4-AMINOPYRIDINE DERIVATIVES Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: product: derivatives of 4-aminopyridine of the general formula (I) where A means group in which fragment CH at position "A" can be substituted with nitrogen atom; B means group (Ia) or (IIa) where broken line is nonobligatory double bond; R₃ hydrogen or fluorine at position "B"; Y₁ means CH₂, O or S; Y₂ means CH₂, CH, O or S; Y₃ means CH₂ or CH at condition that group (Ia) can contain double bond only if when Y₂ and Y₃ means CH, and at condition that when A means indicated group in which R₃ - hydrogen, and nitrogen is absent at position "A", only one of Y₁ and Y₂ means CH₂; q 1. EFFECT: improved method of synthesis. 3 cl, 1 tbl