Interphenylene 7-oxabicyclo[2.2.1]heptanes. SQ33,961: a new potent, long-acting thromboxane antagonist ☆

Abstract The synthesis and initial biological evaluation of a novel series of chiral interphenylene 7-oxabicyclo-[2.2.1]heptane TxA 2 antagonists with 4-amido oxazole omega chains is described. Within this series SQ 33,961 has been identified as a highly potent TxA 2 antagonist with an exceptionally long in vivo duration of action.