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A series of new bisbrusatolyl and brusatolyl esters and related compounds were synthesized and tested for in vivo antileukemia activity against a quassinoid sensitive strain of P-388 lymphocytic leukemia in BDF1 mice. The bisbrusatolyl malonate, succinate, glutarate, adipate, and sebacate were as active or more active than brusatol. The C-3 esters of brusatol and bruceantin were also found to be as active or more active than brusatol or bruceantin in general. The free hydroxyl groups at C-11 and C-12 as well as the enone double bond in ring A of both bisbrusatolyl and brusatolyl esters are required for antileukemic activity. The presence of a double bond in the ester side chain contributes to the enhanced activity of these esters.
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