PYRANOBENZOXADIAZOLE DERIVATIVES OR THEIR PHARMACEUTICALLY ACCEPTABLE SALTS Russian patent published in 1996 - IPC

FIELD: organic chemistry. SUBSTANCE: product: derivatives of pyranobenzoxadiazole of the formula (I) where A - OH or -OC(O)CH₃, or A and B are bound together; B - H; if R₁-H then R₂-H,, -C(O)CH_3-nX_n or -C(O)CH_3-nX_n where X - F, Cl, Br or methyl, n = 0-3, or R₁ and R₂ together mean (CH₂)_m,, (CH₂)_m-1,, C(O), NR₃(CH₂)₂C(O),, (CH₂)_m-2NHC(O) or (CH₂)_m-2OC(O) where m = 4 or 5; R₃-H or methyl, or their pharmaceutically acceptable salts. LD(50)600 mg/kg, yield is 43-56%. Synthesized compounds were used in medicine. ???EFFECT: improved method of synthesis. 5 tbl