6-Hydroxy-3-methyl-4-vinyl-phthalic Acid Dimethyl Ester → 4-Ethyl-6-hydroxy-3-methyl-phthalic Acid Dimethyl Ester

HRID 2378817Notes

Reaction equation

HRID 2378817 reaction equation
[CH3:1][O:2][C:3](=[O:18])[C:4]1[C:5](=[C:10]([CH3:17])[C:11]([CH:15]=[CH2:16])=[CH:12][C:13]=1[OH:14])[C:6]([O:8][CH3:9])=[O:7]>C1C=CC=CC=1.CCOC(C)=O>[CH3:1][O:2][C:3](=[O:18])[C:4]1[C:5](=[C:10]([CH3:17])[C:11]([CH2:15][CH3:16])=[CH:12][C:13]=1[OH:14])[C:6]([O:8][CH3:9])=[O:7]

Participants

4

Reactant 1

HCID 597944986-Hydroxy-3-methyl-4-vinyl-phthalic Acid Dimethyl Ester

Product 1

HCID 597944774-Ethyl-6-hydroxy-3-methyl-phthalic Acid Dimethyl EsterYield 88.4%

Reagents, catalysts & solvents 2

HCID 241BenzeneSolventHCID 8857Ethyl AcetateSolvent

Procedure

6-Hydroxy-3-methyl-4-vinyl-phthalic acid dimethyl ester (1.27 g, 5.11 mmol) was dissolved in benzene (10 mL) and EtOAc (10 mL). Tristriphenylphosphine rhodium chloride (150 mg) was added and the reaction was placed under an atmosphere of hydrogen. Stirring at room temperature was continued. After 14 hours, the solvents were removed in vacuo and the crude material was purified by silica gel chromatography to provide 1.14 g (88%) of the desired product as an off-white solid. 1H NMR (300 MHz, CDCl3): δ=1.19 (t, J=7.8 Hz, 3H), 2.10 (s, 3H), 2.60 (q, J=7.8 Hz, 2H), 3.89 (s, 6H), 6.87 (s, 1H), 10.79 (s, 1H) ppm.

Workup

  1. customthe solvents were removed in vacuo
  2. customthe crude material was purified by silica gel chromatography

Sources & evidence

ORD record
ord-1b1f2925b6a445dca2a11af3bfed325f
Source dataset
uspto-grants-2008_12
Patent number
US07470724B2

Reaction notes

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