Water → (RS)-2-(2-buten-1-yl)-5,6-difluoro-1-indanone

HRID 264440Notes

Reaction equation

HRID 264440 reaction equation
[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[F:11])[C:7](=[O:12])[CH2:6][CH2:5]2.[CH3:13][CH:14](O)[CH:15]=[CH2:16].C1(C)C=CC(S(O)(=O)=O)=CC=1.O>COC(OC)(C)C>[CH2:13]([CH:6]1[CH2:5][C:4]2[C:8](=[CH:9][C:10]([F:11])=[C:2]([F:1])[CH:3]=2)[C:7]1=[O:12])[CH:14]=[CH:15][CH3:16]

Participants

6

Reactant 4

HCID 962WaterHCID 6101p-Toluenesulfonic acidHCID 117163-Buten-2-olHCID 117689445,6-Difluoro-1-indanone

Product 1

HCID 54100932(RS)-2-(2-buten-1-yl)-5,6-difluoro-1-indanoneYield 38%

Reagents, catalysts & solvents 1

HCID 64952,2-DimethoxypropaneSolvent

Procedure

A solution of 10.6 g of 5,6-difluoro-1-indanone, 13.1 ml of 3-buten-2-ol and 110 mg of p-toluenesulfonic acid in 110 ml of 2,2-dimethoxy-propane was boiled under reflux for 64 hours on a water separator filled with molecular sieve (0.4 nm, 2 mm pearl shaped). The reaction mixture was subsequently concentrated in a vacuum and purified by column chromatography on silica gel (hexane/diethyl ether 2:1). In addition to 3.6 g of educt there were obtained 5.32 g (38%) of (RS)-2-(2-buten-1-yl)-5,6-difluoro-1-indanone as a brown oil.

Workup

  1. additionseparator filled with molecular sieve (0.4 nm, 2 mm pearl shaped)
  2. concentrationThe reaction mixture was subsequently concentrated in a vacuum
  3. custompurified by column chromatography on silica gel (hexane/diethyl ether 2:1)
  4. additionIn addition to 3.6 g of educt

Sources & evidence

ORD record
ord-45c9d6486a3d41a2bb880c9c2d4fca65
Source dataset
uspto-grants-1997_07
Patent number
US05646173

Reaction notes

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