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Manganese-Catalyzed Intermolecular Oxidative Annulation of Alkynes with γ‑Vinyl Aldehydes: An Entry to Bridged Carbocyclic Systems
Manganese-catalyzed
intermolecular oxidative annulation of alkynes
with γ-vinyl aldehydes involving acylation and alkylation is
described, thus providing a scenario for the divergent synthesis of
bridged carbocyclic systems. By means of this manganese-catalyzed
alkyne dicarbofunctionalization strategy, three chemical bonds, including
two C–C bonds and one C–H bond, are formed via an aldehyde
CÂ(sp<sup>2</sup>)–H oxidative functionalization/[4 + 2] annulation/protonation
cascade