The chain extension with an α-ketoester unit at C-6 of 1,2:3,4-di-O-isopropylidene-α-D-galacto-hexodialdo-1,5-pyranose 1 followed by a catalytic reductive amination of the α-keto group led to the novel protected 2-(1′,2′:3′,4′-di-O-isopropylidene-6′-deoxy-α-D-galactopyranosyl) glycine diastereomers 6 and 6′ which are easy to separate. Chemoselective removal of N- or C-protecting groups at the α-aminoacid moiety allowed subsequent insertion of these 6-deoxy-α-D-galactopyranosyl glycine residues into a peptide chain.