Cyanessigester, Malonester, Methansulfonylessigester werden durch Alkylidenazlactone acyliert. Die Primärprodukte kondensieren leicht zu Alkylidentetramsäuren. Die Acylcyanessigester 2 isomerisieren unter dem Einfluß von Säuren zu Aminopyrrolinonen 3.
By reduction of the tetramic acids 1 or their derivatives 5 and 6 with complex borohydrides the pyrrolidinones 2 and 7 are obtained. Dehydration of 2 and 7 leads to the title compounds 3 and 8, respectively.
Abstract The 3-spiro-3ʹ,3ʹ-dimethyl-2ʹ-oxiranes of 5-benzylidene-2,4-dioxo-pyrrolidone, 5-benzyl-idene-2,4-dioxotetrahydrofuranone and 5-benzylidene-2,4-dioxotetrahydrothiophene yield the corresponding heterocyclic reductones (3 a-c) upon treatment with sulfuric acid. The tetramic acid reducton 3a can also be obtained by hydrolysis of the diazoniumsalt 5.
Bei Reaktionen mit genau bekanntem stereochemischen Verlauf ist eine Korrelation der betrachteten Stoffe mit bekannten Vergleichs‐ Verbindungen möglich.
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