Benzyl Bromide → 1-(2,4-Bis-benzyloxy-5-isobutyl-phenyl)-ethanone

HRID 2097298Notes

Reaction equation

HRID 2097298 reaction equation
[OH:1][C:2]1[CH:7]=[C:6]([OH:8])[C:5]([CH2:9][CH:10]([CH3:12])[CH3:11])=[CH:4][C:3]=1[C:13](=[O:15])[CH3:14].C(=O)([O-])[O-].[K+].[K+].[CH2:22](Br)[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>CN(C=O)C>[CH2:22]([O:1][C:2]1[CH:7]=[C:6]([O:8][CH2:13][C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][CH:2]=2)[C:5]([CH2:9][CH:10]([CH3:11])[CH3:12])=[CH:4][C:3]=1[C:13](=[O:15])[CH3:14])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1

Participants

5

Reactant 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 592647801-(2,4-Dihydroxy-5-isobutyl-phenyl)-ethanone

Product 1

HCID 247746071-(2,4-Bis-benzyloxy-5-isobutyl-phenyl)-ethanone

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
150 °C

Procedure

1-(2,4-Dihydroxy-5-isobutyl-phenyl)-ethanone (1 eq) was dissolved in DMF and potassium carbonate (4.4 eq) then benzyl bromide (4.4 eq) was added. The suspension was heated, with stirring to 150° C., under nitrogen, for 16 hrs. The solution was cooled to room temperature, filtered and concentrated to dryness. This solid was purified column chromatography (silica, hexanes:ethyl acetate 4:1) then re-crystallised from ethyl acetate:hexanes to give 1-(2,4-Bis-benzyloxy-5-isobutyl-phenyl)-ethanone as colourless crystals.

Workup

  1. temperatureThe suspension was heated
  2. temperatureThe solution was cooled to room temperature
  3. filtrationfiltered
  4. concentrationconcentrated to dryness
  5. customThis solid was purified column chromatography (silica, hexanes:ethyl acetate 4:1)
  6. customthen re-crystallised from ethyl acetate

Sources & evidence

ORD record
ord-d71938481c4344959bb55f7955490e59
Source dataset
uspto-grants-2013_05
Patent number
US08450310B2

Reaction notes

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