Boron tribromide → HCID 69497894, compound

HRID 2085221Notes

Reaction equation

HRID 2085221 reaction equation
[CH2:1]([N:3]1[C:7](=[O:8])[C:6](=[CH:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[O:16]C)[N:5]=[C:4]1[CH3:18])[CH3:2].B(Br)(Br)Br>ClCCl>[CH2:1]([N:3]1[C:7](=[O:8])[C:6](=[CH:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=2[OH:16])[N:5]=[C:4]1[CH3:18])[CH3:2]

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 69497811HCID 69497811, compound

Product 1

HCID 69497894HCID 69497894, compoundYield 88.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
-40 °C

Procedure

3-Ethyl-3,5-dihydro-5-(2′-methoxybenzylidene)-2-methylimidazol-4-one (1.2 g) was dissolved in dichloromethane (20 ml) and boron tribromide (1.5 ml) was added dropwise while stirring the mixture at −40° C. Thereafter, the mixture was stirred under ice-cooling for 1 hr, poured into ice water and extracted with chloroform. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 3-ethyl-3,5-dihydro-5-(2′-hydroxybenzylidene) -2-methylimidazol-4-one (1 g) as red crystals. The crystals and (S)-glycidyl nosylate (1.3 g) were dissolved in dimethylformamide (20 ml) and potassium carbonate (1.38 g) was added. The mixture was heated at 50° C. for 2 hr, poured into ice water and extracted with ethyl acetate. The organic layer was washed with saturated aqueous ammonium chloride solution, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give an oily product (1.02 g). This oily product and 4-(naphthalen-2-yl)piperidine were dissolved in methanol (10 ml) and the mixture was refluxed under heating for 2 hr. After cooling, the solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (chloroform/methanol) to give the title compound (0.52 g) as an oil.

Workup

  1. stirringThereafter, the mixture was stirred under ice-
  2. temperaturecooling for 1 hr
  3. extractionextracted with chloroform
  4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-35a75255363748cf99f37f0f5456c89f
Source dataset
uspto-grants-2004_04
Patent number
US06720320B2

Reaction notes

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