Synthesis of 5-amino-2-aminoalkyl-1,3-oxazol-4-ylphosphonic acid derivatives and their use in the preparation of phosphorylated peptidomimetics

Starting from phthalimidoalkanoylamines 1 (amino-protected derivatives of glycine, β-alanine, γ-amino butyric, δ-amino valeric, and ε-amino caproic acids), a facile synthetic method has been developed to obtain diethyl 5-alkyl(dialkyl)amino-2-aminoalkyl-1,3-oxazol-4-ylphosphonates 7, which have been further used in the preparation of phosphorylated peptidomimetics 10 and 12.