Antimalarial activity of novel 1,2,5,6-tetraoxacycloalkanes and 1,2,5-trioxacycloalkanes.
Photooxygenation of 2-phenylnorbornene 1 in the presence of 30% aqueous hydrogen peroxide afforded 1,2-bishydroperoxide 3, which could be cycloalkylated on treatment with silver oxide and a 1,omega-diiodoalkane to provide the tricyclic peroxides 12. Trimethylsilylation of 3 followed by TMSOTf-catalyzed cyclocondensation with carbonyl compounds led to the formation of the tricyclic peroxides 14 containing a 1,2,4,5-tetroxepane structure. Photooxygenation of 1 in the presence of either unsaturated hydroperoxides or unsaturated alcohols followed by bis(collidine)iodine hexafluorophosphate promoted cyclization gave the corresponding cyclic peroxides 15-17. Several of these cyclic peroxides showed substantial antimalarial activity particularly in vitro.
Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama 700-8530, Japan.
Hye-Sook
HS
Kim
Khurshida
K
Begum
Naoki
N
Ogura
Yusuke
Y
Wataya
Yuji
Y
Nonami
Toyonari
T
Ito
Araki
A
Masuyama
Masatomo
M
Nojima
Kevin J
KJ
McCullough
D000818:Animals; D000962:Antimalarials / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D018360:Crystallography, X-Ray; D051379:Mice; D010545:Peroxides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D010963:Plasmodium falciparum / Q000187:drug effects; D014407:Tumor Cells, Cultured
D000962:Antimalarials; D019086:Bridged Bicyclo Compounds, Heterocyclic; D010545:Peroxides