反应详情

A catalytic amount of platinum oxide was added to a solution of 2-butyl-1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine (0.5 g) in trifluoroacetic acid (15 mL). The reaction mixture was reduced on a Parr apparatus under 50 psi (3.5 Kg/cm2) hydrogen pressure overnight. 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 1-5% methanol in dichloromethane containing 0.5% ammonium hydroxide). The eluant was concentrated under vacuum. The residue was recrystallized from hexane/ethyl acetate to provide 6,7,8,9-tetrahydro-2-butyl-1-(2-methylpropyl)-1H-imidazo[4,5-c][1,5]naphthyridin-4-amine as a solid, m.p. 143-147° C. Analysis: Calculated for C17H27N5: %C, 67.74; %H, 9.03; %N, 23.23. Found: %C, 61.90; %H, 7.51; %N, 19.91.

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 1-5% methanol in dichloromethane containing 0.5% ammonium hydroxide)
10. concentrationThe eluant was concentrated under vacuum
11. customThe residue was recrystallized from hexane/ethyl acetate