Benzothiopyranoindazoles, a New Class of Chromophore Modified Anthracenedione Anticancer Agents. Synthesis and Activity Against Murine Leukemias.

Reaction of the nitrothioxanthen-9-ones (I) with the aminoalkylhydrazine (II) gives the 5-nitrobenzothiopyranoindazoles (III) which are reduced, forming the corresponding amino compounds (IV).