反应详情

A solution of the product of stage (i) (4.5 g) in ethanol (150 ml) was hydrogenated at room temperature and pressure over 10% palladium oxide on charcoal (50% aq. paste, 0.5 g) for 2 h until hydrogen uptake ceased (1000 ml). Chloroform (150 ml) was added, and the mixture stirred until the product dissolved. The catalyst was filtered off, washed with ethanol, and the filtrate evaporated in vacuo to give a solid (3.8 g). A sample (0.2 g) was purified by flash chormatography eluted with chloroform:methanol (50:1) to give the title compound as a solid (0.11 g). m.p. 144°-146°.

1. customwas hydrogenated at room temperature
2. dissolutiondissolved
3. filtrationThe catalyst was filtered off
4. washwashed with ethanol
5. customthe filtrate evaporated in vacuo