4-HYDROXYTETRAHYDROPYRAN-2-ONES AND THE CORRESPONDING DIHYDROXYCARBOXYLIC ACID DERIVATIVES,SALTS AND ESTERS,PROCESS FOR THEIR PREPARATION,THEIR USE AS PHARMACEUTICALS,AND PHARMACEUTICAL PREPARATIONS AND PRECURSORS

摘要

Compounds of the formula I …… and the corresponding open-chain dihydroxy carboxylic acids of the formula II …… in which X, Y, R<1>, R<2>, R<3>, R<4>, R<5> have the stated meanings, and their pharmacologically acceptable salts with bases and their pharmacologically acceptable esters, process for the preparation of these compounds, their use as drugs, and pharmaceutical preparations are described. Also described are compounds of the formula III …… in which R<1>, R<2>, R<3>, R<4>, R<5>, X and Y have the stated meanings.