C(sp3)-H Bond Functionalization of 8-Methylquinolines

Abstract

Quinolines have emerged as essential components in various medicinal agents, playing a key role in treating various ailments. Numerous drugs with a quinoline core have been recognized for their antimalarial, antibacterial, and anticancer activities and have been successfully commercialized, including chloroquine, ciprofloxacin, topotecan, etc. Over the past two decades, a tremendous expansion in the C-H bond functionalization of quinoline scaffolds to widen this chemical space for drug discovery have been witnessed. This review article summarizes the efforts toward C(sp³)-H functionalization of 8-methylquinolines for C(sp³)-C/X bond formation under metal and metal-free strategies. Each section briefly overviews the C(sp³)-H functionalization of 8-methylquinoline, highlighting the metal and metal-free approaches.

Keywords: 8-methylquinolines; C(sp3)−H functionalization; meta-free C−H functionalization; transition metal-catalysis.