A New Method for the Synthesis of 3-Pyrrolin-2-one Derivatives. -It is found that treatment of the keto ester (I) with primary amines and acetyl hydrazine results in formation of pyrrolines of type (III) or (V) depending on the educt ratio used. Reaction of the phenyl analogue (VI) always gives pyrrolines of type (VII). -(KOCHARYAN, S. T.; CHURKINA, N. P.; RAZINA, T. L.; KARAPETYAN, V. E.; OGANDZHANYAN, S. M.; VOSKANYAN, V. S.; BABAYAN, A. T.; Khim.
Die Einführung einer Methyloder Allylgruppe in den Carbomethoxymethyl‐Rest der Ammoniumsalze (I) bzw. (IV) erhöht deutlich die Isomerisierungstendenz der Stevens‐Umlagerungsprodukte (II) und (V): Einstündiges Erhitzen von (IIb), (IIc) oder (V) auf 17.0‐l 80°C liefert nahezu quantitativ die Isomeren (III) bzw. (VI).
Pyridazine derivatives R 0500Synthesis of Pyridazinone Derivatives -[via reaction of 2-oxo-3-pentenoic acid esters (I) with hydrazine derivatives]. -(HOVAKIMYAN, S. A.; BABAKHANYAN, A. V.; VOSKANYAN, V. S.; KARAPETIAN, V. E.; PANOSYAN, G. A.; KOCHARIAN, S. T.; Chem. Heterocycl.
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