Tetrahydrofuran → 5-Bromo-2-(2-chlorophenylamino)-3,4-difluorobenzoic acid methyl ester

HRID 1766776Notes

Reaction equation

HRID 1766776 reaction equation
[Br:1][C:2]1[C:3]([F:20])=[C:4]([F:19])[C:5]([NH:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[Cl:18])=[C:6]([CH:10]=1)[C:7]([OH:9])=[O:8].[CH2:21]1COCC1.C[Si](C=[N+]=[N-])(C)C>CO>[CH3:21][O:8][C:7](=[O:9])[C:6]1[CH:10]=[C:2]([Br:1])[C:3]([F:20])=[C:4]([F:19])[C:5]=1[NH:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[Cl:18]

Participants

5

Reactant 3

HCID 8028TetrahydrofuranHCID 167693TrimethylsilyldiazomethaneHCID 218669915-Bromo-2-(2-chlorophenylamino)-3,4-difluorobenzoic acid

Product 1

HCID 865967715-Bromo-2-(2-chlorophenylamino)-3,4-difluorobenzoic acid methyl esterYield 93%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of 5-bromo-2-(2-chlorophenylamino)-3,4-difluorobenzoic acid (3) (4.50 g, 12.4 mmol) in a 3:1 mixture of THF:MeOH (32 mL) was added (trimethylsilyl)-diazomethane (8.10 ml of a 2 M solution in hexanes) at room temperature. After stirring for 2 hours, the reaction mixture was quenched with acetic acid, diluted with EtOAc, and washed with water. The organic layer was dried (MgSO4) and concentrated under reduced pressure to give 4.35 g (93%) of the desired methyl ester (4).

Workup

  1. customthe reaction mixture was quenched with acetic acid
  2. additiondiluted with EtOAc
  3. washwashed with water
  4. dry with materialThe organic layer was dried (MgSO4)
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-ba165423e5814c66b6ecf7310b777f7d
Source dataset
uspto-grants-2007_06
Patent number
US07230099B2

Reaction notes

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