Synthetic Study on Sespendole, an Indole Sesquiterpene Alkaloid: Stereocontrolled Synthesis of the Sesquiterpene Segment Bearing All Requisite Stereogenic Centers

[摘要]：Stereocontrolled synthesis of a sesquiterpene segment with all requisite stereogenic centers for sespendole has been achieved. Synthetic features of our strategy involve (1) highly stereoselective [2,3]-Wittig rearrangement to obtain sterically congested quaternary carbon and (2) isomerization of a spiro epoxide into aldehyde with Cp2TiCl2/Mn in a highly stereoselective manner.

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