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Communication | Special issue | Vol 30, No. 2, 1990, pp.813-816
Published online, 1st January, 1970
DOI: 10.3987/COM-89-S110
Synthesis of Oxasteroidal Skeletons by (4+2) Type Cycloaddition of Coumarin and 6-Methyl-2-pyrone with Siloxydienes Mediated by t-Butyldinethylsilyl Triflate

Yong-gyun Lee, Yukinori Utsumi, Katsuo Ohkata, and Kin-ya Akiba*

*Department of Chemistry, Faculty of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan


A new simple methodology is described for the preparation of oxasteroidal skeletons containing a lactone ring via cycloaddition of 2-t-butyldimethylsiloxypyrylium triflate (2a,b) with siloxydienes (3).