反应详情

A mixture of 4-fluoro-3-nitrophenol (2.70 g, 17.2 mmol) and palladium on charcoal (10%, 0.31 g) in 60 mL ethyl acetate is hydrogenated under 50 psi of H2 using a Parr hydrogenation reactor. After shaking for 1 hour, the reaction mixture is filtered using a diatomaceous earth pad to remove catalyst. The filtrate is concentrated in vacuo, and the residue is sublimed to yield 2.18 g (100%) of Compound 24 as a white solid. MP: 142-144° C. 1H-NMR (d6 -DMSO) 8.82 (s, 1H); 6.70 (dd, 1H); 6.17 (dd, 1H); 5.85 (m, 1H); 4.92 (s, 2H). 19F-NMR (d6 -DMSO) 142.78 (t, 13.0 Hz). Anal. calc. for C6H6FNO: C, 56.69; H, 4.76; N, 11.02. Found: C, 57.28; H, 4.86; N, 10.65.

1. filtrationthe reaction mixture is filtered
2. customto remove catalyst
3. concentrationThe filtrate is concentrated in vacuo