Sodium Carbonate → 2-(3-Methoxyphenyl)-4,5-dimethoxybenzaldehyde

HRID 1860813Notes

Reaction equation

HRID 1860813 reaction equation
[CH3:1][O:2][C:3]1[C:10]([O:11][CH3:12])=[CH:9][C:6]([CH:7]=[O:8])=[C:5](Br)[CH:4]=1.C(=O)([O-])[O-].[Na+].[Na+].[CH3:20][O:21][C:22]1[CH:23]=[C:24](B(O)O)[CH:25]=[CH:26][CH:27]=1>C1(C)C=CC=CC=1.C(O)C.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>[CH3:20][O:21][C:22]1[CH:27]=[C:26]([C:5]2[CH:4]=[C:3]([O:2][CH3:1])[C:10]([O:11][CH3:12])=[CH:9][C:6]=2[CH:7]=[O:8])[CH:25]=[CH:24][CH:23]=1

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 793516-Bromo-3,4-dimethoxybenzaldehydeHCID 2734370(3-Methoxyphenyl)boronic acid

Product 1

HCID 225710312-(3-Methoxyphenyl)-4,5-dimethoxybenzaldehydeYield 98%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 702EthanolSolventHCID 1140TolueneSolvent

Procedure

Tetrakis(triphenylphosphine)palladium(0) (0.36 g) was added to a solution of 4,5-dimethoxy-2-bromobenzaldehyde (2.5 g) in toluene (20 ml) and ethanol (20 ml), followed by addition of 2M aqueous sodium carbonate (20 ml). To this mixture was added 3-methoxyphenylboronic acid (1.7 g), and the mixture was heated to reflux. After 1 hour, the reaction was partitioned between water (150 ml) and ethyl acetate (300 ml). The organic layer was washed with saturated aqueous sodium bicarbonate (150 ml) and brine (150 ml), dried over magnesium sulfate and concentrated. Chromatography (silica, 20-30-40% ethyl acetate/hexanes) afforded 2.7 g (98%) of 2-(3-methoxyphenyl)-4,5-dimethoxybenzaldehyde as a yellow oil which solidified upon standing.

Workup

  1. temperaturethe mixture was heated to reflux
  2. customthe reaction was partitioned between water (150 ml) and ethyl acetate (300 ml)
  3. washThe organic layer was washed with saturated aqueous sodium bicarbonate (150 ml) and brine (150 ml)
  4. dry with materialdried over magnesium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-4a9e653bfc6d4c0ca90670797373721b
Source dataset
uspto-grants-2003_03
Patent number
US06531502B1

Reaction notes

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