在水性介质中,已经开发了一种通过使用Selectfluor作为氟源通过咪唑并吡啶的脱芳香基二官能化来进行二氟羟基化的有效途径。该反应通过离子进行,随后通过自由基途径进行。产物以纯净形式获得,无需柱纯化。该方法已成功用于3,3-二氟-2-(4-氟苯基)-2,3-二氢咪唑并[1,2 - a ]吡啶-2-醇(3m)的克级生产。唑来idine啶药物成功地以高收率进行了二氟羟基化反应。有趣的是,加入四正丁基卤化铵或NaI或KSCN或NaNO 2在该反应中,咪唑并吡啶具有氧化功能,其中Selectfluor起氧化剂的作用。以良好的产率制备了C-3取代的(Cl,Br,I,SCN和NO)咪唑并[1,2- a ]吡啶。这两个重要的反应提供了宽泛的官能团耐受性,无金属/无碱和绿色方法。
摘要 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。
The present invention provides pharmaceutical compositions containing benzene compound(s) represented by General Formula (1) below and, particularly, LPL-activating compositions for use in hyperlipidemia therapeutic and preventive agents, anti-obesity agents, and the like:
wherein R
1
, R
2
, R
3
and R
4
are as defined in the specification.
An electrochemical oxidative homo-coupling reaction of imidazopyridine heterocycles to biheteroaryls
作者:Yongyuan Gao、Yang Wang、Jie Zhou、Haibo Mei、Jianlin Han
DOI:10.1039/c7gc03563b
日期:——
An electrochemical dehydrogenative homo-coupling reaction of imidazopyridine-based heterocycles has been developed, which affords biheteroaryls with good chemical yields and high regioselectivities. This reaction is conducted in a simple undivided cell at room temperature, which avoids the use of any metal-catalysts, additives and oxidants. This reaction tolerates a wide scope of substrates, which
Visible-light-mediated C3-azolylation of imidazo[1,2-a]pyridines with 2-bromoazoles
作者:Qing Chang、Zhongjie Wu、Lu Yu、Ping Liu、Peipei Sun
DOI:10.1039/c7ob00883j
日期:——
The C3-azolylation of imidazo[1,2-a]pyridines was developed via a visible light-mediated reaction of imidazopyridines with 2-bromoazoles catalyzed by Ir(ppy)2(dtbbpy)PF6 under mild conditions. For the imidazo[1,2-a]pyridines with various substituents on benzene or the pyridine ring and a variety of azoles, the reaction proceeded smoothly to give 3-(azol-2-yl)imidazo[1,2-a]pyridines in moderate to good
咪唑的C3-azolylation [1,2一]吡啶开发通过与由铱催化的(PPY)2-咪唑并吡啶bromoazoles的可见光介导的反应2(dtbbpy)PF 6在温和条件下。对于在苯或吡啶环上具有各种取代基的咪唑并[1,2- a ]吡啶和各种唑,反应进行得很顺利,得到了3-(azol-2-yl)咪唑并[1,2- a ]吡啶中等至良好的产量。
Methylene-Tethered Arylsulfonation and Benzotriazolation of Aryl/Heteroaryl C–H Bonds with DMSO as a One-Carbon Surrogate
作者:Saradhi Kalari、Akash U. Shinde、Haridas B. Rode
DOI:10.1021/acs.joc.1c01914
日期:2021.12.17
The Selectfluor-mediated approach toward the synthesis of methylene-tethered arylsulfonation and benzotriazolation of imidazopyridines has been described. The reaction involves imidazopyridine, aryl sulfinate, or benzotriazole and dimethyl sulfoxide (DMSO) in the presence of Selectfluor, where DMSO acts as a one-carbon synthon. The protocol has been extended to the methylene-tethered arylsulfonation
efficient Cu-catalyzed method for direct C–N bond formation on the C-3 position of imidazo[1,2-a]pyridines is reported. The robust copper catalyst tolerated a wide range of functional groups and set the stage for the synthesis of diversely decorated imidazo[1,2-a]pyridines. Preliminary experimental results show that the reaction mechanism is consistent with C-3 radical functionalization.
报道了一种在咪唑并[1,2- a ]吡啶的C-3位置直接形成CN键的有效Cu催化方法。坚固的铜催化剂可耐受各种官能团,并为合成各种装饰的咪唑并[1,2- a ]吡啶奠定了基础。初步实验结果表明,该反应机理与C-3自由基官能化相一致。