Polarity-Matched Initiation of Radical-Polar Crossover Reactions for the Synthesis of C -Allyl Glycosides with gem -Difluoroalkene Groups.

Herein, we disclose a general method for the assembly of C -allyl glycosides containing gem -difluoroalkene groups via a radical-polar crossover strategy. Central to the success of this process is the polarity matching between the benzenesulfinate radical and the glycosyl donor, which facilitates the initiation of the glycosyl radical and the subsequent formation of gem -difluoroalkene sugar derivatives. This method demonstrated good compatibility with various glycosyl donors and functional groups. Furthermore, we showcase the utility of this method in modifying amino acids, potentially paving the way for analogous modifications to peptides.