Synthesis and in vitro pharmacology of 7-oxabicyclo[2.2.1]heptane analogs of thromboxane A2/PGH2

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Abstract
A series of chemically stable TXA2/PGH2 analogues modeled after the structure of the natural products was prepared in search of useful inhibitors of TXA2/PGH2-mediated pathophysiology. Each of the 16 isomers implied in structure 1 was prepared in chiral form and evaluated for activity in vitro in platelets and smooth muscle. Depending on relative side chain and carbinol stereochemistry, TXA2/PGH2 agonist and antagonist and, surprisingly, PGD2/PGI2 agonist activities were observed. The enantiomers possessing the .alpha. heterocycle shown in 1 were generally more potent than their mirror-image isomers.