反応 #2175427

反応方程式

1-Butoxy-4-(4-(2,3-difluorophenyl)cyclohex-1-enyl)-2,3-difluorobenzene

hydrochloric acid

trimethyl borate

sec-Butyllithium

→

1-butoxy-4-(4-(2,3-difluorophenyl)cyclohex-1-enyl)-2,3-difluorophenol

収率 78.2%

溶媒

THF

THF

Ethyl acetate

n-hexane

cyclohexane

反応条件

後処理

1. 1
   workup.ADDITION23.0 ml) was added dropwise
2. 2
   workup.WAITin the temperature range of −74° C. to −65° C., and the stirring was continued for another 8 hours while the mixture
3. 3
   その他to come to 25° C
4. 4
   workup.ADDITIONThen, the reaction mixture was poured into a vessel
5. 5
   workup.ADDITIONmixed with them
6. 6
   その他to separate into organic and aqueous phases
7. 7
   抽出the extraction
8. 8
   洗浄The combined organic phase was washed successively with water
9. 9
   乾燥a saturated aqueous solution of sodium hydrogencarbonate and salt water, and dried over anhydrous magnesium sulfate
10. 10
    workup.DISTILLATIONThen, the solvent was distilled off under reduced pressure
11. 11
    その他The residue and acetic acid (50 ml) were put in a reaction vessel under an atmosphere of nitrogen
12. 12
    workup.ADDITION1.0 g) was added in the temperature range of 25° C. to 30° C.
13. 13
    workup.WAITthe stirring was continued for another 2 hours
14. 14
    workup.ADDITIONThen, the reaction mixture was poured into a vessel
15. 15
    workup.ADDITIONcontaining an aqueous solution of sodium hydrogensulfite (100 ml) and ethyl acetate (200 ml)
16. 16
    workup.ADDITIONmixed with them
17. 17
    その他had separated into organic and aqueous phases
18. 18
    抽出the extraction
19. 19
    洗浄The combined organic phase was washed successively with water and salt water
20. 20
    乾燥dried over anhydrous magnesium sulfate
21. 21
    workup.DISTILLATIONThen, the solvent was distilled off

実験手順

1-Butoxy-4-(4-(2,3-difluorophenyl)cyclohex-1-enyl)-2,3-difluorobenzene (s-20) (7.2 g) and THF (200 ml) were put in a reaction vessel under an atmosphere of nitrogen and cooled to −74° C. sec-Butyllithium (a 1.00 M solution in n-hexane and cyclohexane; 23.0 ml) was added dropwise thereto in the temperature range of −74° C. to −70° C., and the stirring was continued for another 2 hours. Then, trimethyl borate (2.0 g) in a THF (30 ml) solution was added dropwise thereto in the temperature range of −74° C. to −65° C., and the stirring was continued for another 8 hours while the mixture was allowed to come to 25° C. Then, the reaction mixture was poured into a vessel containing 1 N hydrochloric acid (100 ml) and ice-water (200 ml), and mixed with them. Ethyl acetate (200 ml) was added and the mixture was allowed to separate into organic and aqueous phases, and the extraction was carried out. The combined organic phase was washed successively with water, a saturated aqueous solution of sodium hydrogencarbonate and salt water, and dried over anhydrous magnesium sulfate. Then, the solvent was distilled off under reduced pressure. The residue and acetic acid (50 ml) were put in a reaction vessel under an atmosphere of nitrogen, and hydrogen peroxide (a 31% aqueous solution; 1.0 g) was added in the temperature range of 25° C. to 30° C., and then the stirring was continued for another 2 hours. Then, the reaction mixture was poured into a vessel containing an aqueous solution of sodium hydrogensulfite (100 ml) and ethyl acetate (200 ml), and mixed with them. The mixture was then allowed to stand until it had separated into organic and aqueous phases, and the extraction was carried out. The combined organic phase was washed successively with water and salt water, and dried over anhydrous magnesium sulfate. Then, the solvent was distilled off to give 1-butoxy-4-(4-(2,3-difluorophenyl)cyclohex-1-enyl)-2,3-difluorophenol (s-21) (5.9 g). The yield based on the compound (s-20) was 78.6%.

出典