New 9,11-Ethano-7-oxo-13-thia Prostanoids

New 9,11-ethano analogs of prostaglandin endoperoxides containing a sulfur atom in position 13 were synthesized by nucleophilic addition of thiols at the polarized double bond of 2-acylbicyclo[2.2.1]hept-2-enes. Physicochemical properties and biological activity of the products were studied.