N-Substituted Cyclic Peptide Synthesis with Green Solvents
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Solution Overview
Problem
Existing methods for producing cyclic peptides containing unnatural amino acids face challenges such as low reactivity, racemization, side reactions, environmental concerns with solvents like DMF and dichloromethane, and inefficiencies in industrial-scale synthesis due to isolation and purification of intermediates, leading to prolonged synthesis times and increased costs.
Innovation Solution
A method utilizing solvents like 2-MeTHF, THF, and others that allow efficient peptide chain elongation and cyclization without intermediate isolation, enabling continuous reactions and purification by crystallization instead of column chromatography, while removing stabilizing agents through simple operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solvents like DMF and dichloromethane are used in peptide synthesis, then reaction efficiency is maintained, but environmental burden increases and safety concerns arise
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by replacing conventional solvents (DMF, dichloromethane) with green alternatives (2-MeTHF, ethyl acetate, ethanol, water). This substitution maintains reaction efficiency while eliminating environmental hazards associated with toxic solvents, directly resolving the contradiction between productivity and environmental safety.
Solution Approach 2:
The patent employs readily available, biodegradable solvents from renewable resources (such as 2-MeTHF from biomass) that can be easily disposed of or degraded environmentally. These solvents replace persistent, toxic conventional solvents, allowing efficient reactions without long-term environmental accumulation, thus balancing productivity with environmental responsibility.
2Manufacturing precision
If intermediates are isolated and purified at each step, then product purity is maintained, but synthesis time increases and productivity decreases
Solution Approach 1:
The patent implements continuous peptide synthesis without isolating intermediates. The reaction mixture proceeds directly from one condensation step to the next, maintaining continuous useful action. Purity is ensured through selective precipitation and filtration of the final cyclic peptide product, rather than intermediate purification, thus maintaining high purity while dramatically reducing synthesis time and increasing productivity.
Solution Approach 2:
The patent performs preliminary protection of amino acid functional groups before the synthesis sequence begins. This preliminary action allows subsequent reactions to proceed without additional purification steps, as the protecting groups prevent unwanted side reactions. The final product can be obtained in high purity through simple filtration, eliminating the need for time-consuming intermediate chromatography while maintaining manufacturing precision.
3Reliability
If N-substituted amino acids are used to improve metabolic stability, then druglikeness increases, but reactivity decreases due to steric hindrance
Solution Approach 1:
The patent changes the reaction parameters by using highly reactive coupling reagents (T3P, HATU, COMU) and optimizing solvent conditions (2-MeTHF, ethyl acetate) to compensate for the reduced reactivity of N-substituted amino acids. These parameter changes enable efficient condensation reactions despite steric hindrance, allowing the use of N-substituted amino acids for improved metabolic stability without sacrificing productivity.
Solution Approach 2:
The patent introduces powerful coupling reagents as intermediaries to facilitate the condensation reaction between carboxylic acids and N-substituted amino acids. These coupling reagents act as mediators that activate the carboxylic acid group, making it sufficiently reactive to overcome the steric hindrance of the N-substituted amino acid, thus enabling high-yield peptide bond formation while maintaining the desired metabolic stability.
4Productivity
If halogenated hydrocarbon solvents and amide solvents are used, then peptide synthesis proceeds efficiently, but side reactions increase and environmental impact worsens
Solution Approach 1:
The patent changes the solvent parameters by replacing halogenated hydrocarbons and amide solvents with green alternatives (2-MeTHF, ethyl acetate, ethanol, water). This substitution eliminates the formation of harmful side products associated with conventional solvents while maintaining synthesis efficiency through optimized reaction conditions and selective precipitation of the final product.
Solution Approach 2:
The patent converts the potential harm of using green solvents (which may have lower solubility for peptide intermediates) into a benefit by utilizing selective precipitation. The final cyclic peptide product precipitates selectively from the green solvent system, allowing easy purification by filtration. This transforms what could be a disadvantage into an advantage, eliminating side reactions while maintaining efficiency.
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 enhances yield and reduces synthesis time, minimizes side reactions, and avoids environmental hazards, making it suitable for industrial-scale production of cyclic peptides with high purity.
Implementation Method 1
dissolving the cyclic peptide compound in a first polar organic solvent to obtain a solution
Implementation Method 2
concentrating the solution to obtain a residue of the cyclic peptide compound
Implementation Method 3
adding a mixture of water and a second polar organic solvent to the residue to obtain a hydrate crystal of the cyclic peptide compound
Data Source
AI summary
The present invention provides methods for producing peptide compounds. The inventors have found that a cyclic peptide compound can be produced efficiently by linking the N-terminal amino acid residue and the C-terminal amino acid residue of a peptide compound in a solvent containing one or more selected from the group consisting of water-immiscible solvents, water-soluble alkyl nitriles, and water-soluble ethers.