A general route to phosphopeptids with a 2-oxoalkylphosphonate moiety at the terminal N- aminogroup or with a 1-aminoalkylphosphonate moiety at the terminal C-carboxyl group is described. The method allows the preparation of various phosphopeptids with an α- alkylated carbon atom on the PC bond from the very available dialkylphosphonoalcanoïc acids as starting products. Phosphopeptides with a2-oxoalkylphosphonate moiety as ...