描述了一系列衍生自苄醇13的有机硫属元素(Se,Te)化合物的合成和表征。的关键前体二硫属化物的合成15,22,和29被实现邻-lithiation路线。通过二锂化衍生物14与Se(dtc)2的反应获得硒化物18。用H 2 O 2氧化15和22分别得到相应的环状酯衍生物17和24。硒化物的氧化18与H 2 O 2一起提供螺环化合物19。通过单晶X射线研究已经证明了二杀菌剂15和22中分子内相互作用的存在。环状化合物17和19也已经通过单晶X射线研究表征。已通过偶联生物测定法评估了GP X样硒化合物的抗氧化活性。双碲化物22在mPW1PW91级别的密度泛函理论计算已经确定了羟基氧和碲原子之间相当强的非键相互作用。通过NBO分析获得的二阶摄动能传达了n O →σ* Te - Te轨道重叠在非键相互作用中的参与。使用分子原子(AIM)方法进行波后功能分析,确定了15和22中不同的键临界点,并且还
Aromatic Derivatives and Tellurium Analogues of Cyclic Seleninate Esters and Spirodioxyselenuranes That Act as Glutathione Peroxidase Mimetics
摘要:
Several novel organoselenium and tellurium compounds were prepared and evaluated as mimetics of the selenoenzyme glutathione peroxidase, which protects cells from oxidative stress by reducing harmful peroxides with the thiol glutathione. The compounds were tested for catalytic activity in a model system wherein tert-butyl hydroperoxide or hydrogen peroxide were reduced with benzyl thiol and the rate of the reaction was measured by monitoring the formation of dibenzyl disulfide. Thus, aromatic derivatives 19, 22, 24, and 25 proved to be inferior catalysts compared to the parent cyclic seleninate ester 14 and spirodioxyselenurane 16. In the case of 19 and 22, this was the result of their rapid conversion to the relatively inert selenenyl sulfides 31 and 32, respectively. In general, hydrogen peroxide was reduced faster than tert-butyl hydroperoxide in the presence of the selenium-based catalysts. The cyclic tellurinate ester 27 and spirodioxytellurane 29 proved to be superior catalysts to their selenium analogues 14 and 16, respectively, resulting in the fastest reaction rates by far of all of the compounds we have investigated to date. Oxidation of 29 with hydrogen peroxide produced the unusual and unexpected peroxide 33, in which two hypervalent octahedral tellurium moieties are joined by ether and peroxide bridges. The structure of 33 was confirmed by X-ray crystallography. Although 33 displayed strong catalytic activity when tested independently in the model system, its relatively slow formation from the oxidation of 29 rules out its intermediacy in the catalytic cycle of 29.
Aromatic Derivatives and Tellurium Analogues of Cyclic Seleninate Esters and Spirodioxyselenuranes That Act as Glutathione Peroxidase Mimetics
作者:Thomas G. Back、Dušan Kuzma、Masood Parvez
DOI:10.1021/jo0512711
日期:2005.11.1
Several novel organoselenium and tellurium compounds were prepared and evaluated as mimetics of the selenoenzyme glutathione peroxidase, which protects cells from oxidative stress by reducing harmful peroxides with the thiol glutathione. The compounds were tested for catalytic activity in a model system wherein tert-butyl hydroperoxide or hydrogen peroxide were reduced with benzyl thiol and the rate of the reaction was measured by monitoring the formation of dibenzyl disulfide. Thus, aromatic derivatives 19, 22, 24, and 25 proved to be inferior catalysts compared to the parent cyclic seleninate ester 14 and spirodioxyselenurane 16. In the case of 19 and 22, this was the result of their rapid conversion to the relatively inert selenenyl sulfides 31 and 32, respectively. In general, hydrogen peroxide was reduced faster than tert-butyl hydroperoxide in the presence of the selenium-based catalysts. The cyclic tellurinate ester 27 and spirodioxytellurane 29 proved to be superior catalysts to their selenium analogues 14 and 16, respectively, resulting in the fastest reaction rates by far of all of the compounds we have investigated to date. Oxidation of 29 with hydrogen peroxide produced the unusual and unexpected peroxide 33, in which two hypervalent octahedral tellurium moieties are joined by ether and peroxide bridges. The structure of 33 was confirmed by X-ray crystallography. Although 33 displayed strong catalytic activity when tested independently in the model system, its relatively slow formation from the oxidation of 29 rules out its intermediacy in the catalytic cycle of 29.
<i>o</i>-Hydroxylmethylphenylchalcogens: Synthesis, Intramolecular Nonbonded Chalcogen···OH Interactions, and Glutathione Peroxidase-like Activity
作者:Santosh K. Tripathi、Upali Patel、Dipankar Roy、Raghavan B. Sunoj、Harkesh B. Singh、Gotthelf Wolmershäuser、Ray J. Butcher
DOI:10.1021/jo051309+
日期:2005.11.1
The synthesis and characterization of a series of organochalcogen (Se, Te) compounds derived from benzyl alcohol 13 are described. The synthesis of the key precursor dichalcogenides 15, 22, and 29 was achieved by the ortho-lithiation route. Selenide 18 was obtained by the reaction of the dilithiated derivative 14 with Se(dtc)2. Oxidation of 15 and 22 with H2O2 afforded the corresponding cyclic ester
描述了一系列衍生自苄醇13的有机硫属元素(Se,Te)化合物的合成和表征。的关键前体二硫属化物的合成15,22,和29被实现邻-lithiation路线。通过二锂化衍生物14与Se(dtc)2的反应获得硒化物18。用H 2 O 2氧化15和22分别得到相应的环状酯衍生物17和24。硒化物的氧化18与H 2 O 2一起提供螺环化合物19。通过单晶X射线研究已经证明了二杀菌剂15和22中分子内相互作用的存在。环状化合物17和19也已经通过单晶X射线研究表征。已通过偶联生物测定法评估了GP X样硒化合物的抗氧化活性。双碲化物22在mPW1PW91级别的密度泛函理论计算已经确定了羟基氧和碲原子之间相当强的非键相互作用。通过NBO分析获得的二阶摄动能传达了n O →σ* Te - Te轨道重叠在非键相互作用中的参与。使用分子原子(AIM)方法进行波后功能分析,确定了15和22中不同的键临界点,并且还