申请人:Richter Gedeon Vegyeszeti Gyar Rt.
公开号:US04839362A1
公开(公告)日:1989-06-13
The invention relates to the preparation of cis and trans stereoisomers of racemic and optically active eburnamenine derivatives of the general formula (Ia) ##STR1## or (Ib), ##STR2## wherein R.sub.1 stands for a C.sub.1-4 alkyl group; and R stands for hydrogen, a C.sub.1-6 alkyl group, a C.sub.2-6 alkenyl group, an acyl or substituted acyl group, as well as their acid addition salts, of which the trans compounds are novel. The invention also relates to the compounds of the general formula (IIIa) ##STR3## and (IIIb), ##STR4## wherein R.sub.1 and R' represent a C.sub.1-4 alkyl group. The compounds of the general formulae (Ia) and (Ib) possess a vasodilatory effect which is substantially higher than that of pentoxifyllin, a known peripheral vasodilator.
本发明涉及制备具有一般式(Ia)##STR1##或(Ib)##STR2##的外消旋和光学活性eburnamenine衍生物的顺式和反式立体异构体,其中R.sub.1代表C.sub.1-4烷基基团;R代表氢、C.sub.1-6烷基基团、C.sub.2-6烯基基团、酰基或取代酰基基团,以及它们的酸加成盐。其中,反式化合物是新颖的。本发明还涉及一般式(IIIa)##STR3##和(IIIb)##STR4##的化合物,其中R.sub.1和R'代表C.sub.1-4烷基基团。一般式(Ia)和(Ib)的化合物具有明显高于已知的外周血管扩张剂pentoxifyllin的血管扩张作用。