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    Preparation of tricyclic nitrogen heterocycle via Intramolecular Diels-Alder reaction
    (FREUND PUBLISHING HOUSE LTD, 2002) Demircan, A; Parsons, PJ
    Preparation of rigid tricyclic nitrogen heterocycles under radicalic condition has been studied. Cyclisation is performed by Diels-Alder ring closure after radicalic hydrogenation. We did not observe any radicalic Cycloaddition / Fragmentation product 12. Tri-n-butyltin hydride (TBTH) and azobisisobutyronitrile were used in toluene or benzene to generate radicalic condition. Intramolecular, Diels-Alder (IMDA) reaction on substituted furan species gave tricyclic heterocycle.
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    The synthesis of fused ring systems utilising the intramolecular addition of alkenyl radicals to furans
    (WILEY-V C H VERLAG GMBH, 2003) Demircan, A; Parsons, PJ
    Studies on the intramolecular addition of alkenyl radicals to furans are reported. The alkenyl radicals undergo a 5-exotrig addition to furans and the resulting spirocyclic intermediate can fragment to give substituted cyclopentene rings. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).