PROCESS FOR PRODUCING 4-SUBSTITUTED ANTHRACYCLINONES, ANTHRACYCLINE GLICOSIDES AND PHARMACEUTICAL COMPOSITIONS COMPRISING THE LATTER AS ACTIVE INGREDIENT

摘要

4-substituted anthracyclinones of formula (I) wherein R represents a hydrogen atom or a straight or branched alkyl, alkenyl or alkynyl group having from 1 to 10 carbon atoms, are intermediates in the preparation of antitumor anthracycline glycosides of formula (IX): wherein R is as defined above and R1 is a hydrogen atom or a hydroxy group, and pharmaceutically acceptable salts thereof.