Interactions of Antithyroid Drugs and Their Analogues with Halogens and their Biological Implications
摘要:
The selenium analogue of antithyroid drug methimazole (MSeI) reacts with molecular bromine to produce two different types of novel complexes depending upon the molar ratio of MSeI to Br-2 in the reaction medium: Dicationic diselenide complex with two Br- ions as counterions is produced in the reaction of MSeI with 0.5 equiv of Br-2 (MSeI/Br-2, 1.0:0.5), whereas a stable 10-Se-3 hypervalent "T-shaped" complex featuring a linear Br-Se-Br moiety was produced when MSeI was treated with Br-2 in an equimolar ratio (MSeI/Br-2, 1.0:1.0). A substitution at the free N-H group in MSeI alters its reactivity toward iodine/bromine. For example, the N,N-disubstituted selones exclusively produce the corresponding 10-Se-3 hypervalent "T-shaped" complexes in the reaction with I-2. In the presence of the lectoperoxidase/H2O2/I- system, N,N-dimethylimidazole-2-selone produces the corresponding dicationic diselenide with two I- counterions as the final metabolite. The formation of ionic species in these reactions is confirmed by single crystal X-ray diffraction studies and in some cases by Fourier transform-Raman spectroscopic investigations.
作者:Mainak Banerjee、Ramesh Karri、Kuber Singh Rawat、Karthick Muthuvel、Biswarup Pathak、Gouriprasanna Roy
DOI:10.1002/anie.201504413
日期:2015.8.3
Organomercurials including methylmercury are ubiquitous environmental pollutants and highly toxic to humans. Now it could be shown that N‐methylimidazole based thiones/selones having an N‐CH2CH2OH substituent are remarkably effective in detoxifying various organomercurials to produce less toxic HgE (E=S, Se) nanoparticles. Compounds lacking the N‐CH2CH2OH substituent failed to produce HgE nanoparticles
In contrast to thiones and selones, the S- and Se-protected compounds do not show any noticeable inhibition under identical experimental conditions. While the inhibition of LPO by MMI cannot be reversed by increasing the hydrogen peroxide concentration, the inhibition by MSeI can be completely reversed by increasing the peroxide concentration. Experimental and theoretical studies were performed on
Synthesis and biological activity of the antithyroid drug carbimazole (CBZ) and its analogues are described. The introduction of an ethoxycarbonyl group in methimazole and its selenium analogue not only prevents the oxidation to the corresponding disulfide and diselenide but also reduces the zwitterionic character. A structure-activity correlation in a series of CBZ analogues suggests that the presence of a methyl substituent in CBZ and related compounds is important for their antithyroid activity.
Inhibition of Lactoperoxidase-Catalyzed Oxidation by Imidazole-Based Thiones and Selones: A Mechanistic Study
作者:Gouriprasanna Roy、P. N. Jayaram、Govindasamy Mugesh
DOI:10.1002/asia.201300274
日期:2013.8
N‐disubstituted thiones and selones that contain an imidazole pharmacophore. The N,N‐disubstituted thiones do not show any inhibitory activity towards LPO‐catalyzed oxidation reactions, but their corresponding N,N‐disubstituted selones exhibit inhibitory activity towards LPO‐catalyzed oxidation reactions. Substituents on the N atom of the imidazole ring appear to have a significant effect on the inhibition of LPO‐catalyzed
在本文中,我们描述了一系列包含咪唑药效基团的N,N-二取代的硫酮和色氨酸的合成和仿生活性。N,N-二取代的硫酮对LPO催化的氧化反应没有任何抑制活性,但它们相应的N,N-二取代的紫杉醇对LPO的氧化反应具有抑制作用。咪唑环N原子上的取代基似乎对LPO催化的氧化和碘化反应的抑制具有显著作用。Selones 16,17,和19,其中包含甲基,乙基,和苄基的取代基,表现出对与IC LPO催化氧化反应类似的抑制活性50个24.4,22.5,和22.5μ值中号,分别。但是,它们的活性几乎比常用的抗甲状腺药甲巯咪唑(MMI)低三倍。与此相反,selone 21,其中包含A N CH 2 CH 2 OH取代基,显示出高抑制活性,具有的IC 50值的7.2μ中号,这是类似于MMI的。这些selones对LPO催化的氧化/碘化反应的抑制活性是由于它们能够通过催化还原H 2 O 2来降低共底物(H 2 O
Interactions of Antithyroid Drugs and Their Analogues with Halogens and their Biological Implications
作者:Gouriprasanna Roy、Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1021/cg101688v
日期:2011.6.1
The selenium analogue of antithyroid drug methimazole (MSeI) reacts with molecular bromine to produce two different types of novel complexes depending upon the molar ratio of MSeI to Br-2 in the reaction medium: Dicationic diselenide complex with two Br- ions as counterions is produced in the reaction of MSeI with 0.5 equiv of Br-2 (MSeI/Br-2, 1.0:0.5), whereas a stable 10-Se-3 hypervalent "T-shaped" complex featuring a linear Br-Se-Br moiety was produced when MSeI was treated with Br-2 in an equimolar ratio (MSeI/Br-2, 1.0:1.0). A substitution at the free N-H group in MSeI alters its reactivity toward iodine/bromine. For example, the N,N-disubstituted selones exclusively produce the corresponding 10-Se-3 hypervalent "T-shaped" complexes in the reaction with I-2. In the presence of the lectoperoxidase/H2O2/I- system, N,N-dimethylimidazole-2-selone produces the corresponding dicationic diselenide with two I- counterions as the final metabolite. The formation of ionic species in these reactions is confirmed by single crystal X-ray diffraction studies and in some cases by Fourier transform-Raman spectroscopic investigations.