Bioinspired Total Synthesis of (+)‐Euphorikanin A

摘要

Abstract We have achieved a bioinspired total synthesis of (+)‐euphorikanin A, which possesses an intriguing and complex 5/6/7/3‐fused tetracyclic skeleton bearing a bridged [3.2.1]‐γ‐lactone moiety. Key transformations include stereoselective alkylation and aldol condensation to install the main stereocenters, an intramolecular nucleophile‐catalyzed aldol lactonization of carboxylic acid–ketone to assemble the five‐membered ring, a McMurry coupling to construct the seven‐membered ring, and a biomimetic benzilic acid type rearrangement to form the bridged [3.2.1]‐γ‐lactone moiety.