反应详情

温度

95 °C

2.7 l of dimethylformamide are placed in a reactor under inert atmosphere. 251.4 g of N-BOC-3(R,S)-methylsulfonyloxy-piperidine are added with warming. At an internal temperature of 50° C. 256.8 g of potassium thioacetate are added at once. After stirring for 90 min at 95° C. the reaction mixture is transferred into a reactor filled with 4 l of water. 4.2 l of petroleum ether are added. After vigorous stirring for 5 minutes the aqueous phase is removed. After readdition of water the pH is adjusted to >8 with sodium hydroxide. The organic phase is separated, washed with water and treated with active charcoal. The solution is evaporated to dryness. After flash chromatography on silica with petroleum ether, toluene, and ethyl acetate and concentration of the product containing solution crystallization occurs on cooling and 110 g of N-BOC-3(R,S)-acetylthio-piperidine are obtained.

1. temperaturewith warming
2. customAt an internal temperature of 50° C
3. customis transferred into a reactor
4. stirringAfter vigorous stirring for 5 minutes the aqueous phase
5. customis removed
6. customThe organic phase is separated
7. washwashed with water
8. additiontreated with active charcoal
9. customThe solution is evaporated to dryness
10. additionAfter flash chromatography on silica with petroleum ether, toluene, and ethyl acetate and concentration of the product containing
11. customsolution crystallization
12. temperatureon cooling