Divergent synthesis of selenide-containing spirocarbocycles and phenanthrenes through Cu(OTf)2-promoted selenylation of alkyne-containing phenol-based biaryls†

A convenient and practical approach for the synthesis of selenylated spirocyclohexadienones and phenanthrenes through the Cu(OTf)₂-promoted, base-controlled selective selenylation of alkynes with diselenides under non-oxidative conditions is described. This reaction demonstrates excellent substrate compatibility and provides a series of aryl-selenide-substituted spirocarbocycles and phenanthrene molecules in moderate to high yields.