A synthetic route to (+)-isocarbacyclin starting from (-)-tricyclo[3.3.0.0$^{2.8}$]octan-3-one 6 is described. The key intermediate 4 has been synthesized from 6 by a sequential introduction of methoxycarbonyl group at C-12 and the oxygen functionality at C-9${alpha}$(PG numbering) for the construction of ${alpha}-and;{omega}$-side chain, and then converted to isocarbacyclin methyl ester 2.