Reductive Radical Annulation Strategy toward Bicyclo[3.2.1]octanes: Synthesis of <i>ent</i>-Kaurane and Beyerane Diterpenoids

Abstract

Here we report a general [3 + 2] radical annulation that allows the facile construction of bicyclo[3.2.1]octane motifs in <i>ent</i>-kaurane- and beyerane-type diterpenoids. This radical annulation is difficult to control but was realized by harnessing an unprecedented and counterintuitive effect of TEMPO. Eleven natural products with a wide array of oxidation states are easily prepared, demonstrating the powerful utility of this straightforward synthetic strategy.