Das aus Aceton und Ammoniak in Gegenwart von Calciumchlorid darstellbare Piperidon (I) läßt sich unter den Bedingungen einer Knoevenagel‐Reaktion mit Cyanessigsäureäthylester (II) zu der Verbindung (III) kondensieren, die in ′I′7′2 Gegenwart eines Palladiumkatalysators zu dem Cyanessigsäurederivat (IV) hydriert werden kann.
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