A series of novel podophyllotoxin (PDT) analogues was synthesized in which the lactone moiety was shifted to C ring. Some of the derivatives were also synthesized with modified A ring. Analogues 23 and 25 exhibited potent in vitro cytotoxicity against colon cancer (CaCO 2) cell line. p-Demethylated E-ring analogues exhibited better potency than the corresponding methylated analogues. These analogues showed toxicity comparable to ...
[Cueva, Juan Pablo; Chemel, Benjamin R.; Juncosa Jr., Jose I.; Lill, Markus A.; Watts, Val J.; Nichols, David E. European Journal of Medicinal Chemistry, 2012 , vol. 48, p. 97 - 107]