Sulfur, selenium and tellurium containing amines act as effective carbonic anhydrase activators
作者:Damiano Tanini、Antonella Capperucci、Claudiu T. Supuran、Andrea Angeli
DOI:10.1016/j.bioorg.2019.03.062
日期:2019.6
A new series of β-aminochalcogenides were designed and synthesized to identify new carbonic anhydrase activator (CAA) agents as novel tools for the management of several neurodegenerative and metabolic disorders which represent a clinical challenge without effective therapies available. Some β-aminoselenides and β-aminotellurides showed effective CA activating effects and a potent antioxidant activity
nucleophiles, isocyanates selectively couple with selenols. Selenocarbamates exhibited thiol-peroxidase-like properties, enabling the reduction of hydrogen peroxide at the expense of thiols, which are converted into the corresponding disulfides. A series of control experiments suggested that the catalytic mechanism proceeds through a pathway, involving a H2O2-promoted transcarbamoylation reaction leading
硒醇在温和的无催化剂条件下与异氰酸酯反应,以良好的收率和高选择性生成硒代氨基甲酸酯,而不是潜在的竞争亲核加成。该方法能够结合多种官能团,从而提供对广泛的密集官能化硒代氨基甲酸酯的访问。在竞争性以杂原子为中心的亲核试剂存在下,异氰酸酯选择性地与硒醇偶联。硒氨基甲酸酯表现出类似硫醇过氧化物酶的特性,能够以硫醇为代价还原过氧化氢,硫醇被转化为相应的二硫化物。一系列控制实验表明催化机制通过一个途径进行,涉及 H 2 O 2- 促进氨基甲酰化反应,产生硫代氨基甲酸酯,同时释放具有催化活性的硒酸阴离子。通过过氧化物驱动的硫醇 - 硒醇交换,硒代氨基甲酸酯表现为具有硫醇过氧化物酶样活性的硒酸阴离子的等价物。
Iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation of indols with benzeneselenols
作者:Senling Guan、Yue Chen、Hongjie Wu、Runsheng Xu
DOI:10.1039/d0ra05922f
日期:——
An iron-catalyzed tandem reaction of C–Se bond coupling/selenosulfonation was developed. Starting from sample indols and benzeneselenols versatile biologically active 2-benzeneselenonyl-1H-indoles derivatives were efficiently synthesized. The reaction mechanism was studied by the deuterium isotope study and in situ ESI-MS experiments. This protocol features mild reaction conditions, wider substrate
Direct biocatalysed synthesis of first sulfur-, selenium- and tellurium- containing <scp>l</scp>-ascorbyl hybrid derivatives with radical trapping and GPx-like properties
作者:Damiano Tanini、Beatrice Lupori、Gianni Malevolti、Moira Ambrosi、Pierandrea Lo Nostro、Antonella Capperucci
DOI:10.1039/c9cc02427a
日期:——
6-O-l-Ascorbyl selenoesters, thioesters and telluroesters can be efficiently and directly prepared from l-ascorbic acid and suitable functionalised chalcogenoesters through lipase-catalysed transesterification reactions.
Simple and catalyst-free method for the synthesis of diaryl selenides by reactions of arylselenols and arenediazonium salts
作者:Renata A. Balaguez、Vanessa Gentil Ricordi、Camilo S. Freitas、Gelson Perin、Ricardo F. Schumacher、Diego Alves
DOI:10.1016/j.tetlet.2013.12.086
日期:2014.1
catalyst-free method to synthesize diaryl selenides by reaction of arenediazonium tetrafluoroborate salts with arylselenols, generated in situ by using diaryl diselenides and hypophosphorous acid (H3PO2), using THF as solvent. This is a direct nucleophilic aromatic substitution (SNAr) reaction performed with diaryl diselenides and arenediazoniumsalts bearing electron-withdrawing and electron-donating
我们在此描述一种简单且无催化剂的方法,该方法是通过使用二芳基二硒化物和次磷酸(H 3 PO 2),以四氢呋喃为溶剂,通过四氟硼酸芳族重氮鎓盐与芳基硒醇的反应来合成二芳基硒化物。这是直接的亲核芳族取代(SNAr)反应,使用带有吸电子和供电子基团的二芳基二硒化物和烯二唑鎓盐以中等至良好的收率提供相应的二芳基硒化物。