14-MEMBERED MACROCYCLES - METHYL DIOXOBICYCLO[12.3.0]HEPTADEC-4-ENE-14-CARBOXYLATE, (I), AND METHYL BICYCLO[12.3.0]HEPTADECA-2,10-DIENE-1-CARBOXYLATE, (II)
A new series of functionalized 14-membered ring compounds were synthes
ized by an intramolecular Michael reaction. The structures of the titl
e compounds (I) and (II) (C21H30O4 and C21H28O4, respectively) were de
termined by single-crystal X-ray diffraction in order to confirm their
relative stereochemistries.