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Communication | Regular issue | Vol 51, No. 11, 1999, pp.2557-2560
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8697
Synthesis of 9-Ethoxycarbonyl-10(10aH)-oxo-5,6,7,8,8a,9-hexahydro-9,10a-anthracenecarbolactone and Related Compounds by Manganese(III) Mediated Cyclization

Shunsaku Ohta,* Takahiro Kajiura, Hiromichi Murai, Masayuki Yamashita, and Ikuo Kawasaki

*Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8412, Japan


Novel tetracyclic lactone (5a), 9-ethoxycarhonyl-10(10aH)-oxo-5,6,7,8,8a,9-hexahydro-9,10a-anthracenecarbolactone, was obtained in 34.8% yield by oxidative cyclization of diethyl trans-2-benzoylcyclohexylmalonate (4a) with manganese(III) acetate dihydrate in the presence of sodium acetate in acetic acid.