A Cassette Ligation Strategy with Thioether Replacement of Three Gly-Gly Peptide Bonds: Total Chemical Synthesis of the 101 Residue Protein Early Pregnancy Factor [ψ(CH<sub>2</sub>S)<sup>28</sup><sup>-</sup><sup>29,56</sup><sup>-</sup><sup>57,76</sup><sup>-</sup><sup>77</sup>]
作者:Darren R. Englebretsen、Bronwyn Garnham、Paul F. Alewood
DOI:10.1021/jo016121e
日期:2002.8.1
with a ClCH(2)CO-peptide, where thiolate displacement of the halide leads to chemoselective formation of a thioether surrogate for the Gly-Gly peptide bond. This rate difference was used as the basis of a novel sequential ligation approach to the synthesis of large polypeptide chains. Thus, ligation of a model bifunctional N(alpha)-chloroacetyl, C-terminal thiolated peptide with a second N(alpha)-bromoacetyl