Benzaldehyde → Diethyl 4-hydroxy-4-phenyl-1,3-butanedicarboxylate

HRID 263691Notes

Reaction equation

HRID 263691 reaction equation
[C:1]([O:11][CH2:12][CH3:13])(=[O:10])[CH2:2][CH2:3][CH2:4][C:5]([O:7][CH2:8][CH3:9])=[O:6].[CH:14](=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.C1CCCCC1.C([N-]C(C)C)(C)C.[Li+].[Cl-].[NH4+]>O1CCCC1>[OH:21][CH:14]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[CH:4]([C:5]([O:7][CH2:8][CH3:9])=[O:6])[CH2:3][CH2:2][C:1]([O:11][CH2:12][CH3:13])=[O:10]

Participants

6

Reactant 4

HCID 240BenzaldehydeHCID 13163Diethyl glutarateHCID 25517Ammonium ChlorideHCID 86604122LDA cyclohexane

Product 1

HCID 19038618Diethyl 4-hydroxy-4-phenyl-1,3-butanedicarboxylateYield 51.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

2.0 g of diethyl glutarate and 1.1 g of benzaldehyde were dissolved in 30 ml of tetrahydrofuran, and 8.5 ml of a 1.5M lithium diisopropylamide cyclohexane solution was dropwise added thereto at -78° C. under a nitrogen atmosphere, followed by stirring at the same temperature for 1.5 hours. A saturated ammonium chloride aqueous solution was added to the reaction solution, and the mixture was extracted with ethyl acetate. Then, the organic layer was washed with a saturated sodium chloride aqueous solution and dried over anhydrous magnesium sulfate. The drying agent was filtered off, and then, the solvent was distilled off under reduced pressure. The residue was purified by medium pressure liquid chromatography (Lobar column™, size C, Lichroprep™Si60, manufactured by Merck Co.; hexane/ethyl acetate=3/1) to obtain 1.56 g of the above-identified compound as colorless oily substance.

Workup

  1. customat -78° C.
  2. extractionthe mixture was extracted with ethyl acetate
  3. washThen, the organic layer was washed with a saturated sodium chloride aqueous solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationThe drying agent was filtered off
  6. distillationthe solvent was distilled off under reduced pressure
  7. customThe residue was purified by medium pressure liquid chromatography (Lobar column™, size C, Lichroprep™Si60, manufactured by Merck Co.; hexane/ethyl acetate=3/1)

Sources & evidence

ORD record
ord-5067783538904fa39aa80e1401fbaffa
Source dataset
uspto-grants-1997_07
Patent number
US05643958

Reaction notes

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