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1.  (E)-17β,19-Epoxy­methano-17,23,24-tridemethyl-4-nor-5β,18α-olean-3-one oxime 
In the penta­cyclic triterpenoide skeleton of the title mol­ecule, C27H43NO2 [systematic name: (3E,3aS,5aR,5bR,7aR,11R,11aR,11bR,13aR,13bR)-5a,5b,10,10,13b-penta­methyl­icosa­hydro-1H-11,7a-(epoxy­methano)cyclo­penta­[a]chrysen-3-one oxime], the five-membered ring A has an envelope conformation, while the six-membered rings B–E adopt chair conformations. Rings A and B are cis-fused. The hydroximino group has an E configuration. Strong inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into helical chains.
doi:10.1107/S1600536809016675
PMCID: PMC2969752  PMID: 21583127
2.  Synthesis and HIV-1 Integrase Inhibitory Activity of Spiroundecane(ene) Derivatives 
Fifteen 2,4-dioxaspiro[5.5]undecane ketone and 2,4-dioxa-spiro[5.5]undec-8-ene (spiroundecane(ene)) derivatives were synthesized using the Diels-Alder reaction. Inhibition of human immunodeficiency virus integrase (IN) was examined. Eight spiroundecane(ene) derivatives inhibited both 3’-processing and strand transfer reactions catalyzed by IN. SAR studies showed that the undecane core with at least one furan moiety is preferred for IN inhibition. Moreover, crosslinking experiments showed that spiroundecane derivatives did not affect IN-DNA binding at concentrations that block IN catalytic activity, indicating spiroundecane derivatives inhibit preformed IN-DNA complex. The moderate toxicity of spiroundecane(ene) derivatives encourages the further design of therapeutically relevant analogues based on this novel chemotype of IN inhibitors.
doi:10.1016/j.bmcl.2006.11.094
PMCID: PMC1899478  PMID: 17189685
3.  Synthesis and Pro-Apoptotic Activity of Novel Glycyrrhetinic Acid Derivatives 
Chembiochem  2011;12(5):784-794.
Triterpenoids are used for medicinal purposes in many countries. Some, such as oleanolic and glycyrrhetinic acids, are known to be anti-inflammatory and anticarcinogenic. However, the biological activities of these naturally occurring molecules against their particular targets are weak, so the synthesis of new synthetic analogues with enhanced potency is needed. By combining modifications to both the A and C rings of 18βH-glycyrrhetinic acid, the novel synthetic derivative methyl 2-cyano-3,12-dioxo-18βH-olean-9(11),1(2)-dien-30-oate was obtained. This derivative displays high antiproliferative activity in cancer cells, including a cell line with a multidrug-resistance phenotype. It causes cell death by inducing the intrinsic caspase-dependent apoptotic pathway.
doi:10.1002/cbic.201000618
PMCID: PMC3085123  PMID: 21328513
antitumor agents; apoptosis; biological activity; glycyrrhetinic acid derivatives; medicinal chemistry

Results 1-3 (3)