Stereoselective Synthesis of the DE Ring Portion of Kadcoccilactone A by a Radical Addition/Cyclization Approach

Abstract A stereoselective synthesis of the DE ring portion of kadcoccilactone A, triterpenoid isolated from Kadsura coccinea , has been achieved starting from a chiral building block, utilizing a photocatalytic decarboxylative addition/cyclization/fragmentation sequence to construct the five‐membered ring and intramolecular alkylation to create the quaternary stereocenter as key steps.