Journal
STEROIDS
Volume 129, Issue -, Pages 17-23Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.steroids.2017.11.008
Keywords
Cholic acids; 1,2,4-Trioxolane; 1,2,4,5-Tetraoxane; Antimalarial activity
Funding
- Russian Foundation for Basic Research [09-03-00831, 10-03-90303, 16-03-00722]
- Russian Federation for young scientists [MD-3852.2009.3]
- Vietnamese Academy of Science and Technology [VAST 06.02/15-16]
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A series of new steroidal peroxides 3'-trifluoromethylated 1,2,4-trioxolanes and 1,2,4,5-tetraoxanes based on deoxycholic acid were prepared via the reactions of the Griesbaum coozonolysis and peroxycondensation, respectively. 1,2,4-Trioxolanes were synthesized by the interaction of methyl O-methyl-3-oximino-12a-acetoxydeoxycholate with CF3C(O)CH3 or CF3C(0)Ph and O-3 as the mixtures of four possible stereoisomers at ratios of 1:2:2:1 and in yields of 50% and 38%, respectively. The major diastereomer of methyl 12a-acetoxy-5.13-cholan24-oate-3-spiro-5'-(3'-methyl-3'-trifluoromethyl-r,2',4'-trioxolane) was isolated via crystallization of a mixture of stereoisomers from hexane and its (3S,3'R)-configuration was determined using X-ray crystallographic analysis. Peroxycondensation of methyl 3-bishydroperoxy-12a-acetoxy-deoxycholate with CF3C(0)CH3 or acetone led to 1,2,4,5-tetraoxanes in yields of 44% and 37%, respectively. Antimalarial activity of these new steroidal peroxides was evaluated in vitro against the chloroquine-sensitive (CQS) T96 and chloroquine-resistant (CQR) K1 strains of Plasmodium falciparum. Deoxycholic acid 3'-trifluoromethylated 1,2,4,5-tetraoxane demonstrated a good IC50 value against CQR-strain (IC50 (K1) = 7.6 nM) of P. falcipttrunt. Tetraoxane with the acetone subunit demonstrated the best results among all tested peroxides with an ICso value of 3 nM against the CQ-resistant K1 strain. In general, 1,2,4-trioxolanes of deoxycholic acid are less active than 1,2,4,5-tetraoxanes.
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