Sustainable and efficient manufacturing methods for N-methylated peptides remain underexplored despite growing interest in therapeutic N-methylated peptides within the pharmaceutical industry. A methodology for the coupling of C-terminally unprotected N-methylamino acids mediated by an isostearic acid halide (ISTAX) and silylating reagent has been developed. This approach allows for the coupling of
Design, synthesis and evaluation of β-lactam antigenic peptide hybrids; unusual opening of the β-lactam ring in acidic media
作者:Marion Tarbe、Itxaso Azcune、Eva Balentová、John J. Miles、Emily E. Edwards、Kim M. Miles、Priscilla Do、Brian M. Baker、Andrew K. Sewell、Jesus M. Aizpurua、Céline Douat-Casassus、Stéphane Quideau
DOI:10.1039/c003877f
日期:——
β-Lactam peptides were envisioned as conformational constraints in antigenic peptides (APs). Three different β-lactam tripeptides of varying flexibility were prepared in solution and incorporated in place of the central part of the altered melanoma associated antigenic peptide Leu27-Melan-A26â35 using solid phase synthesis techniques. Upon TFA cleavage from the solid support, an unexpected opening of the β-lactam ring occurred with conservation of the amide bond. After adaptation of the solid phase synthesis strategy, β-lactam peptides were successfully obtained and both opened and closed forms were evaluated for their capacity to bind to the antigen-presenting class-I MHC HLA-A2 protein system. None of the closed β-lactam peptides bound to HLA-A2, but their opened variants were shown to be moderate to good HLA-A2 ligands, one of them being even capable of stimulating a Melan-A-specific T cell line.
Paquet, Alenka; Chen, Francis M. F.; Benoiton, N. Leo, Canadian Journal of Chemistry, 1984, vol. 62, p. 1335 - 1338
作者:Paquet, Alenka、Chen, Francis M. F.、Benoiton, N. Leo
DOI:——
日期:——
Efficient Acylation of the <i>N</i>-Terminus of Highly Hindered <i>C</i><sup>α</sup><sup>,</sup><sup>α</sup>-Disubstituted Amino Acids via Amino Acid Symmetrical Anhydrides
作者:Yanwen Fu、Robert P. Hammer
DOI:10.1021/ol016965k
日期:2002.1.1
GRAPHICSFmoc amino acid symmetrical anhydrides are efficient and readily available reagents for acylation of the N-terminus of highly hindered C-alpha,C-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 alphaalphaAAs at alternating positions.
A liquid-phase peptide synthesis in cyclohexane-based biphasic thermomorphic systems
作者:Kazuhiro Chiba、Yusuke Kono、Shokaku Kim、Kohsuke Nishimoto、Yoshikazu Kitano、Masahiro Tada
DOI:10.1039/b205156g
日期:——
Combinations of typical organic solvents composed of cyclohexane and qualified aprotic polar organic solvents were found to realize an effecitive, biphasic thermomorphic system in arbitrary ratios of upper and lower phases that enable a practical application of a liquid-phase peptide synthesis.