DERIVATIVES OF 20,21-DINOREBURNAMENINE OR THEIR RACEMATES, OR THEIR ADDITIONAL SALTS WITH ORGANIC ACIDS SHOWING NOOTROPIC AND DEPRESSANT PROPERTIES Russian patent published in 1995 - IPC

FIELD: organic chemistry. SUBSTANCE: product: derivatives of 20,21-dinoreburnamenine of the formula (I) where R₁,R₂ and R₃ are independently H, halogen, C₁-C₅-alkyl or C₁-C₅-alkoxy, or NO₂ but R₁, R₂ and R₃ can not be simultaneously H, and where the group of the formulas (II) , , are their racemates, optical isomers or their salts with organic acids. Synthesized compounds were used in medicine. EFFECT: improved method of synthesis.