Prostaglandin isosteres. 1. (8-Aza-, 8,10-diaza-, and 8-aza-11-thia)-9-oxoprostanoic acids and their derivatives.

A series of novel (8-aza-, 8,10-diaza-, and 8-aza-11-thia)-9-oxoprostanoic acids has been synthesized and evaluated for their ability to mimic the E series prostaglandins in stimulating cAMP formation in the mouse ovary and in binding to the rat kidney plasma prostaglandin receptor. 7-[2-(3-Hydroxyoctyl)-1,1,4-trioxo-3-thiazolidinyl]heptanoic acid markedly stimulates cAMP formation at reasonable pharmacological concentrations and avidly binds to the rat kidney prostaglandin receptor.