Hydroalkynylative cyclization of 1,6-enynes with terminal alkynes

Chem Sci. 2019 Jun 13;10(28):6863-6867. doi: 10.1039/c9sc02341k. eCollection 2019 Jul 28.

Abstract

A rhodium-catalyzed highly regio- and enantioselective hydroalkynylation, generating cis-hydrobenzofuranone-tethered enynes has been developed. The reaction proceeds with a selective head-to-head insertion and symmetry breaking Michael addition cascade. One product was produced from tens of possible isomers through precise control of chemo-, regio-, and stereoselectivities using a single rhodium catalyst. Notable features of this method include 100% atom-economy, mild reaction conditions and a very broad substrate scope.