With the aim of obtaining new antitumoral agents, a series of 5, 8-quinazolinediones was prepared. 5-Amino-6-methoxyquinazoline was oxidized by Fremy's salt to give 6-methoxy-5, 8-quinazolinedione. Nucleophilic substitution reaction at C6, electrophilic substitution at C7, and synthesis of 7-amino-6-methoxy-5, 8-quinazolinedione, the parent compound of streptonigrin, were studied. These compounds were tested for cytotoxic properties on ...