反応 #44927

反応方程式

water

(2,5-dimethoxyphenyl)-2-oxoacetaldehyde

ethyl (E)-4-(diethoxyphosphoryl)-3-phenylbut-2-enoate

potassium tert-butoxide

→

product

収率 92.5%

ethyl (2Z, 4E)-6-(2,5-dimethoxyphenyl)-6-oxo-3-phenylhexa-2,4-dienoate

収率 92.5%

溶媒

tetrahydrofuran

tetrahydrofuran

tetrahydrofuran

反応条件

後処理

1. 1
   workup.ADDITIONis added dropwise, at 25° C
2. 2
   抽出extracted with ether
3. 3
   乾燥The organic phase is dried (Na2SO4)
4. 4
   その他the solvents are evaporated off under reduced pressure

実験手順

1.32 g (11.8 mmol) of potassium tert-butoxide and 30 ml of tetrahydrofuran are mixed together at 25° C. A solution of 3.85 g (11.8 mmol) of ethyl (E)-4-(diethoxyphosphoryl)-3-phenylbut-2-enoate in 30 ml of tetrahydrofuran is then added dropwise. A solution of 3 g (15.4 mmol) of (2,5-dimethoxyphenyl)-2-oxoacetaldehyde dissolved in 30 ml of tetrahydrofuran is added dropwise, at 25° C. The mixture is stirred for 16 hours at 25° C. It is poured into water and extracted with ether. The organic phase is dried (Na2SO4) and the solvents are evaporated off under reduced pressure. The 4 g of product obtained are purified by flash chromatography (80/20 heptane/ethyl acetate) (yellow oil: 0.46 g).

出典