RACEMIC AND OPTICALLY ACTIVE OCTAHYDRO-INDOLO(2,3-A) TETRAHYDROPYRANYL (2,3-C) QUINOLIZINE DIESTER DERIVATIVES AND PROCESS FOR PREPARING THE SAME

摘要

New intermediate compounds are disclosed of the formula I, <IMAGE> Ia wherein R1 and R2 are independently alkyl having 1 to 4 carbon atoms, or acid-addition salts thereof of formula Ib, <IMAGE> Ib wherein X represents an acid residue, and a process for the preparation of the intermediate compounds.