Thermodynamic N-Donor trans Influence in Labile Pseudo-Octahedral Zinc Complexes: A Delusion?
摘要:
While the forces responsible for the chelate effect are well-established in coordination chemistry, the origin and implementation of the related thermodynamic trans influence remains debatable. This work illustrates a simple approach for quantifying this effect in labile pseudo-octahedral [Zn(Lk)(3)](2+) complexes lacking stereochemical preferences (Lk = L1L4 are unsymmetrical didentate a,a'-diimine ligands). In line with statistics, the triply degenerated meridional isomers mer-[Zn(Lk)(3)](2+) are stabilized by 0.8 = Delta G(exch)(mer)<= = 4.2 kJ/mol over their nondegenerated facial analogues fac-[Zn(Lk)(3)](2+) and therefore display no apparent trans influence at room temperature. However, the dissection of the free energy terms into opposite enthalpic (favoring the facial isomers) and entropic (favoring the meridional isomers) contributions reveals a trans influence assigned to solvation processes occurring in polar solvents. Altogether, the thermodynamic trans influence operating in [Zn(alpha,alpha'-diimine)(3)](2+) complexes is 12 orders of magnitude smaller than the chelate effect. A weak templating effect provided by a noncovalent lanthanide tripod is thus large enough to produce the wanted facial isomer at room temperature.
[EN] HEPATITIS B VIRAL ASSEMBLY EFFECTORS<br/>[FR] EFFECTEURS D'ASSEMBLAGE DE VIRUS DE L'HÉPATITE B
申请人:UNIV INDIANA RES & TECH CORP
公开号:WO2016168619A1
公开(公告)日:2016-10-20
Novel assembly effector compounds having a therapeutic effect against hepatitis B viral (HBV) infection are disclosed. Assembly effector molecules described herein can lead to defective viral assembly and also may affect other viral activities associated with chronic HBV infection. Also disclosed is a process to synthesize disclosed compounds, method of treatment of HBV by administration of disclosed compounds, and use of these compounds in the manufacture of medicaments against HBV.
The present invention provides 5-membered heterocycle compounds represented by the following general formula (I):
The present compounds have a superior acid secretion inhibitory effect, and shows an antiulcer activity and the like.
Exploration of pyrrole derivatives to find an effective potassium-competitive acid blocker with moderately long-lasting suppression of gastric acid secretion
drug, we tried to optimize the duration of action of the pyrrole derivative. Among the compounds synthesized, fluoropyrrole derivative 20j, which has a 2-F-3-Py group at position 5, fluorine atom at position 4, and a 4-Me-2-Py sulfonylgroup at the first position of the pyrrole ring, showed potent gastric acid-suppressive action and moderate duration of action in animal models. On the basis of structural
Targeting quinolone- and aminocoumarin-resistant bacteria with new gyramide analogs that inhibit DNA gyrase
作者:Katherine A. Hurley、Thiago M. A. Santos、Molly R. Fensterwald、Madhusudan Rajendran、Jared T. Moore、Edward I. Balmond、Brice J. Blahnik、Katherine C. Faulkner、Marie H. Foss、Victoria A. Heinrich、Matthew G. Lammers、Lucas C. Moore、Gregory D. Reynolds、Galen P. Shearn-Nance、Brian A. Stearns、Zi W. Yao、Jared T. Shaw、Douglas B. Weibel
DOI:10.1039/c7md00012j
日期:——
potent inhibitors of DNA gyrase and are activeagainst clinical strains of Gram-negativebacteria (Escherichia coli, Shigella flexneri, and Salmonella enterica; 3 of 10 wild-type strains tested) and Gram-positive bacteria (Bacillus spp., Enterococcus spp., Staphylococcus spp., and Streptococcus spp.; all 9 of the wild-type strains tested). E. coli strains resistant to the DNA gyrase inhibitors ciprofloxacin