稳定的螺二氮杂硒脲和螺二氮杂碲烷的第一个例子是通过相应的二芳基硒化物和碲化物的氧化螺环化合成的,并进行了结构表征。螺二氮杂硒脲烷和螺二氮杂碲烷的 X 射线晶体结构表明,这些结构是扭曲的三角双锥 (TBP),带负电的氮原子占据顶端位置,两个碳原子和孤对硒/碲占据赤道位置。有趣的是,螺二氮杂碲烷在结晶过程中经历了自发的手性拆分,其对映体的绝对构型通过单晶 X 射线分析得到证实。详细的机理研究表明,通过硒氧化物和碲氧化物中间体环化成螺二氮杂硒脲和螺二氮杂碲烷。硫属元素氧化物通过羟基硫属元素脲中间体的参与逐步环化为相应的螺环化合物,螺环化反应的活化能按S>Se>Te的顺序降低。除了环化的合成、表征和机制外,还评估了新合成化合物的谷胱甘肽过氧化物酶 (GPx) 模拟活性。
稳定的螺二氮杂硒脲和螺二氮杂碲烷的第一个例子是通过相应的二芳基硒化物和碲化物的氧化螺环化合成的,并进行了结构表征。螺二氮杂硒脲烷和螺二氮杂碲烷的 X 射线晶体结构表明,这些结构是扭曲的三角双锥 (TBP),带负电的氮原子占据顶端位置,两个碳原子和孤对硒/碲占据赤道位置。有趣的是,螺二氮杂碲烷在结晶过程中经历了自发的手性拆分,其对映体的绝对构型通过单晶 X 射线分析得到证实。详细的机理研究表明,通过硒氧化物和碲氧化物中间体环化成螺二氮杂硒脲和螺二氮杂碲烷。硫属元素氧化物通过羟基硫属元素脲中间体的参与逐步环化为相应的螺环化合物,螺环化反应的活化能按S>Se>Te的顺序降低。除了环化的合成、表征和机制外,还评估了新合成化合物的谷胱甘肽过氧化物酶 (GPx) 模拟活性。
Various N-substituted benzisoselenazol-3(2H)-ones and their non-selenium-containing analogues have been synthesized and tested against selected viruses (HHV-1, EMCV and VSV) to determine the extent to which selenium plays a role in antiviral activity. The data presented here show that the presence of selenium is crucial for the antiviral properties of benzisoselenazol-3(2H)-ones since their isostructural analogues having different groups but lacking selenium either did not show any antiviral activity or their activity was substantially lower. The open-chain analogues of benzisoselenazol-3(2H)-ones—diselenides also exhibited high antiviral activity while selenides and disulfides were completely inactive towards model viruses.
An efficient copper-catalyzed synthesis of symmetrical bis(<i>N</i>-arylbenzamide) selenides and their conversion to hypervalent spirodiazaselenuranes and hydroxy congeners
by oxidation using aqueous hydrogenperoxide. (N-(1-Naphthyl)) spirodiazaselenurane is also structurally characterized by a single crystal X-ray study. Hydroxy-substituted spiroselenuranes have been prepared by careful demethylation of methoxy-substituted selenides followed by oxidation by hydrogenperoxide. Antioxidant properties for the decomposition of hydrogenperoxide and for the deactivation of
Synthesis, Structure, Spirocyclization Mechanism, and Glutathione Peroxidase-like Antioxidant Activity of Stable Spirodiazaselenurane and Spirodiazatellurane
作者:Bani Kanta Sarma、Debasish Manna、Mao Minoura、Govindasamy Mugesh
DOI:10.1021/ja908080u
日期:2010.4.21
mimetic activity of the newly synthesized compounds was evaluated. These studies suggest that the tellurium compounds are more effective as GPx mimics than their selenium counterparts due to the fast oxidation of the tellurium center in the presence of peroxide and the involvement of an efficient redox cycle between the telluride and telluroxide intermediate.
稳定的螺二氮杂硒脲和螺二氮杂碲烷的第一个例子是通过相应的二芳基硒化物和碲化物的氧化螺环化合成的,并进行了结构表征。螺二氮杂硒脲烷和螺二氮杂碲烷的 X 射线晶体结构表明,这些结构是扭曲的三角双锥 (TBP),带负电的氮原子占据顶端位置,两个碳原子和孤对硒/碲占据赤道位置。有趣的是,螺二氮杂碲烷在结晶过程中经历了自发的手性拆分,其对映体的绝对构型通过单晶 X 射线分析得到证实。详细的机理研究表明,通过硒氧化物和碲氧化物中间体环化成螺二氮杂硒脲和螺二氮杂碲烷。硫属元素氧化物通过羟基硫属元素脲中间体的参与逐步环化为相应的螺环化合物,螺环化反应的活化能按S>Se>Te的顺序降低。除了环化的合成、表征和机制外,还评估了新合成化合物的谷胱甘肽过氧化物酶 (GPx) 模拟活性。