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A flexible and efficient synthesis of the potent human topoisomerase inhibitor (5Z,9Z)‐eicosa‐5,9‐dienoic acid was explored; the presented method represents a generally applicable approach towards demospongic acids and related natural products. Key steps of the synthesis involve chemoselective hydroboration, Corey–Fuchs alkynylation, Z‐selective Lindlar reduction, tetrapropylammonium perruthenate...
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