In the synthesis of the title compound 12, the important intermediate 7 was obtained in good yield from the easily available ethyl 5, 5-ethylenedioxy-2-oxocyclohexane-1-carboxylate (1) via ring enlargement of the bicyclic enol ether 5 (Scheme). Its reduction (NaBH4 in EtOH) and subsequent protection with (t-Bu)Me2Si resulted in the highly functionalized ten-membered lactone 9. Introduction of the (Z)-configurated