Potassium Carbonate → 3-Benzyl-3-methyl-2,3-dihydro-benzofuran-6-carboxylic acid methyl ester

HRID 523502Notes

Reaction equation

HRID 523502 reaction equation
[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:9]=[CH:8][C:7](I)=[C:6]([O:11][CH2:12][C:13]([CH3:15])=[CH2:14])[CH:5]=1.C(=O)([O-])[O-].[K+].[K+].[C:23]1(B(O)O)[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>CN(C=O)C.[Cl-].C([N+](CCCC)(CCCC)CCCC)CCC.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH3:1][O:2][C:3]([C:4]1[CH:9]=[CH:8][C:7]2[C:13]([CH2:15][C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)([CH3:14])[CH2:12][O:11][C:6]=2[CH:5]=1)=[O:16]

Participants

7

Reactant 3

HCID 11430Potassium CarbonateHCID 66827Phenylboronic AcidHCID 251290454-Iodo-3-(2-methyl-allyloxy)-benzoic acid methyl ester

Product 1

HCID 251290463-Benzyl-3-methyl-2,3-dihydro-benzofuran-6-carboxylic acid methyl esterYield 95.1%

Reagents, catalysts & solvents 3

HCID 70681Tetrabutylammonium ChlorideCatalystHCID 167845palladium(II) acetateCatalystHCID 6228DimethylformamideSolvent2×

Conditions

Temperature
115 °C

Procedure

To a solution of 4-Iodo-3-(2-methyl-allyloxy)-benzoic acid methyl ester (455 mg, 1.37 mmol) obtained in Example 4(A), in DMF (15 mL) were added Potassium carbonate (379 mg, 2.74 mmol), Tetrabutylammonium chloride (380 mg, 1.37 mmol), Palladium acetate (25.6 mg, 0.136 mmol) in DMF (5 mL) and Phenylboronic acid (200 mg, 1.64 mmol). The resulting mixture was stirred for 3 h at 115° C., cooled to room temperature, filtered over silica, washed with water, dried over MgSO4 and concentrated. Column chromatography (silica gel, heptane/CH2Cl2: 4/6) afforded 368 mg (95%) of the title compound as a slightly brown oil which crystallize. Mp: 52° C.

Workup

  1. temperaturecooled to room temperature
  2. filtrationfiltered over silica
  3. washwashed with water
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-4ec97f0fc9374703bd85f2f585f79ff2
Source dataset
uspto-grants-2016_05
Patent number
US09339486B2

Reaction notes

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