Efficient and reproducible synthesis of an Fmoc-protected Tn antigen

This concise total synthesis of the Thomsen-Nouveau (Tn) glycoconjugate was accomplished using a palladium-catalyzed coupling between the glycosyl donor and Fmoc-protected serine acceptor. This is, to the best of our knowledge, the shortest synthesis reported from galactose for preparing this essential building block for large-scale solid phase peptide synthesis.