https://www.selleckchem.com/pr....oducts/tiplaxtinin-p
The first total syntheses of three unusual norrisolide-type rearranged spongian diterpenes cheloviolene C, seconorrisolide B, and seconorrisolide C have been accomplished via a common intermediate through late stage ring-scissoring. The synthesis features a Wolff ring contraction for the synthesis of the trans-hydrindane system, and a crucial retro Diels-Alder reaction/intramolecular ene cyclization for the rapid stereoselective construction of the furo[2,3-b]furan system, which is commonly seen in rearranged spongian diterp
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