반응 #44692

반응 방정식

1,3-dicyclohexylcarbodiimide

p-toluenesulfonic acid monohydrate

ethanol

isonicotinic acid

→

Ethyl 3-oxo-3-(4-pyridinyl)propanoate

용매

dichloromethane

dichloromethane

반응 조건

후처리

1. 1
   기타The precipitate formed
2. 2
   여과is filtered off
3. 3
   세척washed with dichloromethane
4. 4
   농축The filtrate is concentrated under reduced pressure
5. 5
   workup.DISSOLUTIONThe residue is dissolved in 1200 ml of ethanol
6. 6
   workup.STIRRINGthe mixture is stirred
7. 7
   온도under reflux for one hour
8. 8
   온도After cooling
9. 9
   기타the ethanol is removed under reduced pressure
10. 10
    workup.DISSOLUTION900 ml of water and dissolved
11. 11
    온도by heating
12. 12
    기타The organic phase is separated off
13. 13
    세척washed with 600 ml of saturated sodium bicarbonate solution and saturated sodium chloride solution
14. 14
    건조dried over sodium sulfate
15. 15
    농축The mixture is concentrated under reduced pressure
16. 16
    여과The crude product is filtered through a silica gel frit
17. 17
    추출is extracted with dichloromethane
18. 18
    건조the extract is dried over sodium sulfate
19. 19
    농축concentrated under reduced pressure
20. 20
    여과The crude product is filtered through a silica gel frit
21. 21
    기타This gives a total of 25.9 g (42% of theory) of product

실험 절차

25 g (203 mmol) of isonicotinic acid, 35.12 g (243.7 mmol) of 2,2-dimethyl-1,3-dioxolane-4,6-dione and 49.6 g (406 mmol) of 4-dimethylaminopyridine are initially charged in 300 ml of dichloromethane, and the mixture is cooled to 0° C. A 1N solution of 46.1 g (223.4 mmol) of 1,3-dicyclohexylcarbodiimide in dichloromethane is added dropwise. The mixture is stirred at room temperature for 2 hours. The precipitate formed is filtered off and washed with dichloromethane. The filtrate is concentrated under reduced pressure. The residue is dissolved in 1200 ml of ethanol, a solution of 96.6 g (507.7 mmol) of p-toluenesulfonic acid monohydrate in 300 ml of ethanol is added and the mixture is stirred under reflux for one hour. After cooling, the ethanol is removed under reduced pressure. The residue is taken up in 1000 ml of ethyl acetate and 900 ml of water and dissolved by heating. The organic phase is separated off, washed with 600 ml of saturated sodium bicarbonate solution and saturated sodium chloride solution and dried over sodium sulfate. The mixture is concentrated under reduced pressure. The crude product is filtered through a silica gel frit using dichloromethane/methanol 10:1. Since there is still product present in the aqueous phase, it is extracted with dichloromethane and the extract is dried over sodium sulfate and concentrated under reduced pressure. The crude product is filtered through a silica gel frit using dichloromethane/methanol 10:1. This gives a total of 25.9 g (42% of theory) of product.

출처