Synthesis of thiaprostaglandin E1 derivatives.

Abstract
A series of new thiaprostaglandins, 4-thia-, 5-thia-, 6-thia- and 7-thiaprostaglandin E1 methyl esters was synthesized by a 3-component coupling process using a chiral common synthon, (R)-4-tert-butyldimethylsilyloxy-2-cyclopentenone. Among these thiaprostaglandins, 7-thiaprostaglandin E1 methyl ester showed the most potent platelet aggregation-inhibiting activity.