反应详情

温度

23 °C

DIBAL-H (15.1 ml, 0.0225 mol) was added at a rate of 50 ml/hour, by means of a syringe pump, to a solution of 3-carboxyethyl-4-(4-fluorophenyl)-piperidine-6-one (1.99 g, 0.0075 mol) in tetrahydrofuran (15 ml) at −70° C. under an argon atmosphere keeping the temperature below 0° C. The mixture was allowed to warm to 23° C. and stirred for 45 minutes, then a solution of methanol (0.9 ml) in toluene (7.5 ml) was added to destroy the excess DIBAL-H, followed by 30% potassium carbonate solution (8.5 ml), all below 30° C. The organic phase was separated, dried with anhydrous sodium sulphate, filtered, and evaporated to afford the title compound (1.54 g) as a slightly colored oil, which was crystallized by trituration with ether. Yield 67%.

1. customat −70° C.
2. customthe temperature below 0° C
3. customto destroy the excess DIBAL-H
4. customfollowed by 30% potassium carbonate solution (8.5 ml), all below 30° C
5. customThe organic phase was separated
6. dry with materialdried with anhydrous sodium sulphate
7. filtrationfiltered
8. customevaporated