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Hetero-Diels-Alder reaction of 3-aryl-2-benzoyl-2-propenenitriles with enol ethers. Synthesis of 2-alkoxy-3,4-dihydro-2H-pyran-5-carbonitriles

Hetero-Diels-Alder-Reaktion von 3-Aryl-2-benzoyl-2-propennitrilen mit Enolethern. Synthese von 2-Alkoxy-3,4-dihydro-2H-pyran-5-nitrilen

  • Organische Chemie Und Biochemie
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Summary

The hetero-Diels-Alder reaction of 3-aryl-2-benzoyl-2-propenenitriles1a–d with enol ethers2a–c yieldscis/trans diastereoisomers of 2-alkoxy-4,6-diaryl-3,4-dihydro-2H-pyran-5-carbonitriles3 and4 in 79–98% yield. The similar reaction of1a–c with cyclic enol ether5 affords diastereoisomeric cycloadducts6 and7 withcis annulated pyran rings. Reaction of3 with sulfuric acid leads to 2-hydroxy-3,4-dihydro-2H-pyran-5-carbonitriles8 and9.

Zusammenfassung

Die Hetero-Diels-Alder-Reaktion der 3-Aryl-2-benzoyl-2-propennitrile1a–d mit den Enolethern2a–c ergibt diecis/trans-diastereomeren 2-Alkoxy-4,6-diaryl-3,4-dihydro-2H-pyran-5-nitrile3 und4 in einer Ausbeute von 79–98%. Dieselbe Reaktion von1a–c mit dem cyclischen Enolether5 liefert die diastereomeren Cycloaddukte6 und7 mitcis-anellierten Pyranringen. Reaktion von3 mit Schwefelsäure führt zu den 2-Hydroxy-3,4-dihydro-2H-pyran-5-nitrilen8 und9.

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Authors and Affiliations

  1. Department of Organic Chemistry, Jagiellonian University, PL-30060, Kraków, Poland

    K. Bogdanowicz-Szwed & A. Pałasz

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  1. K. Bogdanowicz-Szwed
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  2. A. Pałasz
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Bogdanowicz-Szwed, K., Pałasz, A. Hetero-Diels-Alder reaction of 3-aryl-2-benzoyl-2-propenenitriles with enol ethers. Synthesis of 2-alkoxy-3,4-dihydro-2H-pyran-5-carbonitriles. Monatsh Chem 128, 1157–1172 (1997). https://doi.org/10.1007/BF00807566

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  • DOI: https://doi.org/10.1007/BF00807566

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