Metallation of diazines.<b>V</b>. Synthesis of analogues of biologically active molecules
作者:N. Plé、A. Turck、F. Bardin、G. Queguiner
DOI:10.1002/jhet.5570290229
日期:1992.3
2-Chloro-4-methoxypyrimidine was lithiated by lithium 2,2,6,6-tetramethylpiperidide. The resulting lithio derivative was reacted with carbonyl derivatives and iodine. Synthesis of analogues of biologicallyactivemolecules is reported.
Synthesis of 14-Azacamptothecin, a Water-Soluble Topoisomerase I Poison
作者:Nicolas J. Rahier、Kejun Cheng、Rong Gao、Brian M. Eisenhauer、Sidney M. Hecht
DOI:10.1021/ol0400701
日期:2005.3.1
14-Azacamptothecin, a potent, water-soluble analogue of the antitumoragentcamptothecin, has been prepared by a convergent synthesis. The key condensation of the AB and DErings with concomitant formation of ring C of 14-aza CPT was carried out in two stages, the latter of which involved a radical cyclization strategy. [structure: see text]
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.