Synthesis, structure and biological activity of amide-functionalized titanocenyls: Improving their cytotoxic properties
作者:Li Ming Gao、Jaime Matta、Arnold L. Rheingold、Enrique Meléndez
DOI:10.1016/j.jorganchem.2009.09.016
日期:2009.12
Nine amide-functionalized titanocenyls have been synthesized and characterized by spectroscopic and analytical methods and the solid state structure of Cp(CpCO-NH-C6H4-OCF3)TiCl2 was determined by single crystal X-ray diffraction. X-ray analysis of Cp(CpCO-NH-C6H4-OCF3) TiCl2 showed that titanium is in a pseudo tetrahedral geometry and contains a Ti-O(amide) coordination. In principle, Ti-O coordination should provide more hydrolytic stability to the corresponding titanocenyls than titanocene dichloride. The cytotoxic activities of these amide-functionalized titanocenyls on HT-29 colon cancer cell line were determined by MTT assay to elucidate structure-activity relationship. All complexes were more cytotoxic than titanocene dichloride and there is no correlation between the para substituents on the phenyl ring and their cytotoxicities. (C) 2009 Elsevier B.V. All rights reserved.
A Modular and Efficient Synthesis of Functional Titanocenes
A modular synthesis of functional titanocenes featuring building blocks is described. The approach allows straightforward access to large numbers of structurally diverse titanocenes that are pertinent for catalysis, structural studies, and bioinorganic chemistry. Among the functional groups introduced are amino acids, sugars, and fluorescence labels that are attached to the cyclopentadienyl ligand as esters and amides.