Toluene → 2-Ethyl 4'-methyl 2'-methyl-biphenyl-2,4'-dicarboxylate

HRID 1799020Notes

Reaction equation

HRID 1799020 reaction equation
Br[C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[CH:4][C:3]=1[CH3:12].CC1(C)C(C)(C)OB([C:21]2[CH:31]=[CH:30][CH:29]=[CH:28][C:22]=2[C:23]([O:25][CH2:26][CH3:27])=[O:24])O1.C1(C)C=CC=CC=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>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.O>[CH3:12][C:3]1[CH:4]=[C:5]([C:6]([O:8][CH3:9])=[O:7])[CH:10]=[CH:11][C:2]=1[C:21]1[C:22]([C:23]([O:25][CH2:26][CH3:27])=[O:24])=[CH:28][CH:29]=[CH:30][CH:31]=1

Participants

7

Reactant 4

HCID 1140TolueneHCID 62657Potassium Phosphate, TribasicHCID 2773962Ethyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoateHCID 3294148Methyl 4-bromo-3-methylbenzoate

Product 1

HCID 594926732-Ethyl 4'-methyl 2'-methyl-biphenyl-2,4'-dicarboxylateYield 81%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Procedure

Under a nitrogen atmosphere, to a mixture of methyl 4-bromo-3-methylbenzoate (2.291 g), ethyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (3.313 g), toluene (20 ml), water (10 ml) and tripotassium phosphate (4.246 g) was added tetrakis(triphenylphosphine)palladium(0) (0.578 g) at room temperature, and the mixture was stirred with heating under reflux overnight. The reaction mixture was cooled to room temperature, and partitioned in a separatory funnel. The organic layer was successively washed with water and saturated brine, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure and the obtained residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=95/5) to give the title compound (2.404 g, 81%)

Workup

  1. temperaturewith heating
  2. temperatureunder reflux overnight
  3. custompartitioned in a separatory funnel
  4. washThe organic layer was successively washed with water and saturated brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated under reduced pressure
  8. customthe obtained residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=95/5)

Sources & evidence

ORD record
ord-37842637fd33453ba827cb609473543c
Source dataset
uspto-grants-2013_01
Patent number
US08343994B2

Reaction notes

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