A facile Er(OTf)3-catalyzed synthesis of 2,3-unsaturated O- and S-glycosides

Er(OTf)3 is a useful catalyst for the Ferrier rearrangement furnishing high yields of O- and S-glycosides. The transformation has wide applicability, cleaner reaction profiles, mild reaction conditions, and high stereoselectivity and the catalyst, which is also commercially available, can be recovered and reused.

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