Hydrochloric Acid → 8-Methoxy-1-ethyl-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde

HRID 1811393Notes

Reaction equation

HRID 1811393 reaction equation
[CH3:1][O:2][C:3]1[C:12]2[NH:11][C:10](=[O:13])[CH2:9][CH2:8][C:7]=2[C:6]([CH:14]=[O:15])=[CH:5][CH:4]=1.[H-].[Na+].[H][H].[CH2:20](I)[CH3:21].Cl>CN(C=O)C.C(Cl)Cl>[CH3:1][O:2][C:3]1[C:12]2[N:11]([CH2:20][CH3:21])[C:10](=[O:13])[CH2:9][CH2:8][C:7]=2[C:6]([CH:14]=[O:15])=[CH:5][CH:4]=1

Participants

8

Reactant 5

HCID 313Hydrochloric AcidHCID 6340IodoethaneHCID 24758Sodium hydrideHCID 859802658-Methoxy-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehydeHCID 178418361HCID 178418361, compound

Product 1

HCID 866139138-Methoxy-1-ethyl-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehydeYield 91%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

8-Methoxy-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde (2.0 g) was dissolved in DMF (20 ml), and 0.43 g of sodium hydride (60% in oil) was added under ice cooling. After the addition, stirring was carried out at room temperature until the generation of hydrogen stopped. The resulting mixture was cooled in an ice water bath again, 1.2 ml of ethyl iodide was added dropwise, and stirring was carried out at room temperature for 8 hours. The reaction mixture was poured into iced aqueous hydrochloric acid, extraction with methylene chloride was performed, and the organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to thereby obtain 2.1 g (yield: 91%) of 8-methoxy-1-ethyl-2-oxo-1,2,3,4-tetrahydroquinoline-5-carboxaldehyde.

Workup

  1. additionAfter the addition
  2. temperatureThe resulting mixture was cooled in an ice water bath again
  3. stirringstirring
  4. dry with materialthe organic layer was dried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-7430a1f892e24a5c92c8734eeb643d76
Source dataset
uspto-grants-2013_01
Patent number
US08362252B2

Reaction notes

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