Abstract
(+)-Ottelione A shows high antitubercular and antitumor activities. An enantioselective Diels-Alder reaction, catalyzed by the chiral oxazaborolidinium salt B, was employed to construct the cis-bicyclic core. 1,4-Reduction was achieved using an N-heterocyclic carbene derivative of Stryker’s reagent (G → H).
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