The present invention relates to novel substituted indolo [2,3-a] quinolizines of the general formula (I)and stereoisomeric forms thereof and/or pharmaceutically acceptable salts of these compounds as well as pharmaceutical compositions containing at least one of these substituted indolo [2,3-a] quinolizines together with pharmaceutically acceptable carrier, excipient and/or diluents. Said novel substituted indolo [2,3-a] quinolizines have been identified as useful for the prophylaxis and treatment of cancer by the induction of strong mitotic delays, chromosomal misalignments and mitotic tri- and multipolarization leading to cell cycle stop and apoptosis. Furthermore a synthesis for preparation of the substituted indolo [2,3-a] quinolizines is disclosed in the present invention.
