Abstract
[reaction: see text] Fmoc amino acid symmetrical anhydrides are efficient and readily available reagents for acylation of the N-terminus of highly hindered C(alpha)(alpha)-dialkylated alpha-amino acids. Comparison of a variety of coupling protocols showed that the symmetrical anhydride method always provided the superior results. This method was successfully applied to the solid-phase synthesis of a peptide containing three alpha(alpha)AAs at alternating positions.
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