Bioactive Conjugate Construction With Stoichiometric Thiol Reactants
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Solution Overview
Problem
Existing methods for intermolecular conjugation of modular motifs, such as bioconjugates, require large excesses of thiol groups, leading to inefficiency and high costs, and the 1-thio-isoindole products formed have low stability.
Innovation Solution
The use of an additive, such as guanidine, in an aqueous buffer to suppress unwanted reactions, allowing stoichiometric amounts of thiol and amine groups to form conjugates, and incorporating sterically hindered thiols to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large excesses of thiol groups are used for intermolecular conjugation, then the conjugation reaction can proceed, but the efficiency decreases and costs increase
Solution Approach 1:
The patent introduces an additive as an intermediary substance that mediates the conjugation reaction between thiol and amine groups. This additive enables the reaction to proceed with stoichiometric amounts of reagents rather than requiring large excesses, thereby improving conjugation efficiency while reducing waste of thiol groups.
Solution Approach 2:
The patent changes the reaction parameters by introducing an additive that modifies the reaction conditions. This parameter change allows the conjugation reaction to achieve high efficiency with stoichiometric amounts of thiol and amine groups, eliminating the need for large excesses and reducing both cost and waste.
2Reliability
If 1-thio-isoindole products are formed through conventional methods, then conjugation occurs, but the product stability is low
Solution Approach 1:
The additive serves as a mediator that facilitates the formation of more stable conjugation products. By introducing this intermediary substance, the reaction pathway is modified to produce conjugates with enhanced stability while maintaining high production efficiency, resolving the contradiction between reliability and productivity.
3Quantity of substance
If stoichiometric amounts of thiol and amine groups are used, then cost and waste are reduced, but unwanted reactions occur
Solution Approach 1:
The additive acts as a protective intermediary that prevents unwanted side reactions when stoichiometric amounts of thiol and amine groups are used. It selectively facilitates the desired conjugation reaction while suppressing competing reactions, enabling efficient use of reagents without compromising reaction selectivity.
Solution Approach 2:
The additive provides preliminary protection against unwanted reactions by preemptively suppressing side reaction pathways. This preliminary anti-action ensures that when stoichiometric amounts of reagents are used, the desired conjugation reaction proceeds selectively without competing side reactions.
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 enables efficient and cost-effective intermolecular conjugate production with improved stability, suitable for bioconjugates containing peptides, proteins, and drugs, reducing the need for excess thiol groups and enhancing product stability.
Implementation Method 1
the additive suppresses a product formed by a reaction between only the first reactant and the third reactant
Implementation Method 2
reacting an amine-containing component and a thiol-containing component with an ortho-phthalaldehyde
Data Source
AI summary
Disclosed are methods for constructing conjugates. An amine-containing component and a thiol-containing component, in comparable mole ratios, react with an ortho-phthalaldehyde in one step, to generate a conjugate bearing a substituted or an unsubstituted 1-thio-isoindole structure in the presence of an additive. The method provides a platform for the efficient and practical constructions of bioactive modular motifs.