西亚试剂：Total Synthesis of the Lycopodium Alkaloid (+)-Serratezomin

Total Synthesis of the Lycopodium Alkaloid (+)-Serratezomine A

Aroop Chandra, Julie A. Pigza, Jeong-Seok Han, Daniel Mutnick and Jeffrey N. Johnston*

Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235-1822

The first total synthesis of (+)-serratezomine A is described. Key aspects of the synthesis include (a) the first deployment of free-radical-mediated vinyl amination (an intramolecular alkyne aminostannation) in a complex target synthesis, (b) the use of a β-stannyl enamine as the lynchpin for convergent assembly of the natural product backbone, (c) the use of an oxidative allylation promoted by cerium(IV) (CAN) to establish the all-carbon quaternary chiral center with the proper configuration, and (d) an intramolecular substitution reaction to form the sensitive bridging lactone. Overall, 15 steps (longest linear sequence) are required to prepare the natural product from a commercially available aldehyde, and assembly of the contiguous array of six stereocenters is accomplished with high stereocontrol.

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