反应详情

2-Furaldehyde (0.20 g) and tert-butyl 3-[{[2-amino-4-(trifluoromethyl)phenyl]carbonyl}(2-methylpropyl)amino]piperidine-1-carboxylate (0.33 g) were dissolved in acetic acid (5.0 ml), sodium triacetoxyborohydride (0.31 g) was added and the mixture was stirred at room temperature overnight. The reaction mixture was basified with saturated aqueous sodium hydrogen carbonate, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and the fraction eluted with ethyl acetate-hexane (0:10→10:0) was concentrated under reduced pressure. The residue was dissolved in trifluoroacetic acid (2 ml), and the mixture was stirred for 30 min. The reaction mixture was concentrated and purified by HPLC to give the object compound (12.2 mg).

1. extractionthe mixture was extracted with ethyl acetate
2. washThe extract was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customThe solvent was evaporated under reduced pressure
5. washthe fraction eluted with ethyl acetate-hexane (0:10→10:0)
6. concentrationwas concentrated under reduced pressure
7. dissolutionThe residue was dissolved in trifluoroacetic acid (2 ml)
8. stirringthe mixture was stirred for 30 min
9. concentrationThe reaction mixture was concentrated
10. custompurified by HPLC