Sodium Carbonate → 5-(2-Methoxy-3-nitro-phenyl)furan-2-carboxylic acid

HRID 384318Notes

Reaction equation

HRID 384318 reaction equation
[CH3:1][O:2][C:3]1[C:8]([N+:9]([O-:11])=[O:10])=[CH:7][CH:6]=[CH:5][C:4]=1B1OC(C)(C)C(C)(C)O1.Br[C:22]1[O:26][C:25]([C:27]([OH:29])=[O:28])=[CH:24][CH:23]=1.C(=O)([O-])[O-].[Na+].[Na+]>O1CCOCC1.O.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>[CH3:1][O:2][C:3]1[C:8]([N+:9]([O-:11])=[O:10])=[CH:7][CH:6]=[CH:5][C:4]=1[C:22]1[O:26][C:25]([C:27]([OH:29])=[O:28])=[CH:24][CH:23]=1

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 685115-Bromo-2-furanecarboxylic acidHCID 574838002-(2-Methoxy-3-nitrophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

Product 1

HCID 574838035-(2-Methoxy-3-nitro-phenyl)furan-2-carboxylic acidYield 56.1%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Procedure

2-(2-Methoxy-3-nitro-phenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane 6a (10 g, 35.85 mmol), 5-bromofuran-2-carboxylic acid (5.47 g, 28.66 mmol), tetrakis(triphenylphosphine)palladium (2.07 g, 1.79 mmol) and sodium carbonate (7.60 g, 71.66 mmol) were dissolved in the solvent mixture of 200 mL of 1,4-dioxane and 30 mL of water. The reaction mixture was heated to reflux for 2.5 hours. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was diluted with 150 mL of water and adjusted to pH 3 with 1 N hydrochloric acid. Then the mixture was filtered and the filter cake was washed with 50 mL of the solvent mixture of n-hexane/ethyl acetate (V/V=1:1). The residue was dried to obtain the title compound 5-(2-methoxy-3-nitro-phenyl)furan-2-carboxylic acid 9a (4.23 g, yield 56.1%) as a grey solid.

Workup

  1. temperatureThe reaction mixture was heated
  2. temperatureto reflux for 2.5 hours
  3. filtrationThe mixture was filtered
  4. concentrationthe filtrate was concentrated under reduced pressure
  5. additionThe residue was diluted with 150 mL of water
  6. filtrationThen the mixture was filtered
  7. washthe filter cake was washed with 50 mL of the solvent mixture of n-hexane/ethyl acetate (V/V=1:1)
  8. customThe residue was dried

Sources & evidence

ORD record
ord-6f3c6abdba2b4fcfa4c4696a885c147b
Source dataset
uspto-grants-2013_02
Patent number
US08367710B2

Reaction notes

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