A New Carbacyclin Synthesis

Abstract
After opening of substituted Corey lactones by alkali, acidification and Jones oxidation to the γ-keto acids, reaction with triphenyl-(phenyliminovinylidene)-phosphorane afforded in 50% overall yield the corresponding unsaturated bicyclo[3.3.0]octane-1-one derivatives, which could be readily reduced to the saturated bicyclic ketones.

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