Acetic Acid → Methyl 2-[(2-methyl-4-oxo-4H-chromen-8-yl)methylene]-3-oxobutanoate

HRID 1669794Notes

Reaction equation

HRID 1669794 reaction equation
[CH3:1][C:2]1[O:3][C:4]2[C:9]([C:10](=[O:12])[CH:11]=1)=[CH:8][CH:7]=[CH:6][C:5]=2[CH:13]=O.[O:15]=[C:16]([CH3:22])[CH2:17][C:18]([O:20][CH3:21])=[O:19].C(O)(=O)C.N1CCCCC1>ClCCl>[CH3:1][C:2]1[O:3][C:4]2[C:9]([C:10](=[O:12])[CH:11]=1)=[CH:8][CH:7]=[CH:6][C:5]=2[CH:13]=[C:17]([C:16](=[O:15])[CH3:22])[C:18]([O:20][CH3:21])=[O:19]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 7757Methyl acetoacetateHCID 8082PiperidineHCID 133748832-Methyl-4-oxo-4H-chromene-8-carbaldehyde

Product 1

HCID 67342184Methyl 2-[(2-methyl-4-oxo-4H-chromen-8-yl)methylene]-3-oxobutanoate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

1 g (5.31 mmol) of 2-methyl-4-oxo-4H-chromene-8-carbaldehyde, 680 mg (5.84 mmol) of methyl 3-oxobutanoate, 456 μl (7.97 mmol) of acetic acid and 105 μl (1.06 mmol) of piperidine in 50 ml of anhydrous dichloromethane are stirred under reflux with a water trap for 24 h. After cooling, the reaction solution is diluted with dichloromethane (100 ml) and washed successively with saturated sodium bicarbonate solution and saturated sodium chloride solution. The organic phase is dried over magnesium sulfate and concentrated. The residue is recrystallized from isopropanol. 1.43 g (94% of theory) of the title compound are obtained as an E/Z mixture.

Workup

  1. temperatureunder reflux with a water trap for 24 h
  2. temperatureAfter cooling
  3. washwashed successively with saturated sodium bicarbonate solution and saturated sodium chloride solution
  4. dry with materialThe organic phase is dried over magnesium sulfate
  5. concentrationconcentrated
  6. customThe residue is recrystallized from isopropanol

Sources & evidence

ORD record
ord-dcbfc140d1544dca90236faad055afe9
Source dataset
uspto-grants-2011_08
Patent number
US07989633B2

Reaction notes

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