Abstract
Bis(imidazotetrazine)s (16), related in structure to the antitumour agents mitozolomide (1a) and temozolomide (1b), but linked through the N(3)–N(3′) atoms of the imidazo[5,1-d][1,2,3,5]tetrazine ring-systems, are prepared by interaction of 5-diazoimidazole-4-carboxamide (8) and diisocyanates (15). The presence of the polymethylene linker with/without sulfur and oxygen heteroatoms does not substantially affect the acid stability, base-catalysed decomposition, antitumour activity or DNA base alkylation preference characteristic of the unlinked imidazotetrazines mitozolomide and temozolomide.
Published Version
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