Hydrochloric Acid → 1-Cyclohexyl-4-hydroxy-2,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid

HRID 1831948Notes

Reaction equation

HRID 1831948 reaction equation
[CH:1]1([N:7]2[C:12](=[O:13])[C:11]([CH3:14])=[C:10]([OH:15])[C:9]([C:16]([O:18]C)=[O:17])=[C:8]2[CH3:20])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.Cl>[OH-].[Na+]>[CH:1]1([N:7]2[C:12](=[O:13])[C:11]([CH3:14])=[C:10]([OH:15])[C:9]([C:16]([OH:18])=[O:17])=[C:8]2[CH3:20])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6]1

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 54724174Methyl 1-cyclohexyl-4-hydroxy-2,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylate

Product 1

HCID 547241921-Cyclohexyl-4-hydroxy-2,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acidYield 94%

Reagents, catalysts & solvents 1

HCID 14798Sodium HydroxideSolvent

Procedure

A solution of methyl 1-cyclohexyl-4-hydroxy-2,5-dimethyl-6-oxo-1,6-dihydro-pyridine-3-carboxylate (0.35 g, 1.25 mmol) in 2 N NaOH (5 mL) was heated at reflux for 3.5 h. The reaction mixture was cooled room temperature, acidified to pH 1-2 with 1 N HCl, and washed with EtOAc. The organic solution was washed with brine, dried (MgSO4), filtered and concentrated under reduced pressure to afford 1-cyclohexyl-4-hydroxy-2,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid as a white solid (0.31 g, 94%): 1H NMR (300 MHz, MeOD) δ 4.30-4.00 (br s, 1H), 2.76 (br s, 5H), 1.90 (s, 3H), 1.90-1.80 (m, 2H), 1.75-1.60 (m, 3H), 1.50-1.15 (m, 3H).

Workup

  1. temperatureat reflux for 3.5 h
  2. washwashed with EtOAc
  3. washThe organic solution was washed with brine
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-3cc8ff2f0b22448db2703d19afa88f70
Source dataset
uspto-grants-2006_06
Patent number
US07067540B2

Reaction notes

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