The syntheses of arene-fused prostacyclin analogs 2 and 3 are described. Rapid assembly of the tricyclic skeleton is achieved in a triply-convergent manner from oxazoline-bearing homocuprate 6b, homochiral ammonium salt Z and homochiral propargyl acetylide 12. Compound 2 was a potent inhibitor of collagen-induced platelet aggregation having an IC50 = 2.9nM; while 3 exhibited an IC50 = 52nM.