Structure−Activity Relationships of the Antimalarial Agent Artemisinin. 4. Effect of Substitution at C-3
作者:Mitchell A. Avery、Sanjiv Mehrotra、Jason D. Bonk、Jeffrey A. Vroman、D. Keith Goins、Robert Miller
DOI:10.1021/jm960200e
日期:1996.1.1
Novel antimalarial artemisinin analogs, 3-alkylartemisinins as well as 3-(arylalkyl)- and 3-(carboxyalkyl)artemisinins, were prepared via the synthetic intermediate 2. Formation of the N,N-dimethylhydrazones 5 and 24 and then regio- and chemoselective deprotonation followed by alkylation provided initially alkylated hydrazones that upon chromatography gave ketones 6-13 and 25-30. Direct ozonolysis of the ketones followed by in situ acidification lead directly to the formation of title compounds 14-21 and 31-36. The analogs were tested in vitro against W-2 and D-6 strains of Plasmodium falciparum and found to be in some cases much more active than the natural product (+)-artemisinin. The results were included in structure-activity relationship (CoMFA) studies for further analog design.