Acetic Acid → 2-[2-(4,4-Diphenylpiperid-1-yl)-ethoxy]-ethyl 2-acetyl-3-(3-nitrophenyl)-acrylate

Participants

Reaction Steps

4.1 g of 2-[2-(4,4-diphenylpiperid-1-yl)-ethoxy]-ethyl acetoacetate, 15 g of 3-nitrobenzaldehyde, 8 ml of acetic acid and 0.5 ml of piperidine are heated at the boiling point in 300 ml of toluene using a water separator. After 1.9 ml of water have been separated off, the cooled solution is washed with saturated sodium bicarbonate solution and then with water. After the organic phase has been dried with sodium sulfate, the clear reddish-brown solution is concentrated under a high vacuum. The resulting viscous residue is used for the condensation reaction, without further purification. Yield: 53 g of crude product as a cis/trans-isomer mixture. Other entraining agents which are suitable are: benzene and chlorinated hydrocarbons. The yield of crude product is 95-100% of theory.

Provenance & Evidence