Reaktion #216445

Reaktionsgleichung

Boron trifluoride etherate

(3-propyloxetan-3-yl)methyl hex-5-ynoate

Triethylamine

→

1-(Pent-4-ynyl)-4-propyl-2,6,7-trioxabicyclo[2.2.2]octane

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe solvent was removed in vacuo
2. 2
   SonstigeThe residue was partitioned between diethyl ether and water
3. 3
   SonstigeThe organic phase was separated
4. 4
   Waschenfurther washed with water and brine
5. 5
   Trocknenbefore drying over anhydrous magnesium sulphate
6. 6
   SonstigeThe solvent was evaporated in vacuo
7. 7
   Sonstigethe residue was purified by column chromatography on alumina eluting with 1:6 dichloromethane

Vorschrift

Boron trifluoride etherate (0.18 ml) was added to a stirred solution of (3-propyloxetan-3-yl)methyl hex-5-ynoate (1.33 g.) in dry dichloromethane (25 ml) at -70°. The mixture was allowed to warm to room temperature over 16 hours. Triethylamine (0.28 ml) was then added and the solvent was removed in vacuo. The residue was partitioned between diethyl ether and water. The organic phase was separated and further washed with water and brine before drying over anhydrous magnesium sulphate. The solvent was evaporated in vacuo and the residue was purified by column chromatography on alumina eluting with 1:6 dichloromethane:hexane saturated with ammonia. 1-(Pent-4-ynyl)-4-propyl-2,6,7-trioxabicyclo[2.2.2]octane was obtained as a colourless oil which crystallised on trituration (0.64 g) with hexane.

Quelle