Deprotection of N-Alloc amines by Pd(0)/DABCO—an efficient method for in situ peptide coupling of labile amino acids

A highly efficient one-pot deprotection/peptide coupling protocol of N-Alloc amino acids with activated N-Boc or N-Fmoc amino acids was developed in solution and on solid phase. DABCO was found to be especially effective for the deprotection of the N-Alloc group, resulting in short reaction times (10–20 min) and allowing the coupling of amino acids that are unstable in unprotected forms.