Highly stereoselective hetero Diels-Alder reactions of masked o-benzoquinones (MOBs) with homochiral nitroso dienophiles are described along with their application in the syntheses of (+)-ent-conduramine F-1, (+)-conduramine E-1, (-)-conduramine A-1, (+)-conduramine A-1 tetraacetate, and (-)-ent-conduramine A-1 tetraacetate.
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