Convenient syntheses of 1,2-trans selenoglycosides using isoselenuronium salts as glycosylselenenyl transfer reagents

► Glycosyl-isoselenuronium salts are convenient odorless reagents for the syntheses of selenoglycosides. ► Reactions proceeding under mild conditions with good yields. ► Glycosyl selenocarboxylates can similarly be obtained. ► The reaction is useful for the syntheses of selenodisaccharides as well.