A. Kamal et al., SYNTHESIS OF RING-A-OPENED ISOPICROPODOPHYLLINS AS POTENTIAL DNA TOPOISOMERASE-II INHIBITORS, Bioorganic & medicinal chemistry letters, 4(12), 1994, pp. 1513-1518
Some representative ring-A-opened podophyllin lignans were synthesized
employing the Michael Initiated Ring Closure methodology. These ligna
ns exhibited considerable DNA topoisomerase II inhibition and were dev
oid of topoisomerase I inhibition.