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involves a pent-1-en-3-one and a prop-2-en-1-amine leading to a bis(carbethoxyethyl)allylamine which converts in 1-allylpiperidin-4-one by acid hydrolysis and decarboxylation. Then a Mannich reaction occurs, in particular a condensation of a 4-piperidone derivative with paraformaldehyde and allylamine in presence of acetic acid

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