Reductive nickel catalysis was leveraged to orchestrate the multicomponent union of glycosyl halides, organoiodides and isobutyl chloroformate to assemble C-acyl glycosides in high anomeric selectivities. Computational studies provided insights that rationalize the origin of the high chemoselectivity. The method is applicable to the synthesis of complex C-linked disaccharides and late-stage keto-glycosylation