4-Methyl-2-oxovaleric acid → 4-Methyl-1-pyrrolidin-1-yl-pentane-1,2-dione

HRID 1446689

Reaction equation

HRID 1446689 reaction equation
[CH3:1][CH:2]([CH3:9])[CH2:3][C:4](=[O:8])[C:5]([OH:7])=O.[NH:10]1[CH2:14][CH2:13][CH2:12][CH2:11]1>ClCCl.CN(C)C=O>[CH3:9][CH:2]([CH3:1])[CH2:3][C:4](=[O:8])[C:5]([N:10]1[CH2:14][CH2:13][CH2:12][CH2:11]1)=[O:7]

Participants

5

Reactant 2

HCID 704-Methyl-2-oxovaleric acidHCID 31268Pyrrolidine

Product 1

HCID 582867994-Methyl-1-pyrrolidin-1-yl-pentane-1,2-dioneYield 66.7%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideCatalystHCID 6344DichloromethaneSolvent2×

Procedure

Add oxalychloride (5.3 mL, 60.24 mmol, 1.6 eq.) slowly to the solution of 4-methyl-2-oxovaleric acid (4.90 g, 37.65 mmol, 1.0 eq.) in dichloromethane (50 mL) at 0° C. under nitrogen. Add Dimethylforamide (2 drops) last. Stir the reaction mixture overnight. Concentrate in vacuo. Add dichloromethane (100 mL). Add this solution to the solution of pyrrolidine (6.90 g, 97.02 mmol, 2.6 eq.) in dichloromethane (50 mL) at 0° C. slowly under nitrogen. Stir the reaction mixture for 1 hour at room temperature after addition. Wash with HCl (1 N) until the aqueous layer is acidic, then with aqueous saturated sodium chloride (2×20 mL) and water (2×30 mL). Dry the organic phase over MgSO4 and filter the drying reagent off. Concentrate in vacuo. Purify by column chromatography (0%→5% ethyl acetae in dichloromethane) to afford product (4.60 g, 66%).

Workup

  1. concentrationConcentrate in vacuo
  2. stirringStir the reaction mixture for 1 hour at room temperature
  3. additionafter addition
  4. washWash with HCl (1 N) until the aqueous layer
  5. dry with materialDry the organic phase over MgSO4
  6. filtrationfilter the drying reagent off
  7. concentrationConcentrate in vacuo
  8. customPurify by column chromatography (0%→5% ethyl acetae in dichloromethane)

Sources & evidence

ORD record
ord-89c8c6e332a74a39a268d03bc922ea35
Source dataset
uspto-grants-2010_02
Patent number
US07666879B2

Linked notes

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