Benzaldehyde → 6-Bromoflavanone

HRID 2096447Notes

Reaction equation

HRID 2096447 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.[CH:12](=O)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>C(O)C.O>[Br:1][C:2]1[CH:7]=[C:6]2[C:5](=[CH:4][CH:3]=1)[O:11][CH:12]([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[CH2:9][C:8]2=[O:10]

Participants

5

Reactant 2

HCID 240BenzaldehydeHCID 959915'-Bromo-2'-hydroxyacetophenone

Product 1

HCID 52705456-BromoflavanoneYield 21%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent2×

Procedure

A mixture of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (29 g, 0.135 mol), benzaldehyde (14.3 g, 0.135 mol) and borax (51.5 g, 0.135 mol) in ethanol (180 mL) and H2O (300 mL) was refluxed for one day. The reaction mixture was cooled, diluted with an equal volume of H2O and extracted with ethyl acetate. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromo-2-phenyl-chroman-4-one (8.5 g, 21%). 1H-NMR (CDCl3): 2.89 (dd, 1H), 3.06 (dd, 1H), 5.46 (dd, 1H), 6.95 (d, 1H), 7.37-7.46 (m, 5H), 7.58 (d, 1H), 8.02 (d, 1H).

Workup

  1. temperaturewas refluxed for one day
  2. temperatureThe reaction mixture was cooled
  3. extractionextracted with ethyl acetate
  4. dry with materialThe organic layer was dried over anhydrous Na2SO4
  5. filtrationfiltered
  6. customevaporated

Sources & evidence

ORD record
ord-8a1b8f2435154aef95a5e937803004a1
Source dataset
uspto-grants-2013_05
Patent number
US08450308B2

Reaction notes

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