Methanol → 3-(Benzyloxy)-N,N-diethyl-1,6-dimethyl-4-oxo-1,4-dihydropyridine-2-carboxamide

HRID 2230915Notes

Reaction equation

HRID 2230915 reaction equation
[C:1](N1C=CN=C1)([N:3]1C=CN=C1)=O.[CH2:13]([O:20][C:21]1[C:26](=[O:27])[CH:25]=[C:24]([CH3:28])O[C:22]=1[C:29]([OH:31])=O)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[CH2:32]([NH:34][CH2:35][CH3:36])[CH3:33].CN.CO>CN(C=O)C>[CH2:13]([O:20][C:21]1[C:26](=[O:27])[CH:25]=[C:24]([CH3:28])[N:3]([CH3:1])[C:22]=1[C:29]([N:34]([CH2:35][CH3:36])[CH2:32][CH3:33])=[O:31])[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1

Participants

7

Reactant 5

HCID 887MethanolHCID 6329MethylamineHCID 8021DiethylamineHCID 682631,1'-CarbonyldiimidazoleHCID 98564973-(benzyloxy)-6-methyl-4-oxo-4H-pyran-2-carboxylic acid

Product 1

HCID 120106513-(Benzyloxy)-N,N-diethyl-1,6-dimethyl-4-oxo-1,4-dihydropyridine-2-carboxamideYield 68.9%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
40 °C

Procedure

1,1′-carbonyldiimidazole (1.87 g, 111.53 mmol) was added to a solution of the 3-(benzyloxy)-6-methyl-4-oxo-4H-pyran-2-carboxylic acid (2.0 g, 7.69 mmol) in DMF (15 ml) at room temperature. The resulting solution was heated at 40° C. for 3 hrs. A clear yellow solution was observed. Diethylamine (1.08 ml, 9.2 mmol) was added. The reaction mixture was stirred at 40 to 45° C. for 2 hrs. The reaction was cooled to room temperature at which time a solution of methylamine in methanol (11 ml of 2M solution in methanol, 15.4 mmol) was added. The solution was stirred at 65 to 70° C. for 15 hrs under pressure. The solvent was removed under reduced pressure and dichloromethane was added (70 ml). The solution was washed with water and dried over magnesium sulfate (1 g). Solvent evaporation gave light yellow oil as a crude product. The column was eluted with 10% to 25% methanol in ethyl acetate to give the titled compound (1.74 g, yield 67%). H-NMR (CDCl3) σδ: 1.09 (t, J=7.11 Hz, 3H, Me), 1.16 (t, J=7.04 Hz 3H, Me), 2.34 (s, 3H, Me), 3.13-3.30 (m, 2H, CH2), 3.47 (s, 3H, NMe), 3.50-3.60 (m, 2H, CH2), 4.91(d, J=10.76 Hz, 1H, CH2), 5.52(d, J=10.74 Hz, 1H, CH2), 6.41 (s, 1H, CH), 7.10-7.33 (m, 5H, Ph), Mass spect. 329 (M+1).

Workup

  1. additionwas added
  2. stirringThe solution was stirred at 65 to 70° C. for 15 hrs under pressure
  3. customThe solvent was removed under reduced pressure and dichloromethane
  4. additionwas added (70 ml)
  5. washThe solution was washed with water
  6. dry with materialdried over magnesium sulfate (1 g)
  7. customSolvent evaporation
  8. customgave light yellow oil as a crude product
  9. washThe column was eluted with 10% to 25% methanol in ethyl acetate

Sources & evidence

ORD record
ord-ab2874d147fe4c32ae6ff5a5c69829ad
Source dataset
uspto-grants-2002_07
Patent number
US06426418B1

Reaction notes

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