Prostaglandin I2 (prostacyclin 1) is well-recognized to be the prototype of a new generation of antithrombotic drugsz Un-fortunately, the demonstrated hydrolytic instability imparted by the enol ether moiety of 1 under physiological conditions precludes the use of this material for the inhibition of platelet aggregatiom2 A number of analogues of 1 have been prepared and among the best pharmaceutical candidates is carbacyclin (2). 2-4 Previous syntheses ...