Acid-Labile Cys-Protecting Groups for the Fmoc/tBu Strategy: Filling the Gap
摘要:
To address the existing gap in the current set of acid-labile Cys-protecting groups for the Fmoc/fBu strategy, diverse Fmoc-Cys(PG)-OH derivatives were prepared and incorporated into a model tripeptide to study their stability against TFA. S-Dpm proved to be compatible with the commonly used S-Trt group and was applied for the regioselecive construction of disulfide bonds.
Tetrahydropyranyl (Thp), which exploits the concept of being an S,O-acetal nonaromatic protectinggroup for cysteine, has been shown to be superior to Trt, Dpm, Acm, and StBu in solid-phase peptide synthesis using the Fmoc/tBu strategy. Thus, Cys racemization and C-terminal 3-(1-piperidinyl)alanine formation were minimized when the Cys was protected with Thp. This nonaromatic protectinggroup also
四氢吡喃基(THP),其利用的是一个概念小号,ö -acetal非芳香族保护基为半胱氨酸,已被证明优于TRT,DPM,ACM,和S吨在使用Fmoc固相肽合成BU / t Bu策略。因此,当Cys被Thp保护时,Cys外消旋作用和C末端3-(1-哌啶基)丙氨酸的形成被最小化。该非芳族保护基团还改善了含Cys的被保护肽的溶解性。
Evaluation of acid‐labile
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‐protecting groups to prevent Cys racemization in Fmoc solid‐phase peptide synthesis
作者:Hajime Hibino、Yasuyoshi Miki、Yuji Nishiuchi
DOI:10.1002/psc.2585
日期:2014.1
also the former method cannot reduce racemization of Cys(Trt) to an acceptable level (<1.0%) even when the preactivation procedure is omitted. Here, the 4,4′‐dimethoxydiphenylmethyl and 4‐methoxybenzyloxymethyl groups were demonstrated to be acid‐labileS‐protectinggroups that can suppress racemization of Cys to an acceptable level (<1.0%) when the respective Fmoc derivatives are incorporated via the
Solid-Phase Synthesis of C-Terminus Cysteine Peptide Acids
作者:Sinenhlanhla N. Mthembu、Amit Chakraborty、Ralph Schönleber、Fernando Albericio、Beatriz G. de la Torre
DOI:10.1021/acs.oprd.2c00321
日期:2022.12.16
Cysteine (Cys) is a key amino acid in many therapeutic peptides. For research and industrial purposes, solid-phase peptide synthesis is the method of choice for the preparation of most peptides. The solid-phase synthesis of C-terminal Cys peptideacids is problematic because it is accompanied by a side reaction, namely, the abstraction of α-H from the Cys residue, which leads to the formation of three