Improvement on the synthesis of (E[hair space])-alk-3-enoic acids

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Nikitas Ragoussis and Valentine Ragoussis


Abstract

(E[hair space])-Alk-3-enoic acids have been prepared in high yield (85–90%) and excellent stereoselectivity (98–99%) by a modified Knoevenagel condensation of a straight carbon chain aldehyde with malonic acid, in dimethyl sulfoxide (DMSO) or dimethylformamide (DMF) at 100 °C, in the presence of piperidinium acetate as catalyst. Condensation of the aldehyde with a monoester of malonic acid, under the above conditions, gave the corresponding ester of (E[hair space])-alk-3-enoic acid in high yield (76–82%) and good stereoselectivity (90–92%). Condensation of the aldehyde with cyanoacetic acid gave the β,γ-unsaturated nitrile in moderate yield (35–40%) without stereoselectivity.


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