An halogen migration of iodine during the metalation of pyrimidines has been highlighted and a mechanism is proposed. An unusual halogen-lithium exchange with LTMP has been observed. A new synthetic route to Leshmaniacides using metalation and cross coupling reactions is described.
Synthesis and Biological Evaluation of 10,11-Methylenedioxy-14-azacamptothecin
作者:Mark A. Elban、Wenyue Sun、Brian M. Eisenhauer、Rong Gao、Sidney M. Hecht
DOI:10.1021/ol0611604
日期:2006.8.1
10,11-Methylenedioxy-14-azacamptothecin, a potent analogue of the antitumor agent camptothecin (CPT), has been prepared via a key condensation between AB and DE ring precursors. The biological testing of this compound validated a strategy for modulation of the off-rate of camptothecin analogues from the topoisomerase-DNA-CPT ternary complex via structural modification.