Abstract
The title compound was divided into three retrosynthetic segments, A, B and C, by disconnecting two C-C bonds at C- 14 15 and C- 27 28 . Synthesis of the segment C in the optically active natural form starting from a D-glucose derivatives is described. The key features are stereochemical control which includes a methodology named heteroconjugate addition involving carbon chain extension using carbanion stabilized by phenylsulfonyl group.
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