反応 #216445

反応方程式

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

溶媒

dichloromethane

反応条件

後処理

1. 1
   その他the solvent was removed in vacuo
2. 2
   その他The residue was partitioned between diethyl ether and water
3. 3
   その他The organic phase was separated
4. 4
   洗浄further washed with water and brine
5. 5
   乾燥before drying over anhydrous magnesium sulphate
6. 6
   その他The solvent was evaporated in vacuo
7. 7
   その他the residue was purified by column chromatography on alumina eluting with 1:6 dichloromethane

実験手順

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.

出典