The reaction between alpha-glycosyl bromides and potassium p-methylselenobenzoate yields beta-p-methylbenzoyl selenoglycosides. The acyl selenoglycosides were activated by the action of a secondary amine and CS2CO3 to produce an anomeric selenolate anion, which reacted in situ with various electrophiles to yield novel selenoglycosides while retaining the anomeric stereochemistry.