Seleno‐Nucleobases and Their Water‐Soluble Ruthenium–Arene Half‐Sandwich Complexes: Chemistry and Biological Activity
摘要:
AbstractHalf‐sandwich organometallic ruthenium complexes of seleno‐nucleobases, 3 and 4, were synthesized and characterized. The structures of both complexes were determined by X‐ray crystallography and are the first crystal structures of ruthenium complexes with seleno‐nucleobases. Interestingly, 3 self‐assembles aided by adventitious water in DMF to give a tetranuclear square 3a·6H2O. Complex 4 is active against Jurkat and Molt‐4 cell lines but inactive against the K562 cell line, whereas 3 is completely inactive against all three cell lines. The free ligand 6‐selenopurine (1) and 6‐selenoguanine (2) are highly active against these cell lines. Compound 2, like its thio analogue, is unstable under UVA light, whereas 4 is stable under similar conditions, which suggests that the ruthenium complex could reduce problems associated with the instability of the free ligand, 2, under irradiation.
alkylating antitumor agents. In order to study the interaction of O6-benzylguanine derivatives with AGT and to obtain greater AGT depletion, we synthesized the following O6-arylmethylguanine derivatives and related compounds: O6-(4-, 3- and 2-fluorobenzyl)guanines (2, 3, 4), O6-(4-, 3- and 2-trifluoromethylbenzyl)guanines (5, 6, 7), O6-(4-, 3- and 2-pyridylmethyl)guanines (8, 9, 10), O6-(2- and 1-naphthylmethyl)guanines
Heavy-Atom-Substituted Nucleobases in Photodynamic Applications: Substitution of Sulfur with Selenium in 6-Thioguanine Induces a Remarkable Increase in the Rate of Triplet Decay in 6-Selenoguanine
作者:Kieran M. Farrell、Matthew M. Brister、Michael Pittelkow、Theis I. Sølling、Carlos E. Crespo-Hernández
DOI:10.1021/jacs.8b07665
日期:2018.9.12
and compared to that of the 6-thioguanine prodrug. Selenium substitution leads to a remarkable enhancement of the intersystemcrossing lifetime both to and from the triplet manifold, resulting in an efficiently populated, yet short-lived triplet state. Surprisingly, the rate of triplet decay in 6-selenoguanine increases by 835-fold compared to that in 6-thioguanine. This appears to be an extreme manifestation
The toxic effects of platinum compounds used in chemotherapy can be negated by the use of a selenium-containing compound. A new selenium-containing platinum compound has been found to be useful as a so-called platinum compound type anti-cancer medicine which can self-detoxify platinum toxicity.
Use of selenium-containing compounds for negating the toxic effects of
申请人:——
公开号:US04617189A1
公开(公告)日:1986-10-14
The toxic effects of platinum compounds used in chemotherapy can be negated by the use of a selenium-containing compound. A new selenium-containing platinum compound has been found to be useful as a so-called platinum compound type anti-cancer medicine which can self-detoxify platinum toxicity.