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Conjugate addition of the cuprate derived from 2-lithio-2,3-butadiene to 1-cylopentenecarbaldehyde, reaction with vinylmagnesium bromide, ring closing metathesis, and oxidation gives the cis-ring fused core of the anticancer agent ottelione A. Epimerization of the initial conjugate addition product and application of the same reactions as used for the ottelione A core, give the trans-ring fused core...
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