Epetirimod → 6,7,8,9-tetrahydro-1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine

HRID 2056997Notes

Reaction equation

HRID 2056997 reaction equation
[CH3:1][CH:2]([CH3:18])[CH2:3][N:4]1[C:16]2[C:15]3[N:14]=[CH:13][CH:12]=[CH:11][C:10]=3[N:9]=[C:8]([NH2:17])[C:7]=2[N:6]=[CH:5]1.[H][H]>FC(F)(F)C(O)=O.[Pt]=O>[CH3:1][CH:2]([CH3:18])[CH2:3][N:4]1[C:16]2[C:15]3[NH:14][CH2:13][CH2:12][CH2:11][C:10]=3[N:9]=[C:8]([NH2:17])[C:7]=2[N:6]=[CH:5]1

Participants

5

Reactant 2

HCID 9942845EpetirimodHCID 178418361HCID 178418361, compound

Product 1

HCID 221726996,7,8,9-tetrahydro-1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine

Reagents, catalysts & solvents 2

HCID 82844Platinum oxide (PtO)CatalystHCID 6422Trifluoroacetic acidSolvent

Procedure

A catalytic amount of platinum oxide was added to a solution of 1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine (0.46 g) in trifluoroacetic acid (10 mL). The reaction mixture was reduced on a Parr apparatus under 45 psi (3.15 Kg/cm2) hydrogen pressure for 4 hours. The reaction mixture was filtered to remove the catalyst and the filtrate was concentrated under vacuum. The residue was combined with aqueous sodium bicarbonate then a small amount of 10% sodium hydroxide was added. The resulting precipitate was extracted with dichloromethane. The dichloromethane extract was dried over magnesium sulfate then concentrated under vacuum. The residue was purified by flash chromatography (silica gel eluting with 5% methanol in dichloromethane containing 0.5% ammonium hydroxide). The eluant was concentrated under vacuum. The residue was recrystallized from ethyl acetate to provide 6,7,8,9-tetrahydro-1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine as a solid, m.p. 222-226° C. Analysis: Calculated for C13H19N5: % C, 63.65; % H, 7.81; % N, 28.55; Found: % C, 63.07; % H, 7.51; % N, 28.00.

Workup

  1. filtrationThe reaction mixture was filtered
  2. customto remove the catalyst
  3. concentrationthe filtrate was concentrated under vacuum
  4. additiona small amount of 10% sodium hydroxide was added
  5. extractionThe resulting precipitate was extracted with dichloromethane
  6. extractionThe dichloromethane extract
  7. dry with materialwas dried over magnesium sulfate
  8. concentrationthen concentrated under vacuum
  9. customThe residue was purified by flash chromatography (silica gel eluting with 5% methanol in dichloromethane containing 0.5% ammonium hydroxide)
  10. concentrationThe eluant was concentrated under vacuum
  11. customThe residue was recrystallized from ethyl acetate

Sources & evidence

ORD record
ord-17ba7e704d79423d934c5d5ed0c2274c
Source dataset
uspto-grants-2008_02
Patent number
US07335773B2

Reaction notes

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