A copper/iodine cocatalyzed decarboxylative cyclization of α-amino acids is described. Starting from the readily available amino acids and either 2-benzoylpyridines or 2-benzoylquinolines, 1,3-disubstituted imidazo[1,5-a]pyridines and 1,3-disubstituted imidazo[1,5-a]quinolines were prepared in excellent yields.
描述了铜/碘共催化的α-氨基酸的脱羧环化。从容易获得的氨基酸和2-苯甲酰基吡啶或2-苯甲酰基喹啉开始,以优异的条件制备了1,3-二取代的咪唑并[1,5- a ]吡啶和1,3-二取代的咪唑并[1,5- a ]喹啉产量。
Heterogeneous copper-catalyzed decarboxylative cyclization of 2-benzoylpyridines with α-amino acids leading to imidazo[1,5-a]pyridines
作者:Yang Liao、Chenyu Yan、Rongli Zhang、Mingzhong Cai
DOI:10.1016/j.jorganchem.2018.11.030
日期:2019.2
The heterogeneous decarboxylative cyclization reaction between 2-benzoylpyridines and α-aminoacids was achieved in toluene at 120 °C in the presence of 15 mol% of l-proline-functionalized MCM-41-supported copper(II) complex [l-Proline-MCM-41-Cu(OTf)2] and iodine with di-tert-butyl peroxide (DTBP) as oxidant, yielding a variety of 1,3-disubstituted imidazo[1,5-a]pyridines in good to excellent yields
2- benzoylpyridines和α-氨基酸之间的非均相脱羧环化反应在甲苯中于120℃下在15%(摩尔)的存在下实现的升-脯氨酸官能MCM-41支持的铜(II)配合物[升-Proline- MCM-41-Cu(OTf)2 ]和碘与二叔丁基过氧化物(DTBP)作氧化剂,可产生各种1,3-二取代的咪唑并[1,5- a ]吡啶,产率高至优异。新的负载型铜催化剂可以用市售的廉价试剂制备,并通过简单的过滤从反应混合物中回收,并以几乎一致的活性回收至八次。
Copper(<scp>i</scp>)-catalyzed tandem synthesis of 2-acylquinolines from 2-ethynylanilines and glyoxals
An efficient one-step synthesis of 2-acylquinolines using a copper-catalyzed tandem reaction of 2-ethynylanilines with glyoxals in the presence of piperidine has been developed. This new protocol successfully avoids multi-step operation and the use of highly toxic cyanides required in traditional methods, and provides a practical tool for synthetic and pharmaceutical chemists. Various 2-acylquinolines
A copper(II)-catalyzed tandem reaction between pyridine ketone and benzylamine was developed by using clean O2 as an oxidant. This transformation proceeded via an efficient condensation–amination–oxidative dehydrogenation process, affording 1,3-diarylated imidazo[1,5-a]pyridines in excellent yields.
通过使用纯净的O 2作为氧化剂,进行了吡啶酮和苄胺之间的铜(II)催化串联反应。该转化过程通过有效的缩合-胺化-氧化脱氢过程进行,从而以优异的收率得到了1,3-二芳基咪唑并[1,5- a ]吡啶。
Highly Versatile Preparation of Imidazo[1,5‐a]quinolines and Characterization of Their Photoluminescent Properties
作者:Niclas Kulhanek、Niklas Martin、Richard Göttlich
DOI:10.1002/ejoc.202301007
日期:2024.1.2
In this work we show a robust and versatile procedure for the synthesis of substituted imidazo[1,5-a]quinolines and examine the influence of this substituents on the photophysical properties of this system.
在这项工作中,我们展示了一种稳健且通用的合成取代咪唑并[1,5- a ]喹啉的方法,并研究了该取代基对该系统光物理性质的影响。