Synthesis of fusidic acid bioisosteres as antiplasmodial agents and molecular docking studies in the binding site of elongation factor-G
作者:Gurminder Kaur、Kawaljit Singh、Elumalai Pavadai、Mathew Njoroge、Marlene Espinoza-Moraga、Carmen De Kock、Peter J. Smith、Sergio Wittlin、Kelly Chibale
DOI:10.1039/c5md00343a
日期:——
Structural modifications through bioisosteric approach yielded fusidic acid analogues with 2–35 folds increase in antiplasmodial activity as compared to fusidic acid.
A pyridine adduct of bis(di-iso-butyldithiocarbamato-S,S′)cadmium(II): Multinuclear (13C, 15N, 113Cd) CP/MAS NMR spectroscopy, crystal and molecular structure, and thermal behaviour
作者:Tatyana A. Rodina、Alexander V. Ivanov、Andrey V. Gerasimenko、Maxim A. Ivanov、Anna S. Zaeva、Tatyana S. Philippova、Oleg N. Antzutkin
DOI:10.1016/j.ica.2011.01.006
日期:2011.3
Crystalline bis(N, N-di-iso-butyldithiocarbamato-S,S')(pyridine)cadmium(II) - adduct 1 was prepared and studied by means of multinuclear C-13, N-15, Cd-113 CP/MAS NMR spectroscopy, single-crystal X-ray diffraction and simultaneous thermal analysis (STA). In molecular structure 1, the cadmium atom coordinates with four sulphur atoms and one nitrogen atom of pyridine, forming a coordination polyhedron [CdS4N], whose geometry is an almost ideal tetragonal pyramidal (C-4v). The coordinated py molecule is in the apical position, while two structurally non-equivalent di-iso-butyldithiocarbamate ligands, playing the same terminal S,S'-chelating function, define the basal plane. To characterise additionally the structural state of the cadmium atom in this fivefold coordination, Cd-113 chemical shift anisotropy (CSA) parameters, delta(aniso) and eta, were calculated from experimental MAS NMR spectra that revealed an almost axially symmetric Cd-113 chemical shift tensor. From a combination of TG and DSC measurements taken under an argon atmosphere, we found that the mass of adduct 1 is lost in two steps involving initial desorption of coordinated py molecules with subsequent thermal destruction of liberated cadmium(II) di-iso-butyldithiocarbamate, with yellow-orange, fine-powdered solid CdS as the final product. (C) 2011 Elsevier B.V. All rights reserved.