New insights into 3-(aminomethyl)naphthoquinones: Evaluation of cytotoxicity, electrochemical behavior and search for structure–activity correlation
作者:Gustavo B. da Silva、Amanda P. Neves、Maria D. Vargas、José D.B. Marinho-Filho、Letícia V. Costa-Lotufo
DOI:10.1016/j.bmcl.2016.06.027
日期:2016.8
Herein we describe the structure-activity relationship of a large library of Mannich bases (MBs) synthesized from 2-hydroxy-1,4-naphthoquinone. In general, the compounds have shown high to moderate activity against the HL-60 (promyelocytic leukaemia) cell line with IC50 = 1.1-19.2 mu M. Our results suggest that the nature of the aryl moiety introduced in the structure of MBs by the aldehyde component is crucial to the cytotoxicity, and although the group originated from the primary amine has a lesser influence, aromatic ones were found to suppress the activity. Thus, MBs derived from salicylaldehydes or 2-pyridinecarboxaldehyde and aliphatic amines are the most active compounds. A satisfactory correlation of the E-pIIc versus IC50 (mu M) in dimethylsulfoxide was observed. The most cytotoxic MBs (Series a-c, derived from salicylaldehydes) showed the least negative E-pIIc values. Noteworthy, however, Series d (derived from 2-pyridinecarboxaldehyde) did not follow this correlation. They exhibited both the lowest IC50 and the most negative E-pIIc values, thus suggesting that other factors also influence the cytotoxicity of the MBs, such as lipophilicity, electronic distribution and hydrogen bonding. (C) 2016 Elsevier Ltd. All rights reserved.
Novel platinum(ii) complexes of 3-(aminomethyl)naphthoquinone Mannich bases: synthesis, crystal structure and cytotoxic activities
作者:Amanda P. Neves、Gustavo B. da Silva、Maria D. Vargas、Carlos B. Pinheiro、Lorenzo do C. Visentin、José D. B. M. Filho、Ana J. Araújo、Letícia V. Costa-Lotufo、Cláudia Pessoa、Manoel O. de Moraes
DOI:10.1039/c0dt00572j
日期:——
chlorido complexes 1a–5a have shown high to moderate cytotoxicactivities, complex 4a (R1 = n-heptyl) being more active than proligand HL4 against melanoma (IC50 = 6.4 and > 40 μmol L−1, respectively) and more active than cisplatin against all tested cell lines. Among the amine charged complexes only 4b and 5b have exhibited significant cytotoxicactivity against the tested cell lines, although they were