Phosphoric Acid Catalyzed Desymmetrization of Bicyclic Bislactones Bearing an All-Carbon Stereogenic Center: Total Syntheses of (−)-Rhazinilam and (−)-Leucomidine B
the presence of a catalytic amount of an imidodiphosphoric acid, enantioselective desymmetrization of bicyclicbislactones by reaction with alcohols took place smoothly to afford enantiomerically enriched monoacids having an all‐carbon stereogeniccenter. Concise catalytic enantioselective syntheses of both (−)‐rhazinilam and (−)‐leucomidine B were subsequently developed using (S)‐methyl 4‐ethyl‐4‐formylpimelate