反应详情

11.10 g (33.4 mmol) of 5-chloro-2-(2-chlorophenyl)-7-(3-hydroxy-1-butynyl)-benzoxazole was hydrogenated in 220 ml of ethyl acetate with 3.7 g of neutral Raney-nickel as catalyst. After 2.5 hours, H2 uptake had ceased and the nickel was filtered off. The solvent was removed in vacuo and the residue crystallized from di-isopropyl ether at 0° C. to give 8.33 g (74.2%) of title compound, mp 85-7° C. A second crop of 0.47 g (4.2%) was recovered.

1. filtrationthe nickel was filtered off
2. customThe solvent was removed in vacuo
3. customthe residue crystallized from di-isopropyl ether at 0° C.