反应详情

温度

5 °C

A solution of KBr (65.1 g, 0.55 mol) in water (5.9 L) was added to a solution of (5-bromo-2-fluorophenyl)(6-chloro-2-fluoro-3-(methoxymethoxy)pyridin-4-yl)methanol (2157 g, 5.47 mol) in DCM (5.9 L). The resulting biphasic mixture was cooled to 5° C. TEMPO (8.6 g, 0.055 mol) was added and the reaction mixture was stirred for 5 min. A solution of NaHCO3 (106 g, 1.26 mol, 0.23 eq) in bleach (6170 mL, 6.01 mol, 1.1 eq) was added slowly keeping the internal temperature below 10° C. After the addition was completed, the organic phase was separated. The aqueous layer was extracted with DCM (4 L×2). The combined organic layers were washed with 5% aqueous solution of sodium metabisulfite (6 L×1), brine (3 L×1) and dried over anhydrous Na2SO4. The solution was concentrated under reduced pressure to give 2200 g of (5-bromo-2-fluorophenyl)(6-chloro-2-fluoro-3-(methoxymethoxy)pyridin-4-yl)methanone as a yellow solid.

1. customthe internal temperature below 10° C
2. additionAfter the addition
3. customthe organic phase was separated
4. extractionThe aqueous layer was extracted with DCM (4 L×2)
5. washThe combined organic layers were washed with 5% aqueous solution of sodium metabisulfite (6 L×1), brine (3 L×1)
6. dry with materialdried over anhydrous Na2SO4
7. concentrationThe solution was concentrated under reduced pressure