Rapid and efficient synthesis of peptide fragments containing α- aminoisobutyric acid using Fmoc-amino acid chlorides/potassium salt of 1- hydroxybenzotriazole

摘要

The synthesis of peptides containing multiple Aib residues was accomplished using Fmoc-Aib-Cl in presence of KOBt. As no additional base was added, the duration of coupling reactions could be extended. Thus, the synthesis of the alamethicin 1-4 fragment, Aib-Pro-Aib-Ala, the emerimicin 2- 6 fragment, Aib-Aib-Aib-Val-Gly and the Aib tetramer, Fmoc-(Aib)4-OBzl were accomplished in good yield and purity.