Journal ArticleDOI
Periselective intramolecular cycloaddition of allene-1,3-dicarboxylates. Unusual structural feature of [2 + 2] cycloadducts
Mitsutaka Yoshida,Yukari. Hidaka,Yoshiharu. Nawata,Jerzy M. Rudzinski,Eiji Osawa,Ken Kanematsu +5 more
TLDR
In this article, a cycloaddition intramoleculaire de pentadienedioates de methyle and cyclohexene-2yle donne des derives de naphto [1,8-bc] pyranne and de cyclobuta [de] benzopyranne.Abstract:
La cycloaddition intramoleculaire de pentadienedioates de methyle et cyclohexene-2yle donne des derives de naphto [1,8-bc] pyranne et de cyclobuta [de] benzopyranne dont la structure est confirmee par analyse RX. Etude de l'effet des substituants sur les niveaux d'energie HOMO/LUMO de l'allene par methode AM1read more
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Journal ArticleDOI
A new allenic Pauson-Khand cycloaddition for the preparation of α-methylene cyclopentenones
TL;DR: Alkynyl allenes undergo an intramolecular molybdenum-mediated Pauson-Khand cycloaddition to provide functionalized α-methylene cyclopentenones in one step as discussed by the authors.
Journal ArticleDOI
Thermal Intramolecular [2+2] Cycloaddition of Allenenes and Allenynes: Diastereoselective Access to Bicyclic Nitrogen Heterocycles
Journal ArticleDOI
Phenylsulfonyl ene-allenes as efficient precursors to bicyclic systems via intramolecular [2 + 2]-cycloaddition reactions.
TL;DR: Various phenylsulfonyl allene derivatives were prepared with double bonds tethered either to the alpha-position or the gamma-position of the allene, resulting in highly regio- and stereospecific thermal [2 + 2]-cycloaddition across the nonactivated cumulene double bond.
Journal ArticleDOI
Acid‐Catalyzed Intramolecular [2+2] Cycloaddition of Ene‐allenones: Facile Access to Bicyclo[n.2.0] Frameworks
Junfeng Zhao,Teck-Peng Loh +1 more
TL;DR: A highly efficient acid-catalyzed intramolecular [2+2] cycloaddition between the distal allenic double bond and unactivated alkene moieties, with excellent chemo-, regio-, and diastereoselectivities under very mild reaction conditions is described.