Dialdehyde Amine Conjugation Without Catalysts
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Solution Overview
Problem
Existing methods for molecule conjugation, such as Huigsen [3+2] "click" chemistry and activated carboxylic acid conjugation, require metal catalysts and produce side products that need removal, while other methods require reducing agents and complex conditions.
Innovation Solution
A method involving the reaction of non-polymeric aliphatic or aromatic dialdehydes with amine-containing compounds under aqueous and/or physiological conditions without catalysts or reducing agents, resulting in stable, irreversible products with no side products that need removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Huigsen [3+2] click chemistry is used for molecule conjugation, then conjugation efficiency is improved, but metal catalysts must be used which complicates the process
Solution Approach 1:
The patent removes the metal catalyst component from the conjugation process by using a dialdehyde-amine reaction system that proceeds without Cu(I) or other metal catalysts, thereby maintaining conjugation efficiency while eliminating the complexity associated with metal catalyst handling and removal
Solution Approach 2:
The patent introduces a dialdehyde compound as an intermediary reagent that reacts with amine-containing molecules to form conjugated products. This intermediary approach replaces the need for metal catalysts while maintaining reaction efficiency through a different chemical mechanism
2Ease of manufacture
If activated carboxylic acid conjugation is used, then conjugation can be performed, but side products are formed that must be removed
Solution Approach 1:
The patent eliminates the formation of problematic side products by using a dialdehyde-amine reaction system that produces water as the only byproduct, removing the need to remove N-hydroxysuccinimide or other activating group side products
Solution Approach 2:
The patent changes the chemical reaction parameters by using dialdehyde compounds instead of activated carboxylic acids, which fundamentally alters the reaction pathway to produce minimal side products that do not require removal
3Stability of the object's composition
If reducing agents are used in conjugation reactions, then cyclic structures can be formed, but reaction conditions become complex
Solution Approach 1:
The patent removes reducing agents from the reaction system by using dialdehyde compounds that form stable conjugated products with amines without requiring NaBH3(CN) or other reducing agents, thereby simplifying reaction conditions while maintaining product stability
Solution Approach 2:
The dialdehyde compound performs multiple functions: it acts as both the conjugating agent and the source of the cyclic structure formation, eliminating the need for separate reducing agent steps and simplifying the overall process
4Productivity
If polymeric dialdehyde compounds are used for conjugation, then reaction can proceed, but product isolation becomes difficult
Solution Approach 1:
The patent segments the dialdehyde compound into small molecular weight units (e.g., C1-C10 aliphatic or aromatic dialdehydes) rather than using polymeric structures, which maintains reaction efficiency while greatly facilitating product isolation and purification through standard techniques
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 method provides a versatile, efficient, and straightforward approach to molecule conjugation, suitable for various molecular classes, including dyes, fluorophores, and biomolecules, with high yields and minimal purification requirements.
Implementation Method 1
reacting a non-polymeric aliphatic dialdehyde or non-polymeric aromatic dialdehyde with a compound comprising an NH2 moiety under conditions for the conjugation of the NH2 moiety with the dialdehyde to form a conjugated product
Data Source
AI summary
Methods of conjugating two molecules are disclosed herein in which a non-polymeric aliphatic dialdehyde or non-polymeric aromatic dialdehyde is reacted with a compound comprising an amine (NH2) moiety to form a stable product under mild conditions.