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p-Methoxyphenol: A potent and effective scavenger for solid-phase peptide synthesis
Jhoan Samacá1,2, Erika Velandia-Bautista1,3, Luisa Tabares1,3
1Peptide Synthesis Department, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, DC, 111221, Colombia.
Summary
p-methoxyphenol effectively removes amino acid side chain protecting groups during solid-phase peptide synthesis (SPPS). This potent scavenger performs similarly to conventional methods in t-Boc/Bzl strategies, simplifying peptide cleavage.
Area of Science:
- Organic Chemistry
- Biochemistry
- Synthetic Chemistry
Background:
- Solid-phase peptide synthesis (SPPS) requires efficient removal of protecting groups.
- Hydrogen fluoride (HF) is commonly used for cleavage, necessitating effective scavengers.
- Carbocations generated during SN 1 reactions must be trapped by nucleophiles.
Purpose of the Study:
- To evaluate p-methoxyphenol as a potent scavenger in t-Boc/Bzl SPPS.
- To compare the efficacy of p-methoxyphenol against p-cresol, a conventional scavenger.
- To investigate the chemical properties of p-methoxyphenol relevant to its scavenger function.
Main Methods:
- Synthesis of five peptide sequences using t-Boc/Bzl SPPS.
- Cleavage of resin-bound peptides using p-methoxyphenol and p-cresol as scavengers.
- Analysis of scavenger efficacy using chromatography and mass spectrometry.
- Computational analysis of electrostatic potential maps (EPM) for nucleophile comparison.
Main Results:
- p-methoxyphenol demonstrated good scavenger efficacy, comparable to p-cresol.
- Chromatography and mass spectrometry confirmed successful peptide cleavage with p-methoxyphenol.
- EPM analysis revealed similarities in charge distribution and pKa values between p-methoxyphenol and p-cresol.
Conclusions:
- p-methoxyphenol is a potent and effective scavenger for the t-Boc/Bzl SPPS strategy.
- It can be utilized as a viable alternative to conventional scavengers like p-cresol.
- The chemical properties of p-methoxyphenol support its role in trapping carbocations during peptide cleavage.
