Total Syntheses of 11‐Acetoxy‐4‐deoxyasbestinin D, 4‐Deoxyasbestinin C, Asbestinin‐10, ‐20, ‐21 and ‐23

Six members of the asbestinin family of marine diterpene natural products have been synthesized in an efficient and stereoselective manner from a single oxa‐bridged intermediate. Five of these natural products have not been synthesized previously and the structures of four of them have been confirmed as those proposed originally or following revisions to the original structures. The fifth natural product—asbestinin‐21—has been shown to be a diastereomer of the compound that had been proposed previously.