Chemistry - A European Journal

Cover image for Vol. 22 Issue 27

Editor: Neville Compton, Deputy Editors: Anne Deveson, Elisabeth Roedern

Impact Factor: 5.731

ISI Journal Citation Reports © Ranking: 2014: 22/157 (Chemistry Multidisciplinary)

Online ISSN: 1521-3765

Associated Title(s): Angewandte Chemie International Edition, Chemistry – An Asian Journal, ChemistryOpen, ChemistrySelect, ChemBioChem, ChemCatChem, ChemElectroChem, ChemMedChem, ChemPhysChem, ChemPlusChem, ChemSusChem, European Journal of Inorganic Chemistry, European Journal of Organic Chemistry

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Multiple and Highly Selective Alkyne–Isonitrile C−C and C−N Couplings at Group 4 Metallocenes

Multiple and Highly Selective Alkyne–Isonitrile C−C and C−N Couplings at Group 4 Metallocenes

Selective but strange: The reactions of titano-, zircono- and hafnocene alkyne complexes with 2-xylyl isonitrile afford enamine complexes, aza-metallacycloallenes, and/or fused heterometallacycles, depending on the metal, the Cp′ ligand, and the stoichiometry applied. The alkyne always takes part in the coupling reactions. Furthermore, the metallocene is successfully expelled from the tricyclic complex to yield a highly functionalized pyrrole.

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A Two-Component Alkyne Metathesis Catalyst System with an Improved Substrate Scope and Functional Group Tolerance: Development and Applications to Natural Product Synthesis

A Two-Component Alkyne Metathesis Catalyst System with an Improved Substrate Scope and Functional Group Tolerance: Development and Applications to Natural Product Synthesis

Ill-defined but well-behaved: Although oligomeric in nature, alkyne metathesis catalysts formed in situ by mixing of a trisamido molybdenum alkylidyne complex and an appropriate trisilanol were found highly tolerant of sensitive functional groups and protic sites. This notion is witnessed by the total syntheses of the sesquiterpene lactone manshurolide, the immunosuppressive cyclodiyne ivorenolide A, as well as by studies toward the quinolizidine alkaloid lythrancepine I (see scheme).

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