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An intramolecular diels-alder approach to quassinoids—a stereoselective construction of a-aromatic klaineanone
Authors:Keiichiro Fukumoto  Masatoshi Chihiro  Yuichi Shiratori  Masataka Ihara  Tetsuji Kametani  Toshio Honda
Institution:1. Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980, Japan;2. Hoshi College of Pharmacy, Ebara 2-4-41, Shinagawa-ku, Tokyo 142, Japan
Abstract:Thermolysis of a benzocyclobutene derivative (20) prepared from norcamphor produced stereoselectively a tetracyclic compound (2), which was converted to a lactone (21) having correct stereochemistry at C7, C8, C9, C11, C13, and C14 positions of (±)-klaineanone.
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