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Lymphomas (cancers of the lymphatic system) account for 12% of malignant diseases worldwide. Burkitt's lymphoma (BL) is a rare form of non-Hodgkin's lymphoma in which the cancer starts in the immune B-cells. We report the synthesis and preliminary studies on the antiproliferative activity of a library of 9,10-dihydro-9,10-ethanoanthracene based compounds structurally related to the antidepressant drug maprotiline against BL cell lines MUTU-1 and DG-75. Structural modifications were achieved by Diels-Alder reaction of the core 9-(2-nitrovinyl)anthracene with number of dienophiles including maleic anhydride, maleimides, acrylonitrile and benzyne. The antiproliferative activity of these compounds was evaluated in BL cell lines EBV - MUTU-1 and EBV + DG-75 (chemoresistant). The most potent compounds 13j , 15 , 16a , 16b , 16c , 16d and 19a displayed IC 50 values in the range 0.17-0.38 μM against the BL cell line EBV - MUTU-1 and IC 50 values in the range 0.45-0.78 μM against the chemoresistant BL cell line EBV + DG-75. Compounds 15 , 16b and 16c demonstrated potent ROS dependent apoptotic effects on the BL cell lines which were superior to the control drug taxol and showed minimal cytotoxicity to peripheral blood mononuclear cells (PBMCs). The results suggest that this class of compounds merits further investigation as antiproliferative agents for BL.

Design, Synthesis and Biochemical Evaluation of Novel Ethanoanthracenes and Related Compounds to Target Burkitt’s Lymphoma