- New acyl derivatives of 3-aminofurazanes and their antiplasmodial activities
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An N-acylated furazan-3-amine of a Medicines for Malaria Venture (MMV) project has shown activity against different strains of Plasmodium falciparum. Seventeen new derivatives were prepared and tested in vitro for their activities against blood stages of two strains of Plasmodium falciparum. Several structure–activity relationships were revealed. The activity strongly depended on the nature of the acyl moiety. Only benzamides showed promising activity. The substitution pattern of their phenyl ring affected the activity and the cytotoxicity of compounds. In addition, physicochemical parameters were calculated (log P, log D, ligand efficiency) or determined experimentally (permeability) via a PAMPA. The N-(4-(3,4-diethoxyphenyl)-1,2,5-oxadiazol-3-yl)-3(trifluoromethyl)benzamide possessed good physicochemical properties and showed high antiplasmodial activity against a chloroquine-sensitive strain (IC50 (NF54) = 0.019 μM) and even higher antiplasmodial activity against a multiresistant strain (IC50 (K1 ) = 0.007 μM). Compared to the MMV compound, the permeability and the activity against the multiresistant strain were improved.
- Dolensky, Johanna,Hermann, Theresa,Hochegger, Patrick,Kaiser, Marcel,M?ser, Pascal,Saf, Robert,Seebacher, Werner,Weis, Robert
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- In vitro study and structure-activity relationship analysis of stilbenoid derivatives as powerful vasorelaxants: Discovery of new lead compound
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The development of vasorelaxant as the antihypertensive drug is important as it produces a rapid and direct relaxation effect on the blood vessel muscles. Resveratrol (RV), as the most widely studied stilbenoid and the lead compound, inducing the excellent vasorelaxation effect through the multiple signalling pathways. In this study, the in vitro vascular response of the synthesized trans-stilbenoid derivatives, SB 1-8e were primarily evaluated by employing the phenylephrine (PE)-precontracted endothelium-intact isolated aortic rings. Herein we report trans-3,4,4′-trihydroxystilbene (SB 8b) exhibited surprisingly more than 2-fold improvement to the maximal relaxation (Rmax) of RV. This article also highlights the characterization of the aromatic protons in terms of their unique splitting patterns in 1H NMR.
- Chan, Sock Ying,Loh, Yean Chun,Oo, Chuan Wei,Yam, Mun Fei
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- Highly chemoselective hydrogenation of active benzaldehydes to benzyl alcohols catalyzed by bimetallic nanoparticles
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By using novel Pd/Ni bimetallic nanoparticles as a catalyst, the active benzaldehydes were hydrogenated to the corresponding benzyl alcohols as unique products in practical quantitative yields. The undesired catalytic hydrogenolysis of the benzyl alcohol was inhibited completely. By using this hydrogenation as a key step, the total synthesis of the natural product gastrodin was achieved with less total steps and a higher total yield.
- Liu, Chulong,Bao, Hailin,Wang, Dingsheng,Wang, Xinyan,Li, Yadong,Hu, Yuefei
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p. 6460 - 6462
(2015/11/16)
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- Synthesis and antitumor evaluation of arctigenin derivatives based on antiausterity strategy
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A series of new (-)-arctigenin derivatives with variably modified O-alkyl groups were synthesized and their preferential cytotoxicity was evaluated against human pancreatic cancer cell line PANC-1 under nutrient-deprived conditions. The results showed that monoethoxy derivative 4i (PC50, 0.49 μM), diethoxy derivative 4h (PC50, 0.66 μM), and triethoxy derivative 4m (PC50, 0.78 μM) showed the preferential cytotoxicities under nutrient-deprived conditions, which were identical to or more potent than (-)-arctigenin (1) (PC50, 0.80 μM). Among them, we selected the triethoxy derivative 4m and examined its in vivo antitumor activity using a mouse xenograft model. Triethoxy derivative 4m exhibited also in vivo antitumor activity with the potency identical to or slightly more than (-)-arctigenin (1). These results would suggest that a modification of (-)-arctigenin structure could lead to a new drug based on the antiausterity strategy.
- Kudou, Naoki,Taniguchi, Akira,Sugimoto, Kenji,Matsuya, Yuji,Kawasaki, Masashi,Toyooka, Naoki,Miyoshi, Chika,Awale, Suresh,Dibwe, Dya Fita,Esumi, Hiroyasu,Kadota, Shigetoshi,Tezuka, Yasuhiro
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- Cyclic compounds and uses thereof
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Compounds of general formula (1) R1—X1—W—X2—Z1—Z2—R2 or salts thereof, exhibiting preventive and therapeutic effects against HIV infectious diseases wherein R1is an optionally substituted five- or six-membered ring group; X1is a free valency or the like; W is a divalent group represented by, e. g., general formula (2) (wherein A and B are each an optionally substituted five- to seven-membered ring; E1and E4are each optionally substituted carbon or the like; E2and E3are each oxygen or the like; and a and b are each a single bond or a double bond); X2is a divalent group constituting a straight chain moiety; Z1is a divalent cyclic group or the like; Z2is a free valency or the like; and R2is optionally substituted amino or the like.
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- CYCLIC COMPOUNDS AND USES THEREOF
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Compounds of general formula (1) or salts thereof, exhibiting preventive and therapeutic effects against HIV infectious diseases wherein R1 is an optionally substituted five- or six-membered ring group; X1 is a free valency or the like; W is a divalent group represented by, e. g., general formula (2) (wherein A and B are each an optionally substituted five-to seven-membered ring; E1 and E4 are each optionally substituted carbon or the like; E2 and E3 are each oxygen or the like; and a and b are each a single bond or a double bond); X2 is a divalent group constituting a straight chain moiety; Z1 is a divalent cyclic group or the like; Z2 is a free valency or the like; and R2 is optionally substituted amino or the like.
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- Enzymes in organic synthesis 51. Probing the dimensions of the large hydrophobic pocket of the active site of pig liver esterase
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The dimensions of the large hydrophobic pocket (H(L)) of the active site model of pig liver esterase (PLE) were probed using a series of aliphatic and phenylic malonates. Results from the hydrolyses of these new unnatural substrates permitted the extension of the H(L) pocket to give the new dimensions of 6.2 x 2.3 x 3.9 A for a total volume of ~56 A3.
- Provencher,Wynn,Jones,Krawczyk
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p. 2025 - 2026
(2007/10/02)
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