Potassium Carbonate → 3-(3-Methyl-benzyloxy)-phthalic acid dimethyl ester

HRID 709558

Reaction equation

HRID 709558 reaction equation
[CH3:1][O:2][C:3](=[O:15])[C:4]1[C:5](=[C:10]([OH:14])[CH:11]=[CH:12][CH:13]=1)[C:6]([O:8][CH3:9])=[O:7].C(=O)([O-])[O-].[K+].[K+].Br[CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[C:26]([CH3:30])[CH:25]=1>CC(C)=O>[CH3:1][O:2][C:3](=[O:15])[C:4]1[C:5](=[C:10]([O:14][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[C:26]([CH3:30])[CH:25]=2)[CH:11]=[CH:12][CH:13]=1)[C:6]([O:8][CH3:9])=[O:7]

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 12099m-Xylyl bromideHCID 12223651Dimethyl 3-hydroxyphthalate

Product 1

HCID 669063523-(3-Methyl-benzyloxy)-phthalic acid dimethyl esterYield 114.3%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

To a stirred suspension of 3-hydroxyphthalic acid dimethyl ester (1.4 g, 6.4 mmol) in acetone (30 mL) and potassium carbonate (2.7 g, 19.3 mmol) was added 1-bromomethyl-3-methyl-benzene (0.91 mL, 6.7 mmol) and refluxed overnight. The solvent was evaporated and the residue was partitioned between water (100 mL) and ethyl acetate (150 mL) and washed with water (2×100 mL). The combined organic phases was dried, concentrated and purified by flash column chromatography (EtOAc/Hexane) to give 3-(3-methyl-benzyloxy)-phthalic acid dimethyl ester (2.3 g, 115% crude yield). The product was used in the next step without further purification.

Workup

  1. temperaturerefluxed overnight
  2. customThe solvent was evaporated
  3. customthe residue was partitioned between water (100 mL) and ethyl acetate (150 mL)
  4. washwashed with water (2×100 mL)
  5. customThe combined organic phases was dried
  6. concentrationconcentrated
  7. custompurified by flash column chromatography (EtOAc/Hexane)

Sources & evidence

ORD record
ord-3695141934754cf1a8365eb46d83cb2c
Source dataset
uspto-grants-2015_11
Patent number
US09181216B2

Linked notes

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