title: The Case for Development of 11-Aza-artemisinins for Malaria.
abstract: The current treatment regimens for uncomplicated malaria comprise an artemisinin in combination with another drug (ACT). However, the recent emergence of resistance to ACTs in South East Asia dramatically emphasizes the need for new artemisinins. The current artemisinins have been in use since the late 1970s and have relatively poor thermal, chemical and metabolic stabilities - all are metabolized or hydrolyzed in vivo to dihydroartemisinin (DHA) that itself undergoes facile decomposition in vivo. The current artemisinins possess neurotoxicity as demonstrated in animal models, an issue that mandates increased vigilance in view of trends to use of protracted treatment regimens involving sequential administration of different ACTs against the resistant disease. As artemisinins induce the most rapid reduction in parasitaemia of any drug, common sense dictates that any new artemisinin derivative, selected on the bases of more robust chemical and thermal stability, metabolic stability with respect to the generation of DHA in vivo, and relatively benign neurotoxicity should be used in any new ACT whose components are rationally chosen in order to counter resistant malaria and inhibit transmission. 11-Azaartemisinin and its N-substituted derivatives attract because of overall ease of preparation from artemisinin. Some derivatives also possess notable thermal stabilities and although metabolic pathways of the derivatives are as yet unknown, none can provide DHA. The azaartemisinins synthesized over the past 20 years are critically discussed on the basis of their synthetic accessibility and biological activities with the view to assessing suitability to serve as new artemisinin derivatives for treatment of malaria.
authors.forename: Rozanne
authors.initials: R
authors.lastname: Harmse
authors.forename: Ho Ning
authors.initials: HN
authors.lastname: Wong
authors.forename: Frans
authors.initials: F
authors.lastname: Smit
authors.affiliation: Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom 2520, South Africa. richard.haynes@nwu.ac.za.
authors.forename: Richard K
authors.initials: RK
authors.lastname: Haynes
authors.forename: David D
authors.initials: DD
authors.lastname: N'Da
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000962:Antimalarials / Q000138:chemical synthesis* / Q000737:chemistry / Q000627:therapeutic use; D037621:Artemisinins / Q000138:chemical synthesis / Q000737:chemistry / Q000627:therapeutic use; D015195:Drug Design; D006801:Humans; D008288:Malaria / Q000188:drug therapy*; D051379:Mice; D015394:Molecular Structure
chemical_list: D000962:Antimalarials; D037621:Artemisinins; C031327:artemisinin