4-Methylcyclohexanone → 6-Bromo-4'-methylspiro(chroman-2,1'-cyclohexan)-4-one

HRID 2096493Notes

Reaction equation

HRID 2096493 reaction equation
[Br:1][C:2]1[CH:3]=[CH:4][C:5]([OH:11])=[C:6]([C:8](=[O:10])[CH3:9])[CH:7]=1.[CH3:12][CH:13]1[CH2:18][CH2:17][C:16](=O)[CH2:15][CH2:14]1.N1CCCC1>CO>[Br:1][C:2]1[CH:7]=[C:6]2[C:5](=[CH:4][CH:3]=1)[O:11][C:16]1([CH2:17][CH2:18][CH:13]([CH3:12])[CH2:14][CH2:15]1)[CH2:9][C:8]2=[O:10]

Participants

5

Reactant 3

HCID 115254-MethylcyclohexanoneHCID 31268PyrrolidineHCID 959915'-Bromo-2'-hydroxyacetophenone

Product 1

HCID 584240346-Bromo-4'-methylspiro(chroman-2,1'-cyclohexan)-4-oneYield 156.5%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (20 g, 0.093 mol), 4-methylcyclohexanone (21.31 g, 0.187 mol) and pyrrolidine (12.63 g, 0.178 mol) in methanol (400 mL) was refluxed for overnight. The reaction mixture was concentrated in vacuo, diluted with an equal volume of H2O and then added HCl until pH=1. The resulting mixture was extracted with EtOAc. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromo-4′-methylspiro(chroman-2,1′-cyclohexan)-4-one (45 g, 100%).

Workup

  1. temperaturewas refluxed for overnight
  2. concentrationThe reaction mixture was concentrated in vacuo
  3. additiondiluted with an equal volume of H2O
  4. extractionThe resulting mixture was extracted with EtOAc
  5. dry with materialThe organic layer was dried over anhydrous Na2SO4
  6. filtrationfiltered
  7. customevaporated

Sources & evidence

ORD record
ord-19973ce4e71c49c19636f6922bca341f
Source dataset
uspto-grants-2013_05
Patent number
US08450308B2

Reaction notes

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