Affiliation:
1. School of Chemistry Monash University Clayton 3800 Victoria Australia
2. Institut für Chemie Technische Universität Chemnitz Straße der Nationen 62 09111 Chemnitz Germany
Abstract
AbstractHerein we report a catalytic enantioselective (3+2) annulation, in which a vinyl phosphonium intermediate serves as the 2‐carbon component. The reaction involves an α‐umpolung β‐umpolung coupling sequence, enabled by β‐haloacrylates and chiral enantioenriched phosphepine catalysts. The reaction shows good generality, providing access to an array of cyclopentenes, with mechanistic studies supporting stereospecific formation of the vinyl phosphonium intermediate which, then undergoes annulation with turn over limiting catalyst elimination. Beyond defining a new approach to cyclopentenes, these studies demonstrate that β‐haloacrylates can replace ynoates in reaction designs that require exclusive umpolung coupling at the α‐ and β‐positions.
Funder
Australian Research Council
Deutsche Forschungsgemeinschaft
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