A Review on Functionalization of Benzo-5,6-Fused Bicyclic Heteroaromatic Compounds.

Over the decades, functionalized heteroaromatic compounds and their scaffolds have drawn the significant attention in synthetic organic chemistry as well as in interdisciplinary sciences due to their prevalence in natural products, hormones, vitamins, and their applications in pharmaceuticals, agrochemicals, veterinary products, dyes and pigments, bio-imaging, semiconductors, and optoelectronics, etc. This review explores various synthetic strategies for functionalization of numerous 5,6 benzo-fused heteroaromatic derivatives such as indole, aza-indole, benzofuran, benzothiophene, benzimidazole, benzoxazole, benzothiazole and benzotriazole through various methods including C-H activation, cross-coupling, metal catalysis, photo-catalysis, electrocatalysis and organocatalysis in recent years (2019-2023). Highly functionalized heterocyclic scaffolds are the important precursors for synthesizing many bioactive drugs like fenbendazole, viozan, Griseofulvin, zileuton, flunoxaprofen, natural products, and optoelectronic materials, etc.

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