been carried out at room temperature through the functionalization of the sp2 C–Hbond employing Langlois reagent under ambient air. A library of 3-(trifluoromethyl)imidazo[1,2-a]pyridines with broad functionalities have been synthesized regioselectively. This methodology is also applicable to imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole.
咪唑并吡啶的氧化三氟甲基化反应已在室温下通过使用Langlois试剂对sp 2 C–H键进行官能化来进行。已经选择性地合成了具有广泛功能的3-(三氟甲基)咪唑并[1,2- a ]吡啶的文库。该方法也适用于咪唑并[2,1- b ]噻唑和苯并[ d ]咪唑并[2,1- b ]噻唑。
Copper-Catalyzed Synthesis of Imidazo[1,2-<i>a</i>]pyridines through Tandem Imine Formation-Oxidative Cyclization under Ambient Air: One-Step Synthesis of Zolimidine on a Gram-Scale
A new copper‐catalyzed oxidative cyclization via CH amination between 2‐aminopyridines and methyl aryl/heteroaryl ketones has been developed under ambient air. Imidazo[1,2‐a]pyridines containing a wide range of functional groups have been synthesized from basic and easily available starting materials. This simple, one‐pot reaction protocol is applicable for the direct preparation of zolimidine (a
一种新的铜催化的氧化环化经由Ç ħ胺化2-氨基吡啶和间甲基芳基/杂芳基酮已根据环境空气显影。含有多种官能团的咪唑并[1,2- a ]吡啶是从碱性且容易获得的起始原料合成的。这种简单的一锅法反应方案适用于大规模直接制备唑来咪定(市售的抗溃疡药)。
Iron(III)-catalyzed three-component domino strategy for the synthesis of imidazo[1,2-a]pyridines
An efficient, one-pot, three-component domino strategy has been demonstrated for the synthesis of imidazo[1,2-a]pyridines using a catalytic amount of Fe(III) chloride in high yields in air. A library of imidazo[1,2-a]pyridines was synthesized by the reaction of easily available aldehydes and 2-aminopyridines in a mixture of nitroalkane and DMF (2:1). This transformation presumably occurs by a sequential
已经证明了一种有效的单锅三组分多米诺骨牌策略,该策略用于在空气中高产率地使用催化量的氯化Fe(III)合成咪唑并[1,2- a ]吡啶。通过使易得的醛与2-氨基吡啶在硝基烷和DMF(2:1)的混合物中反应,合成了咪唑并[1,2- a ]吡啶文库。该转化大概是通过顺序的氮杂-亨利反应/环化/脱硝而发生的。使用容易获得的化学品作为起始原料,廉价的金属催化剂,好氧反应条件,宽泛的官能团耐受性和操作简便性是本方案的显着优势。
Metal-free TBHP-mediated oxidative ring openings of 2-arylimidazopyridines via regioselective cleavage of C–C and C–N bonds
作者:Kelu Yan、Daoshan Yang、Wei Wei、Guoqing Li、Mingyang Sun、Qingyun Zhang、Laijin Tian、Hua Wang
DOI:10.1039/c5ra17740e
日期:——
A highly regioselective TBHP-mediated ring opening of imidazopyridinesviacleavage of C–C and C–N bonds has been realized for the first time to afford usefulN-(pyridin-2-yl)benzamides under mild conditions.
Solvent and catalyst‐free synthesis of imidazo[1,2‐a]pyridines by grindstone chemistry
作者:Kumar Godugu、Chinna Gangi Reddy Nallagondu
DOI:10.1002/jhet.4164
日期:2021.1
The present work describes the solvent and catalyst‐free synthesis of imidazo[1,2‐a]pyridines in excellent to nearly quantitative yields from 2‐aminopyridines and a wide variety of ω‐bromomethylketones using a grindstone procedure at 25°C to 30°C for 3 to 5 minutes. The absolute structure of the compound, 2‐(3‐bromophenyl)‐7‐methylimidazo[1,2‐a]pyridine is determined by X‐ray crystallography. This