Syntheses of optically pure conduramines via the strategy of hetero Diels-Alder reaction of masked o-benzoquinones with homochiral nitroso dienophiles.

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.