反应详情

To a solution of 2.03 g (0.00842 mole) of 5-nitro-2-pyridin-4-yl-benzooxazole (R. D. Haugwitz, et al., J. Med. Chem., 1982, 25, 969-74.) in methanol (150 mL) was added 0.2 g of 10% palladium on carbon catalyst. The mixture was hydrogenated on a Parr hydrogenator at 50 psi for 2 hours. The catalyst was filtered off and the solution was concentrated under reduced pressure. The residue was purified by silica gel chromatography, eluting with dichloromethane-methanol (100:0-80:20), to give 0.5 g of 2-pyridin-4-yl-benzooxazol-5-ylamine. HRMS (ES+) m/z Calcd for C12H9N3O+H [(M+H)+]: 212.0819. Found: 212.0818.

1. filtrationThe catalyst was filtered off
2. concentrationthe solution was concentrated under reduced pressure
3. customThe residue was purified by silica gel chromatography
4. washeluting with dichloromethane-methanol (100:0-80:20)