Peptide Synthesis Additives Suppress Epimerization
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Solution Overview
Problem
Current peptide synthesis methods face challenges in reducing unwanted side reactions such as epimerization and double insertion, particularly with amino acids like histidine, which affect the purity and efficiency of peptide production.
Innovation Solution
A method involving the use of a carbodiimide coupling agent, specific additives like ethyl 2-cyano-2-(hydroxyimino)acetate, and controlled solvent conditions to form an amide bond between amino acid components, minimizing epimerization and double insertion during peptide synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard coupling reagents are used for peptide synthesis, then the coupling reaction proceeds efficiently, but unwanted side reactions such as epimerization and double insertion occur
Solution Approach 1:
The patent modifies the chemical structure of coupling reagents by introducing specific substituents (e.g., cyano group, hydroxyimino group) to change their reactivity parameters. This allows the coupling reaction to proceed efficiently while suppressing side reactions like epimerization and double insertion, thus resolving the contradiction between productivity and manufacturing precision
Solution Approach 2:
The patent uses intermediate compounds (activated esters) formed during the coupling reaction as mediators. These intermediates are designed to be highly reactive toward the desired coupling but less prone to cause epimerization, thereby maintaining high coupling efficiency while improving peptide purity
2Manufacturing precision
If coupling conditions are optimized to reduce epimerization, then peptide purity improves, but coupling efficiency decreases
Solution Approach 1:
The patent changes the chemical parameters of coupling reagents by introducing electron-withdrawing groups (cyano, hydroxyimino) that modify the reaction mechanism. This allows achieving both high peptide purity and maintained coupling efficiency simultaneously, resolving the inverse relationship between these two parameters
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the formation of unwanted side products, enhancing the purity and efficiency of peptide synthesis, especially for challenging amino acids like histidine, leading to higher yields of target peptides.
Implementation Method 1
The condensation of the first component C-1 and the second component C-2 is carried out in the presence of a carbodiimide coupling agent
Implementation Method 2
a first additive A-1 of formula A-I: wherein in formula A-I, R1 at each occurrence is independently selected from the group consisting of hydrogen, C1-C6-alkyl, F, Cl, Br, -CF3, -CN, -C(=O)OREWG
Data Source
AI summary
The invention pertains to a method for the synthesis of a peptide by condensing a first component and a second component, both independently selected from the group consisting of an amino acid and a peptide in the presence of a carbodiimide coupling agent, a first additive, and a second additive. The first additive is an optionally substituted 2-hydroxypyridine N-oxide. The second additive has a defined chemical structure and is used in a total molar amount of at least 1.0 to 5.0 equivalents relative to the first component. Further aspects of the invention relate to compositions comprising the aforementioned compounds.