Potassium Carbonate → 2-(4-Methoxy-benzenesulfonyl)-5-methyl-hex-4-enoic acid ethyl ester

HRID 991036Notes

Reaction equation

HRID 991036 reaction equation
[CH2:1]([O:3][C:4](=[O:17])[CH2:5][S:6]([C:9]1[CH:14]=[CH:13][C:12]([O:15][CH3:16])=[CH:11][CH:10]=1)(=[O:8])=[O:7])[CH3:2].[CH:18](Br)=[CH:19][C:20](=[CH2:22])[CH3:21].C1OCCOCCOCCOCCOCCOC1.C([O-])([O-])=O.[K+].[K+]>CC(C)=O>[CH2:1]([O:3][C:4](=[O:17])[CH:5]([S:6]([C:9]1[CH:14]=[CH:13][C:12]([O:15][CH3:16])=[CH:11][CH:10]=1)(=[O:7])=[O:8])[CH2:18][CH:19]=[C:20]([CH3:22])[CH3:21])[CH3:2]

Participants

6

Reactant 4

HCID 11430Potassium CarbonateHCID 2855718-Crown-6HCID 14823722-[(4-Methoxyphenyl)sulfonyl]acetic acid ethyl esterHCID 53976308Bromoisoprene

Product 1

HCID 117591972-(4-Methoxy-benzenesulfonyl)-5-methyl-hex-4-enoic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

To a stirred solution of (4-methoxy-benzenesulfonyl)acetic acid ethyl ester (5.16 g, 20 mmol), isoprenyl bromide (3.0 g, 20 mmol) and 18-Crown-6 (500 mg) in acetone (250 ml) was added K2CO3 (10 gms, excess) and the mixture refluxed foe 24 hours. At the end, the reaction mixture was filtered and the acetone layer was concentrated. The residue obtained was extracted with chloroform, washed well with water, dried over anhydrous MgSO4, filtered and concentrated. The product obtained was purified by silica-gel column chromatography, eluting with 30% ethy acetate: hexane. The product 2-(4-methoxy-benzenesulfonyl)-5-methyl-hex-4- enoic acid ethyl ester was isolated as a colourless oil. Yield: 3.0 g, 93%.

Workup

  1. temperaturethe mixture refluxed foe 24 hours
  2. filtrationAt the end, the reaction mixture was filtered
  3. concentrationthe acetone layer was concentrated
  4. customThe residue obtained
  5. extractionwas extracted with chloroform
  6. washwashed well with water
  7. dry with materialdried over anhydrous MgSO4
  8. filtrationfiltered
  9. concentrationconcentrated
  10. customThe product obtained
  11. customwas purified by silica-gel column chromatography
  12. washeluting with 30% ethy acetate

Sources & evidence

ORD record
ord-2fa20c5b310d405b8a5dad9e86d5f2d0
Source dataset
uspto-grants-2002_10
Patent number
US06462073B2

Reaction notes

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