反应详情

温度

0 °C

2312 g (24.28 mol) of magnesium chloride are introduced with cooling into 18 l of acetonitrile. After the exothermic reaction has subsided, the solution is cooled to 0° C. and 3210 g (24.3 mol) of dimethyl malonate are added dropwise with stirring in the course of 45 minutes. After this, 4920 g (48.62 mol) of triethylamine are added dropwise at 0° C. with stirring in the course of 1.5 hours. After addition is complete, the mixture is stirred at 0° C. for a further 15 minutes. A solution of 4742 g (22.53 mol) of 2,6-dichloro-isonicotinyl chloride in 6670 ml of acetonitrile is then added dropwise at 0° C. with stirring in the course of 20 hours. The mixture is first stirred for 1 hour at 0° C. and then for 16 hours while slowly warming to room temperature. 15.9 l of concentrated hydrochloric acid are then added dropwise with stirring to the reaction mixture with cooling to 0 to 10° C. After this, 15.9 l of dichloromethane and 6.4 l of water are added with stirring and the organic phase is then separated off. The aqueous phase is extracted once more with 7.9 l of dichloromethane. The combined organic phases are washed twice with 4 l of water each time and then concentrated under reduced pressure. The residue which remains is stirred with 9.5 l of water, then filtered off with suction and washed successively, first with 6.3 l of water and then twice with 7.9 l of petroleum ether each time. The product obtained is dried at 40° C. under reduced pressure. In this manner, 6.17 kg (89.2% of theory) of dimethyl 2,6-dichloro-isonicotinoyl-malonate are obtained.

1. customAfter the exothermic reaction
2. stirringwith stirring in the course of 1.5 hours
3. additionAfter addition
4. stirringthe mixture is stirred at 0° C. for a further 15 minutes
5. stirringwith stirring in the course of 20 hours
6. stirringThe mixture is first stirred for 1 hour at 0° C.
7. temperaturefor 16 hours while slowly warming to room temperature
8. stirringwith stirring to the reaction mixture
9. temperaturewith cooling to 0 to 10° C
10. stirringwith stirring
11. customthe organic phase is then separated off
12. extractionThe aqueous phase is extracted once more with 7.9 l of dichloromethane
13. washThe combined organic phases are washed twice with 4 l of water each time
14. concentrationconcentrated under reduced pressure
15. stirringThe residue which remains is stirred with 9.5 l of water
16. filtrationfiltered off with suction
17. washwashed successively, first with 6.3 l of water
18. customThe product obtained
19. customis dried at 40° C. under reduced pressure