ChemInform Abstract: INVESTIGATION ON THE CHEMISTRY OF BERBANS, III. REGIOSPECIFIC SYNTHESIS OF DEPYRROLOYOHIMBINONE BY DIECKMANN CONDENSATION OF UNSATURATED ESTERS
Abstract:Beim Erhitzen der Ester (II) in Benzol in Gegenwart von K‐tert.‐butylat oder Namethylat tritt Dieckmann‐Kondensation zu den Berbanon‐Derivaten (III) ein; wenn ein Überschuß an Base vennieden wird, läuft die Verschiebung der Doppelbindung im Vergleich zur Cyclisierung nur mit sehr kleiner Geschwindigkeit ab unter Bildung von Verbindungen des Typs (I) [(Ia) aus (IIa)].
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