gem -Difluoroalkylation of Cyclic Ethers Enabled by Cobalt-Catalyzed C(sp 3 )-H Oxidation under Mild Conditions.

Fluorinated rings have emerged as privileged structural modules in the fields of drug discovery and materials research. The incorporation of fluorine atoms into aromatic rings or heterocycles can lead to significant improvements in the physicochemical and biological properties of small molecules, making them valuable components in the design of new drugs and functional materials. Herein, we presented a cobalt-catalyzed C-H oxidation/ gem -difluorination cascade reaction of readily available cyclic ethers with difluoroenoxysilanes, affording a series of gem -difluorinated analogues with moderate to high yields. The obtained products as versatile fluoroalkyl building blocks were showcased through divergent-oriented transformations.