摘要 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。
通过串联,一锅法(从Ortoleva-King反应开始),从2-氨基吡啶和苯乙酮到各种咪唑并[1,2- a ]吡啶的短而有效的途径。在检查了各种反应参数(溶剂,试剂比例和温度)后,确定了第一步的最佳条件。所确定的条件(第一步,纯净,2-氨基吡啶2.3当量,I 2 1.20当量,4 h,110°C;第二步,NaOH水溶液,1 h,100°C)导致咪唑[1]的形成。 ,2- a ]吡啶的产率为40-60%。该合成与各种功能(OH,NMe 2,Br,OMe)。包含2-(2'-羟苯基)取代基的产物在非极性和非质子惰性溶剂中经历激发态分子内质子转移(ESIPT)。尽管非极性溶剂中的ESIPT型发射微弱,但斯托克斯位移非常高(11000 cm –1)。六个具有ESIPT功能的咪唑并[1,2- a ]吡啶的性质比较表明,各种取代基对发射特性有影响。它们在蓝绿色黄区域也都显示出强大的固态发射。不能ESIPT的2-芳基-咪唑并[1
ethoxycarbonyl-difluoromethylation of imidazo[1,2-a]pyridines has been developed through sp2 C–Hbondfunctionalization with BrCF2CO2Et under ambient air. A series of ethoxycarbonyldifluoromethylated imidazo[1,2-a]pyridines with broad functionalities have been synthesized. This methodology is also applicable to imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole.
咪唑并[1,2- a ]吡啶在铜上的区域选择性铜催化的乙氧基羰基-二氟甲基化反应是通过在环境空气中用BrCF 2 CO 2 Et进行sp 2 C–H键官能化而开发的。合成了一系列具有广泛功能的乙氧基羰基二氟甲基化咪唑并[1,2- a ]吡啶。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。
Molecular iodine enabled generation of iminyl radicals from oximes: A facile route to imidazo[1,2-a]pyridines and its regioselective C-3 sulfenylated products from simple pyridines
作者:Deepak Singh、Soumyadeep Roy Chowdhury、Shyamal Pramanik、Soumitra Maity
DOI:10.1016/j.tet.2021.132125
日期:2021.5
2-a]pyridinesfrom unfunctionalized pyridines and oxime esters. This straightforward method efficiently converts the substrates into corresponding products affording moderate to good yields with large functional group tolerance. Additionally extensive investigation revealed that regioselective domino C-3 methyl sulfenylated imidazo[1,2-a]pyridines were also accessible first time frompyridines and
已经开发了碘促进的简单且环境友好的方案,以从未官能化的吡啶和肟酯中获得咪唑并[1,2- a ]吡啶。这种简单的方法可以有效地将底物转化为相应的产品,从而提供中等到良好的产率以及较大的官能团耐受性。另外,广泛的研究表明,在DMSO溶剂中,吡啶和肟酯类也可以首次获得区域选择性多米诺C-3甲基亚磺酰咪唑并[1,2- a ]吡啶。该反应通过容易获得的肟酯的无金属生成亚胺基进行,从而在吡啶上建立第二个杂环。
Bidentate BODIPY-appended 2-pyridylimidazo[1,2-a]pyridine ligand and fabrication of luminescent transition metal complexes
作者:Shasha Zhang、Wei Yuan、Yaru Qin、Jin Zhang、Ning Lu、Wei Liu、Hongkun Li、Yong Wang、Yahong Li
DOI:10.1016/j.poly.2018.03.023
日期:2018.7
Abstract One new molecular dyad 8-(2-(pyridine-2-yl)-imidazo[1,2-a]pyridine)-1,3,5,7-tetramethyl-4,4-difluoroboradiazaindacene (PyIP-BODIPY, L) comprising imidazo[1,2-a]pyridine and boron-dipyrromethene subunits, has been synthesized starting from imidazo[1,2-a]pyridine derivative and fully characterized. As evidenced by X-ray structural data, with metal cations binding to the vacant bidentate ligand
A simple and efficient route to 2‐arylimidazo[1,2‐a]pyridines and zolimidine using automated grindstone chemistry
作者:Dharmendra Das、Zigmee T. Bhutia、Padmini C. Panjikar、Amrita Chatterjee、Mainak Banerjee
DOI:10.1002/jhet.4106
日期:2020.11
A green and efficient mechanochemical method for the synthesis of a series of 2‐arylimidazo[1,2‐a]pyridines was developed using an electrical grinder. I2 catalyzed mechanochemical grinding facilitates the cyclocondensation reaction between various aryl methyl ketones and 2‐aminopyridines to afford 2‐arylimidazo[1,2‐a]pyridines in good yields at ambienttemperature. The method was successfully used
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。