Sodium Carbonate → Methyl 5-phenylfuran-2-carboxylate

HRID 1716984Notes

Reaction equation

HRID 1716984 reaction equation
Br[C:2]1[O:6][C:5]([C:7]([O:9][CH3:10])=[O:8])=[CH:4][CH:3]=1.[C:11]1(B(O)O)[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:10][O:9][C:7]([C:5]1[O:6][C:2]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)=[CH:3][CH:4]=1)=[O:8]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 66827Phenylboronic AcidHCID 599633Methyl 5-bromofuran-2-carboxylate

Product 1

HCID 11275689Methyl 5-phenylfuran-2-carboxylateYield 38%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent

Procedure

A mixture of methyl 5-bromofuroate (1 g, 5 mmoles), phenylboronic acid (1 g, 8.2 mmoles), tetrakis(triphenylphosphine)palladium(0) (0.2 g, 0.17 mmoles), sodium carbonate (1.5 g, 17.4 mmoles) in toluene (100 ml) was refluxed for 16 hours. After cooling, the solvent was evaporated and the yellow residue was partioned between water (50 ml) and ethyl acetate (50 ml). The aqueous layer was extracted with ethyl acetate (3×30 ml) and the combined organic layers washed with water (1×30 ml) and dried (MgSO4). The residue was purified by flash chromatography (20% ethyl acetate/70% cyclohexane and 10% diethyl ether/90% cyclohexane) to afford (7) (384 mg). This ester was used directly in the next step.

Workup

  1. temperaturewas refluxed for 16 hours
  2. temperatureAfter cooling
  3. customthe solvent was evaporated
  4. extractionThe aqueous layer was extracted with ethyl acetate (3×30 ml)
  5. washthe combined organic layers washed with water (1×30 ml)
  6. dry with materialdried (MgSO4)
  7. customThe residue was purified by flash chromatography (20% ethyl acetate/70% cyclohexane and 10% diethyl ether/90% cyclohexane)

Sources & evidence

ORD record
ord-006de3a1d0c445078826cb70890ad1d2
Source dataset
uspto-grants-2010_09
Patent number
US07803841B2

Reaction notes

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