N,N-Dimethylaniline → Methyl 2-(4-chloro-6-ethyl-2-(piperidin-1-yl)pyrimidin-5-yl)pentanoate

HRID 1399738Notes

Reaction equation

HRID 1399738 reaction equation
[CH2:1]([C:3]1[N:4]=[C:5]([N:18]2[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]2)[NH:6][C:7](=O)[C:8]=1[CH:9]([CH2:14][CH2:15][CH3:16])[C:10]([O:12][CH3:13])=[O:11])[CH3:2].P(Cl)(Cl)([Cl:26])=O.CN(C)C1C=CC=CC=1>C1(C)C=CC=CC=1>[Cl:26][C:7]1[C:8]([CH:9]([CH2:14][CH2:15][CH3:16])[C:10]([O:12][CH3:13])=[O:11])=[C:3]([CH2:1][CH3:2])[N:4]=[C:5]([N:18]2[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]2)[N:6]=1

Participants

5

Reactant 3

HCID 949N,N-DimethylanilineHCID 24813Phosphorus oxychlorideHCID 136346171Methyl 2-(4-ethyl-6-oxo-2-(piperidin-1-yl)-1,6-dihydropyrimidin-5-yl)pentanoate

Product 1

HCID 86665657Methyl 2-(4-chloro-6-ethyl-2-(piperidin-1-yl)pyrimidin-5-yl)pentanoate

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a suspension of methyl 2-(4-ethyl-6-oxo-2-(piperidin-1-yl)-1,6-dihydropyrimidin-5-yl)pentanoate (2.53 g; 7.86 mmol) in dry toluene (15 mL) under nitrogen atmosphere were 5carefully added phosphorus oxychloride (7.30 mL; 79 mmol) and dimethylaniline (0.794 mL; 6.29 mmol) and the reaction mixture was heated under reflux for 3 h. The volatiles were removed under reduced pressure (while the reaction mixture was still at elevated temperature), the residue was cooled in an ice-bath and quenched by adding crushed ice and a saturated solution of sodium hydrogen carbonate until neutralization. The aqueous layer was extracted with ethyl acetate, the organics were collected, dried over magnesium sulphate, filtered and concentrated under reduced pressure. Purification by flash-chromatography on silica gel using a gradient of ethyl acetate (1-10%) in heptane furnished 0.352 g (8.6%, over 3 last steps) of the title compound as a yellow oil.

Workup

  1. temperaturethe reaction mixture was heated
  2. temperatureunder reflux for 3 h
  3. customThe volatiles were removed under reduced pressure (while the reaction mixture
  4. temperaturewas cooled in an ice-bath
  5. customquenched
  6. additionby adding
  7. customcrushed ice
  8. extractionThe aqueous layer was extracted with ethyl acetate
  9. customthe organics were collected
  10. dry with materialdried over magnesium sulphate
  11. filtrationfiltered
  12. concentrationconcentrated under reduced pressure
  13. customPurification by flash-chromatography on silica gel using a gradient of ethyl acetate (1-10%) in heptane

Sources & evidence

ORD record
ord-c2586e7f88734fba9f5189e6639b85bf
Source dataset
uspto-grants-2014_12
Patent number
US08906906B2

Reaction notes

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