General Approach to Prostanes B<sub>1</sub>by Intermolecular Pauson-Khand Reaction: Syntheses of Methyl Esters of Prostaglandin B<sub>1</sub>and Phytoprostanes 16-B<sub>1</sub>-PhytoP and 9-L<sub>1</sub>-PhytoP
esters of Prostaglandin B1 and Phytoprostanes 16-B1-PhytoP (PPB1-I) and 9-L1-PhytoP (PPB1-II) based on the modified Julia olefination of a formylcyclopentenone and an appropriately protected hydroxy sulfone has been developed. The cyclopentenones were efficiently prepared by intermolecular Pauson–Khand reaction of a (silyloxymethyl)alkyne. The sulfone counterpart was prepared by regioselective ring-opening