Dimethyl Sulfate → Methyl 2-hydroxy-5-isopropyl-4-methoxybenzoate

HRID 389952Notes

Reaction equation

HRID 389952 reaction equation
[OH:1][C:2]1[CH:11]=[C:10]([OH:12])[C:9]([CH:13]([CH3:15])[CH3:14])=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].[C:16](=O)([O-])[O-].[K+].[K+].S(OC)(OC)(=O)=O>C(#N)C>[OH:1][C:2]1[CH:11]=[C:10]([O:12][CH3:16])[C:9]([CH:13]([CH3:15])[CH3:14])=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5]

Participants

5

Reactant 3

HCID 6497Dimethyl SulfateHCID 11430Potassium CarbonateHCID 59167875Methyl 2,4-dihydroxy-5-(propan-2-yl)benzoate

Product 1

HCID 58236455Methyl 2-hydroxy-5-isopropyl-4-methoxybenzoateYield 98.1%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

A mixture of methyl 2,4-dihydroxy-5-isopropylbenzoate (420 mg, 2.0 mmol) and anhydrous potassium carbonate (331 mg, 2.4 mmol) in acetonitrile (10 ml) was treated with dimethyl sulphate (0.2 ml, 2.1 mmol) and the mixture was stirred at room temperature for 16 hours. The solvent was removed in vacuo and the residue acidified by the addition of 2M hydrochloric acid (10 ml). The solid material was collected by suction filtration, rinsed with water (2×10 ml) and sucked dry under reduced pressure to afford methyl 2-hydroxy-5-isopropyl-4-methoxybenzoate (440 mg, 98%) as a colourless solid. 1H NMR (DMSO-d6) 10.70 (1H, br s), 7.54 (1H, s), 6.53 (1H, s), 3.87 (3H, s), 3.84 (3H, s), 3.12 (1H, m), 1.13 (6H, d). MS: [M+H]+ 225.

Workup

  1. customThe solvent was removed in vacuo
  2. additionthe residue acidified by the addition of 2M hydrochloric acid (10 ml)
  3. filtrationThe solid material was collected by suction filtration
  4. washrinsed with water (2×10 ml)
  5. customsucked dry under reduced pressure

Sources & evidence

ORD record
ord-cd3458876b79400186b01f3f5fe5d7a3
Source dataset
uspto-grants-2013_02
Patent number
US08383619B2

Reaction notes

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