Reactivities of substituted α-phenyl-N-tert-butyl nitrones.
Reactivities of substituted α-phenyl-N-tert-butyl nitrones.
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取代的α-苯基-N-叔丁基硝酮的反应性。
DOI:
10.1021/jo501121g
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Durand,Grégory
中科院分区:
文献类型:
--
作者:
Rosselin,Marie;Choteau,Fanny;Zéamari,Kamal;Nash,KevinM;Das,Amlan;Lauricella,Robert;Lojou,Elisabeth;Tuccio,Béatrice;Villamena,FrederickA;Durand,Grégory
In this work, a series of α-phenyl-N-tert-butyl nitrones bearing one, two, or three substituents on thetert-butyl group was synthesized. Cyclic voltammetry (CV) was used to investigate their electrochemical properties and showed a more pronounced substituent effect for oxidation than for reduction. Rate constants of superoxide radical (O2•–) reactions with nitrones were determined using a UV–vis stopped-flow method, and phenyl radical (Ph•) trapping rate constants were measured by EPR spectroscopy. The effect ofN-tert-butyl substitution on the charge density and electron density localization of the nitronyl carbon as well as on the free energies of nitrone reactivity with O2•–and HO2•were computationally rationalized at the PCM/B3LYP/6-31+G**//B3LYP/6-31G* level of theory. Theoretical and experimental data showed that the rates of the reaction correlate with the nitronyl carbon charge density, suggesting a nucleophilic nature of O2•–and Ph•addition to the nitronyl carbon atom. Finally, the substituent effect was investigated in cell cultures exposed to hydrogen peroxide and a correlation between the cell viability and the oxidation potential of the nitrones was observed. Through a combination of computational methodologies and experimental methods, new insights into the reactivity of free radicals with nitrone derivatives have been proposed.
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影响因子:
5.6
作者:
S. Fuller;R. Capaldi;R. Henderson
通讯作者:
R. Henderson
DOI:
10.1111/j.1432-1033.1978.tb12564.x
发表时间:
1978
期刊:
European journal of biochemistry
影响因子:
--
作者:
Samuel H. P. Chan;Russell P. Tracy
通讯作者:
Russell P. Tracy
影响因子:
5.6
作者:
Richard Henderson;R. Capaldi;J. Leigh
通讯作者:
J. Leigh
DOI:
10.1016/s0021-9258(17)34732-4
发表时间:
1978
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
T. Frey;S. Chan;G. Schatz
通讯作者:
G. Schatz
影响因子:
3.9
作者:
Shuji Seki;Hideo Hayashi;Takuzo Oda
通讯作者:
Takuzo Oda