Synthesis of Glucosyl Amino Acid Derivatives for Obtaining N‐Glucopeptides via SPPS: Optimization of the Synthetic Route**

Building blocks of Fmoc‐Asn‐β‐(2,3,4,6‐tetra‐O‐Acetyl‐D‐glucopyranosyl)‐OH ( 5 ) Fmoc‐Asn‐β‐(2,3,4,6‐tetra‐O‐Acetyl‐D‐mannopyranosyl)‐OH ( 5 a ), and Fmoc‐Asn‐β‐(2,3,4,6‐tetra‐O‐Acetyl‐D‐galactopyranosyl)‐OH ( 5 b ) were synthesized from D‐glucose, D‐mannose, and D‐galactose, respectively. The final products and their intermediates were characterized by means of NMR experiments. The synthetic route was optimized, and scaling to obtain 5 g of the...