The first syntheses of 9-J1-phytoprostane and 9-A1-phytoprostanemethylester were achieved enantioselectively using a divergent approach from a common intermediate sulfone 4. The divergence was accomplished using a sigmatropic rearrangement (swap protocol) to give sulfone 5 in 47 % overall yield. The two upper side-chains, with a stereodefined E double bond, were installed using consolidated Julia–Lythgoe
1,3-allylic transposition of the C-9 hydroxyl group of compound 13 has allowed the first total synthesis of J(2) isoprostane (1), a recently discovered member of the growing isoprostane family. This elusive compound opens up numerous new avenues for the molecular biology of cyclopentenoneprostaglandins which are endowed of intriguing biological effects such as antitumor, antiinflammatory, and antiviral