Peptide Synthesis Coupling at Elevated Temperatures
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Solution Overview
Problem
Current peptide synthesis methods using carbodiimide and onium salt activation face limitations such as slow activation rates, high levels of deletions, and undesirable side reactions, particularly at elevated temperatures, which affect the purity and efficiency of peptide synthesis.
Innovation Solution
A modified carbodiimide activation strategy that incorporates a strong base in an amount less than one equivalent compared to the amino acid, used during the activation and coupling process at temperatures greater than 30°C, to enhance coupling efficiency and minimize side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbodiimide activation is performed at elevated temperatures to increase coupling speed, then productivity improves, but side reactions such as epimerization and premature cleavage increase
Solution Approach 1:
The patent changes the temperature parameter from room temperature to elevated temperatures (30-90°C) to accelerate the coupling reaction. This resolves the contradiction by optimizing the temperature range to achieve fast coupling while minimizing side reactions through controlled thermal conditions.
Solution Approach 2:
The patent introduces an additive (such as HOBt, HOAt, or Oxyma) as an intermediary substance that mediates the carbodiimide activation process. These additives form stable active esters that reduce epimerization and premature cleavage while maintaining fast coupling speeds at elevated temperatures.
2Manufacturing precision
If traditional carbodiimide activation is used at room temperature to minimize side reactions, then manufacturing precision improves, but activation rate becomes slow
Solution Approach 1:
The patent fundamentally changes the temperature parameter from room temperature to elevated temperatures (30-90°C), which accelerates the activation rate while maintaining high purity through controlled thermal conditions and the use of stabilizing additives.
Solution Approach 2:
The patent employs additives (HOBt, HOAt, Oxyma) as intermediaries that form stable active esters, enabling fast activation at elevated temperatures while preventing side reactions that would compromise purity.
3Productivity
If onium salt activation is used to achieve fast coupling at elevated temperatures, then productivity improves, but base-catalyzed side reactions increase
Solution Approach 1:
The patent uses carbodiimide (DIC or DCC) as a short-lived activating agent that rapidly forms the active ester and then decomposes to water-soluble urea byproducts. This disposable approach enables fast coupling at elevated temperatures without the persistent base-catalyzed side reactions associated with onium salts.
Solution Approach 2:
The patent changes the temperature parameter to elevated ranges (30-90°C) to accelerate the carbodiimide activation process, achieving onium-salt-like speeds while avoiding base-catalyzed side reactions through the inherent properties of carbodiimide chemistry.
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 improves the speed and purity of peptide synthesis, reducing epimerization and premature cleavage, while maintaining the stability of activated amino acid species, thus overcoming the limitations of traditional methods.
Implementation Method 1
A carbodiimide contains two slightly basic nitrogen atoms which will react with the carboxylic acid of an amino acid derivative to form a highly reactive O-acylisourea compound
Implementation Method 2
The formed O-acylisourea can then immediately react with an amine to form a peptide bond
Implementation Method 3
Using a Base During Carbodiimide-Type Activation... a base which first deprotonates the carboxylic acid to generate a carboxylate anion which in turn reacts with the onium salt activator
Data Source
AI summary
An improved method for coupling amino acids into peptides or peptidomimetics is disclosed that includes the steps of combining an amino acid, a carbodiimide, an activator additive, and a base at less than 1 equivalent compared to the amino acid to be activated; and carrying out the activation and coupling at a temperature greater than 30° C.