Abstract
A stereoselective synthesis of the CDE ring portion of the antitumor saponin scillascilloside E-1 has been achieved, utilizing an Ireland-Claisen rearrangement to construct the contiguous tetrasubstituted stereocenters at C13 and C17 simultaneously and intramolecular nitrile oxide cycloaddition to form the five-membered ring as key steps.
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