p-Toluenesulfonic acid monohydrate → 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-5-formyl-N-(2-hydroxy-ethoxy)-benzamide

HRID 20722Notes

Reaction equation

HRID 20722 reaction equation
[Si]([O:8][CH2:9][CH2:10][O:11][NH:12][C:13](=[O:33])[C:14]1[CH:19]=[C:18]([CH:20]=[O:21])[C:17]([F:22])=[C:16]([F:23])[C:15]=1[NH:24][C:25]1[CH:30]=[CH:29][C:28]([I:31])=[CH:27][C:26]=1[F:32])(C(C)(C)C)(C)C.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>O1CCCC1.O>[F:23][C:16]1[C:15]([NH:24][C:25]2[CH:30]=[CH:29][C:28]([I:31])=[CH:27][C:26]=2[F:32])=[C:14]([CH:19]=[C:18]([CH:20]=[O:21])[C:17]=1[F:22])[C:13]([NH:12][O:11][CH2:10][CH2:9][OH:8])=[O:33]

Participants

5

Reactant 2

HCID 521998p-Toluenesulfonic acid monohydrateHCID 23132329N-[2-(t-butyldimethylsilanyloxy)-ethoxy]-3,4-difluoro-2-(2-fluoro-4-iodophenylamino)-5-formyl-benzamide

Product 1

HCID 231323883,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-5-formyl-N-(2-hydroxy-ethoxy)-benzamideYield 72%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

N-[2-(Tert-butyldimethylsilanyloxy)-ethoxy]-3,4-difluoro-2-(2-fluoro-4-iodophenylamino)-5-formyl-benzamide (37.1 g as a crude product containing the desilylated product) prepared in Step E was dissolved in a mixed solvent of tetrahydrofuran (200 ml) and water (16 ml). To this solution, p-toluenesulfonic acid monohydrate (1.76 g, 9.25 mmol) was added, and the mixture was stirred at room temperature for 12 hours. The reaction mixture was extracted with ethyl acetate, and the organic layer was washed with saturated brine, dried over magnesium sulfate, and evaporated under reduced pressure. The resultant residue was triturated with ethyl acetate to give 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-5-formyl-N-(2-hydroxy-ethoxy)-benzamide (16.0 g, 72% yield in two steps) as a yellow solid.

Workup

  1. customprepared in Step E
  2. extractionThe reaction mixture was extracted with ethyl acetate
  3. washthe organic layer was washed with saturated brine
  4. dry with materialdried over magnesium sulfate
  5. customevaporated under reduced pressure
  6. customThe resultant residue was triturated with ethyl acetate

Sources & evidence

ORD record
ord-f60fcdef413646d4a7fb6a02472236dd
Source dataset
uspto-grants-2010_06
Patent number
US07745663B2

Reaction notes

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