Fmoc-aza-β3-Lys-OAllyl and Fmoc-aza-β3-Asp-OAllyl for on-resin head-to-tail cyclization of aza-β3-peptides
2013
A rapid and efficient Fmoc/t-Bu solid-phase peptide synthesis (SPPS) of cyclic aza-beta(3)-peptide analogs by allyl strategy is described. Our synthetic approach includes the synthesis of two new aza-beta(3)-amino acids, Fmoc-aza-beta(3)-Lys-OAllyl and Fmoc-aza-beta(3)-Asp-OAllyl, then the resin attachment of the first aza-beta(3)-amino acid via its side chain, successful use of combination of three orthogonal removable protecting groups, stepwise solid-phase synthesis of linear peptide analog, and on-resin head-to-tail cyclization. (C) 2012 Elsevier Ltd. All rights reserved.
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