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- W2085489689 abstract "The 2(3H-furanones 1a – e react with methyl acrylate in benzene or dioxane solution to afford the spiro compounds 2a – e in an addition and cyclocondensation reaction sequence. With dimethyl acetylenedicarboxylate 1a, b give merely the addition products 3a, b, while 1c – e yields the spiro compounds 4a – c in a related addition-cyclocondensation step. Heterocyclische β-Enaminoester, 341). Neue Typen von Spiro-Verbindungen durch Additions- und Ringschlußreaktionen von 3-(2-Imidazolidinyliden)- und 3-(Tetrahydro-2(1H)-pyrimidinyliden)dihydro-2(3H)-furanonen mit Acrylsäure-methylester und Acetylendicarbonsäure-dimethylester Die 2(3H)-Furanone 1a – e reagieren mit Acrylsäure-methylester in Benzol- oder Dioxanlösung in einer Additions- und Cyclokondensations-Sequenz zu den Spiro-Verbindungen 2a – e. 1a, b ergeben mit Acetylendicarbonsäure-dimethylester die Additionsprodukte 3a, b; hingegen resultieren aus 1c – e in einer verwandten Additions-Cyclokondensationssequenz die Spiro-Verbindungen 4a – c." @default.
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- W2085489689 date "1984-05-01" @default.
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- W2085489689 title "Heterocyclic β‐Enamino Esters, 34. New Types of Spiro Compounds by Addition and Cyclization Reactions of 3‐(2‐Imidazolidinylidene)‐ and 3‐(Tetrahydro‐2(1 <i>H</i> )‐pyrimidinylidene)dihydro‐2(3 <i>H</i> ‐furanones with Methyl Acrylate and Dimethyl Acetylenedicarboxylate" @default.
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- W2085489689 doi "https://doi.org/10.1002/cber.19841170521" @default.
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