... Attempts at macrolactonization under Shiina,(19) Trost,(20) or Keck(21) conditions were also fruitless. ... In summary, the synthesis of the cytotoxic, 14-membered macrolide aspergillide A in a stereoselective ... br, OH), 1724 (C═O) cm −1 ; HR ESMS m/z 277.1417 (M + Na + ), calcd ...