| abstract |
FIELD OF THE INVENTION The present invention relates to a novel process of optically active cis (la) and / or octahydro-indolo [2,3-a] quinolysine of the general formula: wherein R 'is a primary or secondary alkyl group having from 3 to 8 carbon atoms and R is a C1-C4 alkyl group prepared from a hexahydro-indolo [2,3-a] quinolizine salt of formula II wherein R2 is as defined above and X is an acid residue, by hydrogenation in the presence of a palladium-on-carbon catalyst such that hydrogenation in the presence of dimethylformamide. Θ ΊΓ -1- |