Skeletal Diverse Synthesis of N-Fused Polycyclic Heterocycles via the Sequence of Ugi-Type MCR and CuI-Catalyzed Coupling/Tandem Pictet–Spengler Reaction
摘要:
Several diversity-oriented syntheses of N-fused polycyclic heterocycles have been demonstrated but most of them are based on point diversity within the same library and usually involve time-consuming sequential multistep syntheses, which also suffer from low yields and/or poor precursor scopes. We have developed a new strategy for the syntheses of skeletal diverse N-fused polycyclic compounds via an Ugi-type MCR followed by a CuI-catalyzed coupling reaction or tandem Pictet-Spengler reaction. This two-step sequence provides eight distinct skeleton of fused {6-5-5-6}, {5-5-5-6}, {6-5-6-6}, and {5-5-6-6} ring systems that have applications in medicinal chemistry and chemical genetics too.
Efficient Synthesis of 3-Aminoimidazo[1,2-a] Pyridines Using Silica-Supported Perchloric Acid (HClO4-SiO2) as a Novel Heterogenous Catalyst
作者:Azizollah Habibi、Zahra Tarameshloo、Shahnaz Rostamizadeh、Ali M. Amani
DOI:10.2174/157017812800167439
日期:2012.3.1
An efficient and green protocol for synthesis of 3-aminoimidazo[1,2-a] pyridine derivatives through a three-component reaction of aldehyde, 2-amino pyridine and isocyanide in the presence of silica-supportedperchloricacid (HClO4-SiO2) is described in this paper. The solid catalyst could be recycled and reused.
In this study, first biocatalytic synthesis of clinically important imidazo[1,2- a]pyridine based compounds has been achieved. The Candida antarctica lipase B (CALB) enzyme was found suitable to catalyze the Groebke-Blackburn-Bienaymé (GBB) multicomponent reaction of substituted 2-aminopyridine, benzaldehyde and isocyanides to synthesize imidazo[1,2-a]pyridine derivatives in very good yields. Further
Multicomponent synthesis of imidazo[1,2-a]pyridines using catalytic zinc chloride
作者:Amanda L. Rousseau、Pulane Matlaba、Christopher J. Parkinson
DOI:10.1016/j.tetlet.2007.04.008
日期:2007.6
The novel use of zincchloride to catalyze the one-pot, three component synthesis of imidazo[1,2-a]pyridines from a range of substrates using either conventional heating or microwave irradiation is described. This methodology affords a number of imidazo[1,2-a]pyridines in reasonable yields and short reaction times without any significant optimization of the reaction conditions.
描述了使用常规加热或微波辐照从一系列底物上催化氯化锌催化一锅,三组分合成咪唑并[1,2- a ]吡啶的新方法。该方法以合理的产率和短的反应时间提供了许多咪唑并[1,2- a ]吡啶,而没有对反应条件进行任何显着的优化。
synthesis of quaternary α-aminosuccinimides in toluene medium involving 2-phenylimidazo[1, 2-a]pyridine in a one-pot reaction promoted by FerricNitrate at 120 °C. The protocol presented herein, is for the first time, via a novel transformation where FerricNitrate promotes imidazo[1,2-a]pyridine structural metamorphosis to the title compound quaternary succinimides. High compatibility, easy work-up