Total Synthesis of Celastrol, Development of a Platform to Access Celastroid Natural Products.

Andrew M Camelio, Trevor C Johnson, Dionicio Siegel

Journal of the American Chemical Society 2015 Sep 23

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Celastroid natural products, triterpenes, have been and continue to be investigated in clinical trials. Celastrol, and for that matter any member of the celastroid family, was prepared for the first time through chemical synthesis starting from 2,3-dimethylbutadiene. A triene cyclization precursor generated in 12 steps underwent a nonbiomimetic polyene cyclization mediated by ferric chloride to generate the generic celastroid pentacyclic core. In the cyclization, engagement of a tetrasubstituted olefin formed adjacent all carbon quaternary centers stereospecifically. With access to the carbocyclic core of the family of natural products, wilforic acid and wilforol A were prepared en route to racemic celastrol.

Citation

Andrew M Camelio, Trevor C Johnson, Dionicio Siegel. Total Synthesis of Celastrol, Development of a Platform to Access Celastroid Natural Products. Journal of the American Chemical Society. 2015 Sep 23;137(37):11864-7