Indazole N-oxide derivatives as antiprotozoal agents: Synthesis, biological evaluation and mechanism of action studies
作者:Alejandra Gerpe、Gabriela Aguirre、Lucía Boiani、Hugo Cerecetto、Mercedes González、Claudio Olea-Azar、Carolina Rigol、Juan D. Maya、Antonio Morello、Oscar E. Piro、Vicente J. Arán、Amaia Azqueta、Adela López de Ceráin、Antonio Monge、María Antonieta Rojas、Gloria Yaluff
DOI:10.1016/j.bmc.2006.01.007
日期:2006.5
A series of indazole N-oxide derivatives have been synthesized and their antichagasic and leishmanocidal properties studied. 3-Cyano-2-(4-iodophenyl)-2H-indazole N1-oxide exhibited interesting antichagasic activity on the two parasitic strains and the two parasitic stages evaluated. Furthermore, besides its trypanocidal activity, 3-cyano-2-(4-nitrophenyl)-2H-indazole N1-oxide showed leishmanocidal
Structure of indazole N1-oxide derivatives studied by X-ray, theoretical methods, 1H, 13C, 15N NMR and EI/MS
作者:Alejandra Gerpe、Oscar E. Piro、Hugo Cerecetto、Mercedes González
DOI:10.1016/j.molstruc.2007.02.002
日期:2007.12
A series of indazole N-1-oxide derivatives has been spectroscopically studied in solution using H-1, C-13, and N-15 NMR based on pulsed field gradient selected PFG H-1-X (X = C-13 and N-15) gHMQC and gHMBC experiments. Some indazoles were prepared using a new methodology to compare its spectral and structural data with the indazole N-1 -oxide parent compounds. The C-13 resonances of the indazole N-1-oxide carbon 3 and 7a demonstrate the N-oxide push-electron capability. The N-15 resonances of the indazole N-oxide, nitrogen 1, are near to 30 ppm more shielded than the corresponding values in the indazole heterocycle (deoxygenated form). Moreover, the structures of one indazole and one indazole N-oxide were unambiguously confirmed by X-ray crystallography. The solid state structures were contrasted with the theoretical ones obtained it? vacuo at different calculus level. The aromaticity of the derivatives was studied analyzing the H-H coupling constants of indazole's aromatic hydrogens and measuring C-C distances in the solid state. The fragmentation that takes place in EI/MS was gathered for all the indazole N-oxide derivatives and the general fragmentation pattern analyzed. (c) 2007 Elsevier B.V. All rights reserved.