反应详情

温度

90 °C

To a solution of 235.3 g (1 mole) of 4-(N-2-acetoxyethyl-N-ethylamino)benzaldehyde in dimethylformamide is added 738.7 g (2.0 moles) of 1,3-dioxolan-2-ylmethyltributylphosphonium bromide in dimethylformamide, and the mixture is heated at 90° C. Potassium t-butoxide (224.4 g, 2.0 moles) is added, and heating is continued at 90° C. for 16 hours. After cooling to room temperature, the solution is poured into a seven-fold excess of water, the aqueous mixture is saturated with sodium chloride, The combined organics are dried over 4A sieves, filtered through cotton, and evaporated. The crude reaction product is dissolved in 3M HCl, and the reaction is stirred at room temperature for 16 hours. After neutralization with saturated sodium bicarbonate, the aqueous mixture is extracted with three portions of ether, and the combined organics are dried over 4A sieves, filtered through cotton, and evaporated to yield the cinnamaldehyde as an oil. The product is purified by flash chromatography (silica gel, 1:1 hexane:ethyl acetate).

1. temperatureheating
2. temperatureAfter cooling to room temperature
3. dry with materialThe combined organics are dried over 4A sieves
4. filtrationfiltered through cotton
5. customevaporated
6. customThe crude reaction product
7. extractionAfter neutralization with saturated sodium bicarbonate, the aqueous mixture is extracted with three portions of ether
8. dry with materialthe combined organics are dried over 4A sieves
9. filtrationfiltered through cotton
10. customevaporated