一系列取代的2-芳基咪唑并[1,2-α]吡啶已被制备,其中多种取代基被引入在苯环的4'位和在3,5的,6或7位杂环。大多数实例在4'-位具有乙酰氨基,溴,氰基或甲酰基取代基。还已经制备了类似的咪唑并[ 2,1- b ]噻唑和咪唑并[1,2- a ]嘧啶。制备了由咪唑的4'-甲酰基苯氧基甲基衍生物,吡啶,噻唑,苯并咪唑和环取代的咪唑并[1,2- a ]吡啶的三个位置异构体组成的另一系列化合物。还制备了咪唑和咪唑并[1,2- a ]吡啶的2-(4'-甲酰基苯基乙烯基)衍生物。
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
Rhodium(III)‐Catalyzed Annulation of 2‐Arylimidazo[1,2‐
<i>a</i>
]pyridines with Maleimides: Synthesis of 1
<i>H</i>
‐Benzo[
<i>e</i>
]pyrido[1′,2′:1,2]imidazo[4,5‐
<i>g</i>
]isoindole‐1,3(2
<i>H</i>
)‐Diones and their Photophysical Studies
作者:Vikki N. Shinde、Tapta Kanchan Roy、Sonam Jaspal、Dhananjay S. Nipate、Neha Meena、Krishnan Rangan、Dalip Kumar、Anil Kumar
DOI:10.1002/adsc.202000960
日期:2020.12.22
2‐aryl‐imidazo[1,2‐a]pyridines with maleimides is described. The reaction afforded 1H‐benzo[e]pyrido[1′,2′:1,2]imidazo[4,5‐g]isoindole‐1,3(2H)‐diones in high yields with wide range of functional group tolerance. The reaction proceeds through Rh(III)‐catalyzed C−H bond activation, followed by maleimide insertion and intramolecular cyclization. Photophysical properties of 1H‐benzo[e]pyrido[1′,2′:1,2]imidazo[4
描述了铑(III)催化的2-芳基咪唑并[1,2- a ]吡啶与马来酰亚胺的脱氢环化反应。反应以高收率提供了1 H-苯并[ e ]吡啶基[1',2':1,2]咪唑并[4,5 - g ]异吲哚-1,3(2H)-二酮,具有宽泛的官能团耐受性。反应通过Rh(III)催化的CH键活化,然后进行马来酰亚胺插入和分子内环化。1 H-苯并[ e ]吡啶并[1',2':1,2]咪唑[4,5- g ]的光物理性质用紫外可见光谱和荧光光谱研究了] isoindole-1,3(2H)-二酮,并通过量子化学计算进行了验证。所有的环状产物均显示出较大的斯托克斯位移值,且发射范围为530–618 nm,并且具有中等至高的量子产率。
Facile synthesis of imidazo[1,2-a]pyridines promoted by room-temperature ionic liquids under ultrasound irradiation
作者:Piyawat Paengphua、Sirirat Chancharunee
DOI:10.1007/s00706-018-2238-3
日期:2018.10
AbstractA simple and efficient procedure for the synthesis of substituted imidazo[1,2-a]pyridines underultrasoundirradiation has been developed. The reactions were carried out using ionic liquids as catalyst. The reaction procedure demonstrated a broad substrate scope for both acetophenones and 2-aminopyridines, and provided convenient access to a wide variety of imidazo[1,2-a]pyridines. The present
摘要开发了一种简单有效的方法,在超声辐射下合成取代的咪唑并[1,2- a ]吡啶。使用离子液体作为催化剂进行反应。该反应过程证明了乙酰苯和2-氨基吡啶的底物范围广,并提供了对各种咪唑并[1,2- a ]吡啶的便捷通道。与传统的加热方法相比,本方法具有许多优点,例如产率更高,反应时间更短,反应条件更温和以及后处理步骤更容易。 图形概要
Copper catalyzed tandem oxidative C–H amination/cyclizations: Direct access to imidazo[1,2-a]pyridines
and convenient strategy is described for the synthesis of imidazo[1,2-a]pyridines via inexpensive copper-catalyzed tandem imine formation and intramolecular aerobic oxidative C–H bond amination/cyclizations. An array of imidazo[1,2-a]pyridines were prepared by the reaction of readily available acetophenones and 2-aminopyridines in good to excellent yields (48–92%). The scope of the method was validated
Novel one step synthesis of imidazo[1,2-a]pyridines and Zolimidine via iron/iodine-catalyzed Ortoleva-King type protocol
作者:Sankuviruthiyil Mohanan Ujwaldev、K.R. Rohit、Nissy Ann Harry、Gopinathan Anilkumar
DOI:10.1016/j.tetlet.2019.150950
日期:2019.8
Imidazo[1,2-a]pyridines form versatile scaffolds in pharmaceutical industry arising from their diverse biological activities. The synthesis of these molecules thus has been of great interest and resulted in the development of a large number of new methodologies. Herein we describe the first iron-catalyzed Ortoleva-King type protocol towards the synthesis of these fused heterocycliccompounds. This
咪唑并[1,2- a ]吡啶因其多种生物活性而在制药工业中形成多功能支架。因此,这些分子的合成引起了极大的兴趣,并导致了许多新方法的发展。在这里,我们描述了第一个铁催化的Ortoleva-King型协议,以合成这些稠合的杂环化合物。该方法采用廉价且容易获得的FeCl 3 ·6H 2 O和分子碘作为催化体系。该过程已被基板范围与各种芳族酮和2-氨基吡啶,得到不同的咪唑并延伸[1,2被很好探索一个吡啶衍生物的产率中等至良好。该方案的成功应用还通过直接一步合成胃保护药物Zolimidine得到了证明。