Advancements in chemical methodologies for the synthesis of 3-aroylimidazo[1,2-a]pyridines: an update of the decade

FeBr3-catalysed synthesis of 3-aroylimidazo[1,2-a]pyridine and 3,3'-(arylmethylene)bis(2-phenylimidazo[1,2-a]pyridines) derivatives from 2-arylimidazo[1,2-a]pyridines and aromatic aldehydes: an investigation about mechanistic insights

In a new approach, a series of 3-aroylimidazo[1,2-a]pyridine derivatives were prepared in high yields. This approach revealed the direct Fe-catalyzed functionalization of imidazo[1,2-a]pyridine derivatives with aryl aldehydes via an aerobic oxidative cross-dehydrogenative coupling process. This transformation occurred in the presence of air, and FeBr3 served as a homogeneous Lewis catalyst. O2 was found to be the principal oxidant responsible for the method's success. Interestingly, when these reactions were carried out under an argon atmosphere, 3,3'-(arylmethylene)bis(2-phenylimidazo[1,2-a]pyridines) derivatives were prepared in good yields.

Imidazo[1,2-A]Pyridine: Potent Biological Activity, SAR and Docking Investigations (2017-2022)

BACKGROUND

Regarding scientific research, Imidazo[1,2-a] pyridine derivatives are constantly being developed due to the scaffold's intriguing chemical structure and varied biological activity. They are distinctive organic nitrogen-bridged heterocyclic compounds that have several uses in medicines, organometallics and natural products. It has become a vital tool for medicinal chemists.

METHODS

In order to gather scientific information on Imidazo[1,2-a] pyridines derivative, Google, PubMed, Scopus, Google Scholar, and other databases were searched. In the current study, the medicinal value and therapeutic effect of Imidazo[1,2-a] pyridines were investigated using above mentioned databases. The current study analyzed the detailed pharmacological activities of Imidazo[1,2-a] pyridine analogs through literature from diverse scientific research works.

RESULTS

Due to its wide range of biological activities, including antiulcer, anticonvulsant, antiprotozoal, anthelmintic, antiepileptic, antifungal, antibacterial, analgesic, antiviral, anticancer, anti-inflammatory, antituberculosis, and antitumor properties, imidazopyridine is one of the most significant structural skeletons in the field of natural and pharmaceutical products. An imidazopyridine scaffold serves as the basis for a number of therapeutically utilized medications, including zolpidem, alpidem, olprinone, zolimidine, and necopidem.

CONCLUSION

This comprehensive study covers the period of the last five years, and it sheds light on the developments and emerging pharmacological actions of Imidazo[1,2-a] pyridines. Additionally, the structure-activity relationship and molecular docking studies are carefully documented throughout the paper, providing medicinal chemists with a clear picture for developing new drugs.

Ag2O/squaramide cocatalyzed asymmetric interrupted Barton-Zard reaction of 8-nitroimidazo[1,2-a]pyridines

Imidazo[1,2-a]pyridines are present in numerous biologically active compounds as the core structural motif. Herein, we report an asymmetric interrupted Barton-Zard reaction of electron-deficient imidazo[1,2-a]pyridines with α-substituted isocyanoacetates. The reaction enables the dearomatization of 8-nitroimidazo[1,2-a]pyridines and hence offers straightforward access to an array of optically active highly functionalized imidazo[1,2-a]pyridine derivatives that possess three contiguous stereogenic centers in good yields (up to 98%) with high stereoselectivities (>19:1 dr, >99% ee). It is worth noting that the catalytic system consisting of a chiral squaramide and silver oxide displays remarkable reactivity and stereoselectivity, and a gram-scale reaction is compatible with the catalyst loading of 0.5 mol%. In addition, the synthetic potential of this method was showcased by versatile transformations of the product.

Recent Progress in Metal-Free Direct Synthesis of Imidazo[1,2-a]pyridines

This Mini-Review highlights the most effective protocols for metal-free direct synthesis of imidazo[1,2-a]pyridines, crucial target products and key intermediates, developed in the past decade. The emphases is given on the ecological impact of the methods and on the mechanistic aspects as well. The procedures efficiently applied in the preparation of important drugs and promising drug candidates are also underlined.