反应详情

A mixture of 2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]-5-nitropyridine (13.4 g), palladium-carbon (5%, 1.5 g) and ethyl acetate (200 ml)--methanol (150 ml) was subjected catalytic hydrogenation at room temperature under one atmospheric pressure. The catalyst was filtered off, and the filtrate was concentrated under reduced pressure. The residual crystals were collected by filtration to obtain 5-amino-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine (11.4 g, 93%). Recrystallization from ethyl acetate--hexane gave brown crystals, m.p.107.0°-108.0° C.

1. customat room temperature
2. filtrationThe catalyst was filtered off
3. concentrationthe filtrate was concentrated under reduced pressure
4. filtrationThe residual crystals were collected by filtration