Evaluation of Jatropha isabelli natural products and their synthetic analogs as potential antimalarial therapeutic agents
作者:Victor Hadi、Megan Hotard、Taotao Ling、Yandira G. Salinas、Gustavo Palacios、Michele Connelly、Fatima Rivas
DOI:10.1016/j.ejmech.2013.04.030
日期:2013.7
more selective analogs. Compounds 25 and 32 of this natural product–inspired compound library exhibited micromolar EC50 values against strains 3D7 and K1, thus providing a new antimalarial molecular scaffold. Our report describes an efficient derivatization approach used to evaluate the structure–activity relationship of jatrophone analogs in search of potential new antimalarialagents.
The absolute configuration of jatropholone A 1 and B 2, including the possibility to observe the vibrational circular dichroism (VCD) capacity to differentiate between two epimeric compounds in the presence of an inherently dissymmetric chromophore, which normally dominates VCD and electronic circular dichroism (ECD) spectra, followed after comparison of their experimental and DFT calculated VCD spectra, allowed us to conclude that although non-local (M/P) chirality generated by atropisomerism dominates over local chirality generated by an (R/S) change, the stereogenic center can confidently be assigned by VCD after DFT calculations. In addition, the absolute configurations of jatrophatrione 3 and citlalitrione 4, a compound proposed as a taxonomic marker for the genus Jatropha, were assigned by contrasting their respective calculated and experimental IR and VCD spectra. The evaluation of Flack and Hooft parameters obtained from the single-crystal X-ray diffraction data of jatropholone B acetate 6, and of 4 independently confirmed the absolute configurations of these molecules. (C) 2016 Elsevier Ltd. All rights reserved.