[F:1][C:2]1[C:7]([CH:23]=[O:24])=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[NH:9][S:10]([CH:13]([CH3:15])[CH3:14])(=[O:12])=[O:11]

Participants

6

Reactant 4

HCID 962WaterHCID 6228DimethylformamideHCID 58087510N-(2,4-difluorophenyl)propane-2-sulfonamideHCID 178418339Butyllithium2×

Product 1

HCID 58086031N-(2,4-difluoro-3-formylphenyl)propane-2-sulfonamide

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To propane-2-sulfonic acid (2,4-difluoro-phenyl)-amide (48, 2.35 g, 9.95 mmol) in tetrahydrofuran (70 mL) under an atmosphere of nitrogen cooled with a dry ice/acetone bath was added 1.60 M of n-butyllithium (1.60 M in hexane, 6.53 mL, 10.45 mmol). The reaction was stirred for 40 minutes, and then another portion of n-butyllithium (1.60 M in hexane, 6.84 mL, 10.94 mmol). The reaction was stirred for 1 hour and N,N-dimethylformamide (0.92 mL, 11.9 mmol) was added. The reaction was allowed to warm to room temperature overnight. The reaction was poured into water extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and filtrated. The filtrate was concentrated and purified by silica gel column chromatography (dichloromethane/methanol 5%) to give the compound (49, 1.4 g, 53.4%). MS (ESI) [M−H+]−=263.4.

Workup

  1. stirringThe reaction was stirred for 1 hour
  2. extractionextracted with ethyl acetate
  3. washThe organic layer was washed with brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltrated
  6. concentrationThe filtrate was concentrated
  7. custompurified by silica gel column chromatography (dichloromethane/methanol 5%)
  8. customto give the compound (49, 1.4 g, 53.4%)

Sources & evidence

ORD record
ord-c1f97f95673c4719ae1ebc67ce5556b6
Source dataset
uspto-grants-2011_01
Patent number
US07863289B2

Reaction notes

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