Abstract
A three-step synthesis of a precursor to the C11-C23 segment of (-)-dictyostatin is described. The sequence features a sonication-assisted, enantioselective double hetero Diels-Alder (HDA) reaction catalyzed by Jacobsen's Cr(III) Schiff base catalyst, followed by a novel, highly diastereoselective Meerwein-Ponndorf-Verley (MPV) reduction of the hydropyranone subunits under kinetic control to yield the bis(axial alcohol) 4. Generalized studies of both the HDA and MPV methodologies are also described.
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