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Heterocyclic compounds have gained a great deal of attention as majority of the drugs contain heterocycle scaffolds. So the developments of new synthetic strategies for heterocycles are prime targets of the organic chemists over the years. Imidazopyridine is one of the important fused bicyclic 5–6 heterocycles and it is recognized as “drug prejudice” scaffold due to its wide applications in medicinal chemistry. This scaffold is the constituent of various marketed drug like zolpidem, alpidem, zolimidine, necopidem, saripidem etc. Recently, visible-light photocatalysis has become an impressive tool in organic synthesis. In this realm, the merger of transition metal catalysis and visible light photoredox catalysis offers an exciting opportunity to perform the organic transformations in mild conditions. In this lecture I will discuss our recent works on sustainable synthesis of imidazo[1,2-a]pyridines,1,2 and indazoles.3
References and Notes:
1. (a) Bagdi, A. K.; Santra, S.; Monir, K; Hajra, A. Chem. Commun. 2015, 51, 1555.
2. (a) Mitra, S.; Hajra, A. Org. Lett. 2014, 16, 5652; (b) Mishra, S.; Monir, K.; Mitra, S.; Hajra, A. Org. Lett. 2014, 16, 6084; (c) Mondal, S.; Hajra, A. Org. Lett. 2017, 19, 3751; (d) Samanta, S.; Mondal, S.; Ghosh, D.; Hajra, A. Org. Lett. 2019, 21, 4905.; (e) Singsardar, M.; Mondal, S.; Laru, S. Hajra, A. Org. Lett. 2019, 21, 5606.
3. (a) Ghosh, P.; Mondal, S.; Hajra, A. Org. Lett. 2020, 22, 1086; (b) Neogi, S.; Ghosh, A. K.; Majhi, K.; Samant, S.; Kibriya, G.; Hajra, A. Org. Lett. 2020, 22, 5605; (c) Bhattacharjee, S.; Laru, S.; Hajra, A. Chem. Commun. 2022, 58, 981.
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