反应详情

As shown in step 2-iii of Scheme 2, 3-chloroperoxybenzoic acid (9.426 g, 42.06 mmol) was added to 3-bromo-5-methoxypyridine (4.25 g, 21 mmol) in 200 mL of DCM at RT. The reaction was stirred overnight and the mixture was washed with 200 mL of 2 N NaOH and 2×200 mL brine. The organic phase was dried over MgSO4, filtered and the volatiles removed under reduced pressure to provide 3-bromo-5-ethoxypyridine, 1-oxide (Compound 1002, 4.4 g): 1H NMR (CDCl3): δ 8.05 (s, 1H), 7.9 (s, 1H), 7.0 (s, 1H), 4.12 (q, 2H), 1.45 (t, 3H).

1. washthe mixture was washed with 200 mL of 2 N NaOH and 2×200 mL brine
2. dry with materialThe organic phase was dried over MgSO4
3. filtrationfiltered
4. customthe volatiles removed under reduced pressure