Straightforward Synthesis of 5-Bromopenta-2,4-diynenitrile and Its Reactivity Towards Terminal Alkynes: A Direct Access to Diene and Benzofulvene Scaffolds - Université de Rennes Access content directly
Journal Articles Chemistry - A European Journal Year : 2015

Straightforward Synthesis of 5-Bromopenta-2,4-diynenitrile and Its Reactivity Towards Terminal Alkynes: A Direct Access to Diene and Benzofulvene Scaffolds

Abstract

The high-yielding synthesis of 5-bromopenta-2,4-diynenitrile (BrC5N) was achieved for the first time. Its reactivity with triisopropylsilylacetylene and triisopropylsilylbutadiyne in the presence of copper and palladium as co-catalysts and diisopropylamine was evaluated. It revealed an unprecedented cascade reaction leading to a diene in one case and to a benzofulvene in the other case, with a unique structure. Both of them were characterized by X-ray crystallography, among other techniques. The mechanism of the reaction leading to the diene was investigated experimentally. Theoretical calculations at the DFT level suggest that the mechanism leading to the benzofulvene relies on a hexa-dehydro Diels–Alder (HDDA)-type of mechanism. This work constitutes an example of an unanticipated reactivity leading to an important increase of chemical complexity.

Dates and versions

hal-01133028 , version 1 (18-03-2015)

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Nicolas Kerisit, Loic Toupet, Paolo Larini, Lionel Perrin, Jean-Claude Guillemin, et al.. Straightforward Synthesis of 5-Bromopenta-2,4-diynenitrile and Its Reactivity Towards Terminal Alkynes: A Direct Access to Diene and Benzofulvene Scaffolds. Chemistry - A European Journal, 2015, 21 (16), pp.6042-6047. ⟨10.1002/chem.201500633⟩. ⟨hal-01133028⟩
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