14-Membered Macrocycles: Methyl trans-(10E)-5-Methyl-8-methylene-11,15-dioxobicyclo[12.3.0]heptadec-4-ene-14-carboxylate, (I), and Methyl trans-(2E,10E)-10-Methyl-7-methylene-4,17-dioxobicyclo[12.3.0]heptadeca-2,10-diene-1-carboxylate, (II)

A new series of functionalized 14-membered ring compounds were synthesized by an intramolecular Michael reaction. The structures of the title compounds (I) and (II) (C₂₁H₃₀O₄ and C₂₁H₂₈O₄, respectively) were determined by single-crystal X-ray diffraction in order to confirm their relative stereochemistries.

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