Group 12 metal aryl selenolates. Crystal and molecular structure of [2-(Et2NCH2)C6H4]2Se2 and [2-(Me2NCH2)C6H4Se]2M (M=Zn, Cd)
摘要:
Diorganodiselenide [2-(Et2NCH2)C6H4](2)Se-2 (1) was obtained by hydrolysis/oxidation of the corresponding [2-(Et2NCH2)C6H4]SeLi derivative. The treatment of [2-(Et2NCH2)C6H4](2)Se-2 with elemental sodium in THF resulted in [2-(Et2NCH2)C6H4]SeNa (2). Reactions between alkali metal selenolates [2(R2NCH2)C6H4]SeM' (R = Me, Et; M' = Li, Na) and MCl2 (M = Zn, Cd) in a 2:1 molar ratio resulted in the [2-(R2NCH2)C6H4Se](2)M species [R = Me, M = Zn (3), Cd (4); R = Et, M = Zn (5), Cd (6)]. The new compounds were characterized by multinuclear NMR (H-1, C-13, Se-77, Cd-113) and mass spectrometry. The crystal and molecular structures of 1, 3 and 4 revealed monomeric species stabilized by N -> Se (for 1) and N -> M (for 3 and 4) intramolecular interactions. (C) 2010 Elsevier B. V. All rights reserved.
A Simple and Efficient Strategy To Enhance the Antioxidant Activities of Amino-Substituted Glutathione Peroxidase Mimics
作者:Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1002/chem.200800963
日期:2008.9.26
The glutathione peroxidase (GPx) activities of some diaryl diselenides incorporating tertiary amino groups were studied with H(2)O(2), Cum-OOH, and tBuOOH as substrates and with PhSH as thiol co-substrate. Simple replacement of a hydrogen atom with a methoxy group dramatically enhances the GPx activity. The introduction of methoxy substituents ortho to selenium in N,N-dialkylbenzylamine-based compounds
Fused tricyclic compounds as inhibitors of 17beta-hydroxysteroid dehydrogenase 3
申请人:Fink E. Brian
公开号:US20050250753A1
公开(公告)日:2005-11-10
Fused tricyclic compounds, methods of using such compounds in the treatment of hormone sensitive diseases such as prostate cancer, and pharmaceutical compositions containing such compounds.
融合三环化合物,使用这种化合物治疗激素敏感性疾病如前列腺癌的方法,以及含有这种化合物的药物组合物。
Enantiospecific Synthesis of <i>ortho</i>-Substituted Benzylic Boronic Esters by a 1,2-Metalate Rearrangement/1,3-Borotropic Shift Sequence
作者:Stefan Aichhorn、Raphael Bigler、Eddie L. Myers、Varinder K. Aggarwal
DOI:10.1021/jacs.7b05880
日期:2017.7.19
ortho-substituted benzylic boronic esters with formal 1,1′-benzylidene insertion into the C–B bond. The reaction occurs by a SN2′ elimination and 1,2-metalate rearrangement of the N-activated boronate complex to afford a dearomatized intermediate, which undergoes a Lewis-acid catalyzed 1,3-borotropic shift to afford the boronic ester products in high yield and with excellent enantiospecificity. The use of
已经研究了苄胺和硼酸酯之间的偶联反应。邻-Lithiated苄胺与硼酸酯反应,并且一个Ñ -activator,得到邻位与正规1,1'-亚苄基取代的插入苄硼酸酯到C-B键。该反应通过S N 2'的消除和N活化的硼酸酯络合物的1,2-金属化物重排而得到脱芳香化的中间体,该中间体经过路易斯酸催化的1,3-硼向转变以得到硼酸酯产物。高收率和优异的对映体特异性。使用富含对映体的α-取代的苄胺得到相应的具有高ee的仲硼酸酯。
Synthesis and Structure-Activity Correlation Studies of Secondary- and Tertiary-Amine-Based Glutathione Peroxidase Mimics
作者:Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1002/chem.200900818
日期:2009.9.28
In this study, a series of secondary‐ and tertiary‐amino‐substituted diaryl diselenides were synthesized and studied for their glutathioneperoxidase (GPx) like antioxidant activities with H2O2, cumene hydroperoxide, or tBuOOH as substrates and with PhSH or glutathione (GSH) as thiol cosubstrates. This study reveals that replacement of the tert‐amino groups in benzylamine‐based diselenides by sec‐amino
在这项研究中,合成了一系列仲和叔氨基取代的二芳基二硒化物,并研究了它们的谷胱甘肽过氧化物酶(GPx)的抗氧化活性,例如以H 2 O 2,枯烯氢过氧化物或t BuOOH为底物,以PhSH或谷胱甘肽为抗氧化剂。(GSH)作为硫醇共底物。这项研究表明,用仲氨基取代苄胺基二硒化物中的叔氨基可以显着增强芳族硫醇(PhSH)和GSH分析系统的催化活性。特别是,N-丙基和N-异丙基氨基取代的二硒化物的活性是相应的N,N的8-18倍当将GSH用作硫醇共底物时,在所有三个过氧化物系统中都使用基于二丙基胺和N,N-二异丙基胺的化合物。虽然催化机理仲丁基-氨基-取代的diselenides是类似于的叔基于胺的化合物,在一些关键中间体的稳定性和反应性的差异占在GPx的样活性的差异。观察到,在产生催化活性硒醇方面,仲氨基比叔氨基更好。这是由于在从基于仲胺的二硒化物衍生的硒烯基硫化物中不存在任何重要的硫醇交换反应。此外,硒酸(RSeO2
Tertiary amine-based glutathione peroxidase mimics: some insights into the role of steric and electronic effects on antioxidant activity
作者:Debasish Bhowmick、Govindasamy Mugesh
DOI:10.1016/j.tet.2012.09.020
日期:2012.12
In this work, several tertiary amine-based diaryl diselenides were synthesized and evaluated for their glutathioneperoxidase (GPx)-like antioxidantactivities using hydrogen peroxide, tert-butyl hydroperoxide and cumene hydroperoxide as substrates and thiophenol (PhSH) and glutathione (GSH) as co-substrates. A comparison of the GPx-like activity of 4-methoxy-substituted N,N-dialkylbenzylamine-based