Well-Defined Four-Coordinate Iron(II) Complexes For Intramolecular Hydroamination of Primary Aliphatic Alkenylamines†
Dr. Elise Bernoud‡,
Dr. Pascal Oulié‡,
Dr. Régis Guillot,
Dr. Mohamed Mellah and
Dr. Jérôme Hannedouche*
Article first published online: 1 APR 2014
DOI: 10.1002/anie.201402089
© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Abstract
Despite the growing interest in iron catalysis and hydroamination reactions, iron-catalyzed hydroamination of unprotected primary aliphatic amines and unactivated alkenes has not been reported to date. Herein, a novel well-defined four-coordinate β-diketiminatoiron(II) alkyl complex is shown to be an excellent precatalyst for the highly selective cyclohydroamination of primary aliphatic alkenylamines at mild temperatures (70–90 °C). Both empirical kinetic analyses and the reactivity of an isolated iron(II) amidoalkene dimer, [LFe(NHCH2CPh2CH2CHCH2)]2 favor a stepwise σ-insertive mechanism that entails migratory insertion of the pendant alkene into an iron–amido bond associated with a rate-determining aminolysis step.
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