ISOINDOLO-QUINOXALINE DERIVATIVES HAVING ANTITUMOR ACTIVITY, PROCESS FOR THEIR PRODUCTION AND THEIR USE

New isoindolo[2,1-a]quinoxaline derivatives of general formula (1 ), wherein R represents H or OH and R5 represents H or CN, have been prepared with simple procedures starting from known intermediates and resulted to posses potent in vitro antitumor activity against a panel of about 60 different human tumor cell lines belonging to several kinds of tumors, both hematological and solid. Preparations containing such derivatives as active ingredients are proposed as drugs to be employed in cancer therapy both alone and in combination with other chemotherapeutics.