Abstract
Prostanoic acid (18) and 8-isoprostanoic acid (1) constitute the basic structures of primary prostaglandins and 8-isoprostaglandins. The conversion of commercially available (+)- and (-)-limonene to these compounds was accomplilshed by a sequence of reactions involving the Rh(I)-catalyzed cyclization of 3, 4-disubstituted 4-pentenals, which were easily prepared from (+)- or (-)-limonene, to cis-3, 4-disubstituted cyclopentanones and the appropriate modification of substituents on the five-membered ring.
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