Benzyl Alcohol → Benzyl 3-(5-oxopyrrolidin-2-YL)propanoate

HRID 1262684Notes

Reaction equation

HRID 1262684 reaction equation
[CH2:1]1[CH:8]2[N:4]([C:5](=[O:9])[CH2:6][CH2:7]2)[C:3](=[O:10])[CH2:2]1.Cl.[CH2:12]([OH:19])[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>>[CH2:12]([O:19][C:5](=[O:9])[CH2:6][CH2:7][CH:8]1[CH2:1][CH2:2][C:3](=[O:10])[NH:4]1)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1

Participants

4

Reactant 3

HCID 244Benzyl AlcoholHCID 313Hydrochloric AcidHCID 71893Rolziracetam

Product 1

HCID 15588871Benzyl 3-(5-oxopyrrolidin-2-YL)propanoate

Conditions

Temperature
98 °C

Procedure

Twenty-eight grams of dihydro 1H-pyrrolizine-3,5 (2H, 6H) dione is dissolved in 76 g of benzyl alcohol and 0.2 ml of concentrated hydrochloric acid is added. The solution is heated at 98° C. for 104 hours. The mixture is cooled and excess benzyl alcohol is distilled at 0.1 mm pressure to a maximum bath temperature of 100° C. The residual oil is dissolved in 1 l of anhydrous diethylether, 1 g of activated charcoal is added and the resulting suspension is filtered through filter aid. The filtrate is concentrated at reduced pressure and the resulting crystals are isolated by filtration. Recrystallization from cyclohexane containing 12% methylene chloride yields 5-oxo-2-pyrrolidinepropanoic acid benzyl ester with a melting point of 79°-80° C.

Workup

  1. temperatureThe mixture is cooled
  2. distillationexcess benzyl alcohol is distilled at 0.1 mm pressure to a maximum bath temperature of 100° C
  3. dissolutionThe residual oil is dissolved in 1 l of anhydrous diethylether
  4. addition1 g of activated charcoal is added
  5. filtrationthe resulting suspension is filtered
  6. filtrationthrough filter aid
  7. concentrationThe filtrate is concentrated at reduced pressure
  8. customthe resulting crystals are isolated by filtration
  9. customRecrystallization from cyclohexane containing 12% methylene chloride

Sources & evidence

ORD record
ord-01f6a3d6a6574a5ebd04c251b5019f97
Source dataset
uspto-grants-1984_06
Patent number
US04452990

Reaction notes

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