反应详情

A solution of 5.63 g of 2-chloro-4-fluoro-5-nitroanisole in 90 ml of ethanol and 5 ml of triethylamine was hydrogenated at room temperature under 60 pounds per square inch with 1.0 g of 5% palladium on carbon for four hours. The catalyst was filtered off and the solvent was evaporated. The residue was slurried in chloroform and filtered thourough a plug of silica gel and then evaporated. This residue was chromatographed on silica gel using hexane/chloroform mixtures to afford 2.77 g (72%) of the subtitle compound. mp. 253-254° C. NMR (300 MHz, CDCl3): δ 6.88 (dd, J=10.6, 8.9, 1H); 6.32 (dd, J=7.4, 3.0, 1H); 6.20 (dt, J=8.9, 3.2,1H); 3.73 (s, 3H); 3.72 (br, 2H).

1. filtrationThe catalyst was filtered off
2. customthe solvent was evaporated
3. filtrationfiltered thourough a plug of silica gel
4. customevaporated
5. customThis residue was chromatographed on silica gel