Lithium hydroxide, monohydrate → 4-Oxo-1-((4'-(trifluoromethyl)biphenyl-2-yl)methyl)-1,4-dihydro-1,5-naphthyridine-3-carboxylic acid

HRID 1497697Notes

Reaction equation

HRID 1497697 reaction equation
[O:1]=[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][N:10]=2)[N:5]([CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=2[C:19]2[CH:24]=[CH:23][C:22]([C:25]([F:28])([F:27])[F:26])=[CH:21][CH:20]=2)[CH:4]=[C:3]1[C:29]([O:31]CC)=[O:30].O.[OH-].[Li+]>CS(C)=O.CO.O.C(#N)C>[O:1]=[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][N:10]=2)[N:5]([CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=2[C:19]2[CH:24]=[CH:23][C:22]([C:25]([F:28])([F:27])[F:26])=[CH:21][CH:20]=2)[CH:4]=[C:3]1[C:29]([OH:31])=[O:30]

Participants

7

Reactant 2

HCID 168937Lithium hydroxide, monohydrateHCID 86725449Ethyl 4-oxo-1-((4'-(trifluoromethyl)biphenyl-2-yl)methyl)-1,4-dihydro-1,5-naphthyridine-3-carboxylate

Product 1

HCID 769026754-Oxo-1-((4'-(trifluoromethyl)biphenyl-2-yl)methyl)-1,4-dihydro-1,5-naphthyridine-3-carboxylic acidYield 43.2%

Reagents, catalysts & solvents 4

HCID 679Dimethyl SulfoxideSolventHCID 887MethanolSolventHCID 962WaterSolvent2×HCID 6342AcetonitrileSolvent

Procedure

To a solution of ethyl 4-oxo-1-((4′-(trifluoromethyl)biphenyl-2-yl)methyl)-1,4-dihydro-1,5-naphthyridine-3-carboxylate (37) (11 mg, 0.024 mmol) in dimethyl sulfoxide (1 mL) and methanol (5 mL) was added the solid lithium hydroxide monohydrate (51.0 mg, 1.22 mmol) at room temperature under a nitrogen atmosphere. It gave a clear solution within 30 minutes and this light yellow solution was stirred for 15 h at which time LCMS analysis indicated the absence of starting material. Then, the mixture was diluted with water and the methanol was removed under vacuum. The basic aqueous layer was diluted with water and then neutralized with 1.0N HCl. The resulting acid was extracted with ethyl acetate (2×30 mL) and the combined extracts were washed with brine solution and dried over anhydrous MgSO4. Filtration and concentration gave a brown residue which was dissolved in acetonitrile and water. It was frozen and then lyophilized under high vacuum to obtain 4-oxo-1-((4′-(trifluoromethyl)biphenyl-2-yl)methyl)-1,4-dihydro-1,5-naphthyridine-3-carboxylic acid (38) (4.4 mg, 42.6% yield) as a light yellow solid.

Workup

  1. customIt gave a clear solution within 30 minutes
  2. customthe methanol was removed under vacuum
  3. additionThe basic aqueous layer was diluted with water
  4. extractionThe resulting acid was extracted with ethyl acetate (2×30 mL)
  5. washthe combined extracts were washed with brine solution
  6. dry with materialdried over anhydrous MgSO4
  7. filtrationFiltration and concentration
  8. customgave a brown residue which
  9. temperatureIt was frozen

Sources & evidence

ORD record
ord-26ff61e305004141b2d466ea1a72fd96
Source dataset
uspto-grants-2015_12
Patent number
US09199987B2

Reaction notes

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