title: Steroidal geminal dihydroperoxides and 1,2,4,5-tetraoxanes: structure determination and their antimalarial activity.
abstract: Cholestane-derived gem-dihydroperoxides and tetraoxanes were synthesized starting from 5 alpha- and 5 beta-cholestan-3-ones by acid-catalyzed addition of hydrogen peroxide to the ketone. They were characterized by IR, NMR, and mass spectroscopy analysis aided by molecular mechanics calculations, and, in the instance of 5 beta-cholestane-3 alpha,3 beta-dihydroperoxide (6), by x-ray analysis. The synthesized compounds were tested in vitro against Plasmodium falciparum Sierra Leone (D6) and Indochina (W2) malaria clones. All compounds were inactive to both clones, with the exception of tetraoxane 7a, which exhibited modest activity toward D6 clone with IC50 = 155 nM.
authors.affiliation: Institute of Chemistry, Technology and Metallurgy, Belgrade, Yugoslavia.
authors.forename: N M
authors.initials: NM
authors.lastname: Todorović
authors.forename: M
authors.initials: M
authors.lastname: Stefanović
authors.forename: B
authors.initials: B
authors.lastname: Tinant
authors.forename: J P
authors.initials: JP
authors.lastname: Declercq
authors.forename: M T
authors.initials: MT
authors.lastname: Makler
authors.forename: B A
authors.initials: BA
authors.lastname: Solaja
mesh_terms: D000818:Animals; D000962:Antimalarials / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D002776:Cholestanes / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D015394:Molecular Structure; D010545:Peroxides / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D010963:Plasmodium falciparum / Q000187:drug effects; D013256:Steroids / Q000737:chemistry
chemical_list: D000962:Antimalarials; D002776:Cholestanes; D010545:Peroxides; D013256:Steroids