METHOD FOR PREPARING DERIVATIVES OF 4-OXOQUINOLINE OR CHROMAN OR THEIR PHARMACEUTICALLY ACCEPTABLE SALTS Russian patent published in 1995 - IPC

FIELD: medicine. SUBSTANCE: desired products have formula I R₁ where NR₃B, X, Y and B have appropriate values. Amine R₃ having formula II where R₁ and B have appropriate values is used as reagent I. Compound having formula III where and X have appropriate values or its acylation derivative is used as reagent 2. Desired compound is isolated in free state or as pharmaceutically acceptable salt. Compound having formula I may be oxidized producing N-oxide, or salt of compound I may be converted into free base, or free base is converted into pharmaceutically acceptable salt. EFFECT: improves efficiency of the method. 1 tbl