[structure: see text] A concise approach to the eupomatilone family of lignans is presented. The strategy employs an intramolecularly competitive Ireland-Claisen rearrangement of a densely functionalized bis-allylic ester. The rearrangement serves both to construct the A-ring and to establish the stereochemistry at C(3) and C(4).
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Hong et al. (2001) studied this question.
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