반응 #62885

반응 방정식

ammonium chloride

n-Butyl lithium

2-[4-bromo-2,3,5,6-tetrafluorobenzyloxy]-tetrahydropyran

Z-1-chloro-3-iodoprop-1-ene

→

2-[4-(3-chloroprop-2-en-1-yl)-2,3,5,6-tetrafluorobenzyloxy]-tetrahydropyran

용매

tetrahydrofuran

tetrahydrofuran

반응 조건

후처리

1. 1
   workup.ADDITIONcopper (I) bromide - dimethyl sulphide complex (1.54 g) was added in one portion
2. 2
   온도to warm to 0° C., for a period of 15 minutes
3. 3
   온도After cooling to -70° C.
4. 4
   workup.ADDITIONwas added to the reaction mixture, which
5. 5
   추출was then extracted with ethyl acetate
6. 6
   기타After drying
7. 7
   기타the solvent was evaporated under reduced pressure
8. 8
   기타to give an orange oil
9. 9
   세척eluting with petroleum ether (boiling range 40°-60° C.)
10. 10
    workup.ADDITIONcontaining diethyl ether (5% by volume)

실험 절차

n-Butyl lithium (2.5 M in hexane, 3 cm3) was added portionwise to a solution of 2-[4-bromo-2,3,5,6-tetrafluorobenzyloxy]-tetrahydropyran (1.7 g) in dry tetrahydrofuran (10 cm3) under an atmosphere of dry nitrogen, whilst the reaction temperature was maintained at -70° C. After 30 minutes, copper (I) bromide - dimethyl sulphide complex (1.54 g) was added in one portion and the reaction temperature allowed to warm to 0° C., for a period of 15 minutes. After cooling to -70° C., a solution of Z-1-chloro-3-iodoprop-1-ene (2.03 g) in dry tetrahydrofuran (3 cm3) was added portionwise, and the reaction mixture stirred for a further hour at -70° C. After warming to the ambient temperature, (ca. 25° C.), aqueous ammonium chloride was added to the reaction mixture, which was then extracted with ethyl acetate. After drying, the solvent was evaporated under reduced pressure to give an orange oil. The residue was then subjected to medium pressure column chromatography on a silica gel column using a Gilson apparatus, eluting with petroleum ether (boiling range 40°-60° C.) containing diethyl ether (5% by volume) to give 2-[4-(3-chloroprop-2-en-1-yl)-2,3,5,6-tetrafluorobenzyloxy]-tetrahydropyran, as a mixture consisting predominantly of the Z isomer.

출처