反应详情

To 5-nitro-2-(2-phenyl-2,3-dihydrobenzo[1,4]oxathiin-6-yloxy)pyridine (214 mg) in methanol (80 ml) at 60° C., NaIO4 (total 2.5 eq) was added in small portions until disappearance of the starting material. The mixture was poured into water and precipitate was filtered and washed with water. The crude product was purified by column chromatography using heptane-ethyl acetate (1:1) as an eluant. 1H NMR (400 MHz, CDCl3) δ: 9.02 (d, 1H, J 2.8 Hz), 8.51 (dd, 1H, J 9.1, 2.8 Hz), 7.45-7.56 (m, 6H), 7.32 (dd, 1H, J 9.0, 2.8 Hz), 7.21 (d, 1H, J 9.0 Hz), 7.10 (d, 1H, J 9.1 Hz), 5.77 (dd, 1H, J 12.0, 1.5 Hz), 3.34 (dd, 1H, 14.4, 1.5 Hz), 3.13 (dd, 1H, 14.4, 12.0 Hz).

1. filtrationwas filtered
2. washwashed with water
3. customThe crude product was purified by column chromatography