Photoinduced Ruthenium-Catalyzed -C-H Glycosylation.

C-H functionalization has surfaced as a powerful tool in molecular synthesis. -Selective arene C-H activations typically rely on rather costly palladium or rhodium catalysts, elaborate template auxiliaries, or elevated temperatures, and -glycosylations are scarce. In contrast, we herein report on a visible-light-induced ruthenium-catalyzed -C-H glycosylation that utilizes a stable ruthenium-(II) catalyst under exceedingly mild conditions at room temperature. This strategy is operative without an exogenous photocatalyst. The versatile ruthenium-(II) catalyst featured high - and anomeric α-selectivity, employing readily accessible glycosyl bromides.