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Catalytic Reductive [4 + 1]-cycloadditions of Vinylidenes and Dienes

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Journal Science
Specialty Science
Date 2019 Feb 23
PMID 30792299
Citations 31
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Abstract

Cycloaddition reactions provide direct and convergent routes to cycloalkanes, making them valuable targets for the development of synthetic methods. Whereas six-membered rings are readily accessible from Diels-Alder reactions, cycloadditions that generate five-membered rings are comparatively limited in scope. Here, we report that dinickel complexes catalyze [4 + 1]-cycloaddition reactions of 1,3-dienes. The C partner is a vinylidene equivalent generated from the reductive activation of a 1,1-dichloroalkene in the presence of stoichiometric zinc. Intermolecular and intramolecular variants of the reaction are described, and high levels of asymmetric induction are achieved in the intramolecular cycloadditions using a -symmetric chiral ligand that stabilizes a metal-metal bond.

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