| 摘要 |
<p>1,3-DIOXAN-4-YLALKENOIC ACIDS This invention concerns novel 1,3-dioxan-4-yl-alkenoic and alkanoic acids of formula I wherein Ra is (1-6C)alkyl, halogeno-(1-6C)alkyl, Rb is hydrogen or as Ra, or Ra and Rb together form (2-5C)polymethylene or (2-4C)oxypolymethylene, n is 2,3 or 4, A is vinylene or ethylene, benzene ring B optionally bears a single substituent and the substituents at positions 4 and 5 of the dioxane ring have trans-relative stereochemistry; together with pharmaceutically acceptable salts, (1-6C)-alkyl esters and (1-6C)alkanesulphonamides thereof. The compounds of formula I are antagonists of thromboxane A2 and are of value in treating a variety of disease conditions. The invention also provides processes for the manufacture of, and pharmaceutical compositions of, the compounds of formula I.</p> |
