Ethyl Acetate → Benzenepropanoic acid, 4-bromo-β-hydroxy-, ethyl ester

HRID 1251109Notes

Reaction equation

HRID 1251109 reaction equation
[C:1]([O:4][CH2:5][CH3:6])(=[O:3])[CH3:2].C([N-]C(C)C)(C)C.[Li+].C1CCCCC1.[Br:21][C:22]1[CH:29]=[CH:28][C:25]([CH:26]=[O:27])=[CH:24][CH:23]=1.[Cl-].[NH4+]>O1CCCC1>[Br:21][C:22]1[CH:29]=[CH:28][C:25]([CH:26]([OH:27])[CH2:2][C:1]([O:4][CH2:5][CH3:6])=[O:3])=[CH:24][CH:23]=1

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 25517Ammonium ChlorideHCID 707414-BromobenzaldehydeHCID 86604122LDA cyclohexane

Product 1

HCID 12566304Benzenepropanoic acid, 4-bromo-β-hydroxy-, ethyl esterYield 80%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

Ethyl acetate (5.8 ml) was dissolved in tetrahydrofuran (80 ml), to which was then added 1.5M lithium diisopropylamide/cyclohexane solution (43 ml) in nitrogen atmosphere at −70° C., and then the mixture was stirred for 15 min. 4-Bromobenzaldehyde (10.151 g)/tetrahydrofuran (10 ml) solution was added to the reaction mixture, which was then stirred for 30 min. A saturated aqueous solution of ammonium chloride was added thereto, and then it was extracted with in ethyl acetate. The resulting organic layer was washed with water, dried (over MgSO4) and evaporated. The resulting residue was purified by (NH) silica gel column chromatography (ethyl acetate/hexane system), to give the title compound as a yellow oil (11.906 g, yield; 80%).

Workup

  1. stirringwas then stirred for 30 min
  2. extractionit was extracted with in ethyl acetate
  3. washThe resulting organic layer was washed with water
  4. dry with materialdried (over MgSO4)
  5. customevaporated
  6. customThe resulting residue was purified by (NH) silica gel column chromatography (ethyl acetate/hexane system)

Sources & evidence

ORD record
ord-25d660e56a5c44eaa7c3fb5c9ccacd7e
Source dataset
uspto-grants-2002_01
Patent number
US06340759B1

Reaction notes

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