Polyethylene Glycol Substituted Acyl Borates for Aqueous Amide Bond Formation
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Solution Overview
Problem
Current methods for forming covalent bonds between large molecules are inefficient, often requiring anhydrous solvents, high concentrations, long reaction times, and excess reagents, and typically result in unnatural bonds that are immunogenic or unstable.
Innovation Solution
Polyethylene glycol substituted acyl borates facilitate the formation of amide bonds between polyethylene glycol units and hydroxylamine-bearing macromolecules, allowing for rapid, selective, and efficient conjugation in aqueous conditions without the need for additional reagents or catalysts, using equimolar amounts of reactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic reactions are used to join large molecules, then covalent bonds can be formed, but the reactions require anhydrous solvents and do not operate properly in the presence of unprotected organic functional groups
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using acyl borates with hydroxylamine, which enables the reaction to proceed in aqueous environments and tolerate unprotected functional groups. This parameter change transforms the reaction conditions from requiring anhydrous solvents to accepting aqueous conditions, thereby resolving the contradiction between bond formation reliability and compatibility with unprotected functional groups
2Reliability
If conventional organic reactions are used to join large molecules, then covalent bonds can be formed, but the reactions are too slow requiring high concentrations, long reaction times, and large excess of one reactant
Solution Approach 1:
The invention changes the kinetic parameters of the reaction by employing acyl borate and hydroxylamine chemistry, which proceeds at significantly faster rates than conventional methods. This allows the reaction to achieve high productivity with equimolar amounts of reactants, short reaction times, and low concentrations, while maintaining reliable bond formation
Solution Approach 2:
The acyl borate acts as a reactive intermediary that facilitates rapid amide bond formation with hydroxylamine. This intermediary species enables the reaction to proceed through a low-energy transition state, dramatically increasing the reaction rate and allowing equimolar conjugation without requiring large excesses of reactants or prolonged reaction times
3Reliability
If conventional conjugation methods are used, then bonds can be formed between macromolecules and PEG, but the bonds formed are unnatural and can be problematic, immunogenic, or unstable
Solution Approach 1:
The invention changes the chemical nature of the bond formation process by using acyl borate with hydroxylamine, which produces natural amide bonds identical to those found in native proteins. This parameter change ensures the bonds are chemically stable, non-immunogenic, and structurally natural, resolving the contradiction between bond formation capability and bond stability/naturalness
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 the formation of stable, natural amide bonds even in the presence of unprotected functional groups, achieving high chemoselectivity and fast reaction kinetics, suitable for synthesizing large molecules like proteins and peptides with improved economic and purification efficiency.
Implementation Method 1
The present invention refers to polyethylene glycol substituted acyl borates, to methods for their preparation, and to the use of said polyethylene glycol substituted acyl borates for the preparation of polyethylene glycol substituted macromolecules
Data Source
AI summary
Polyethylene glycol substituted acyl borates, methods for their preparation, and the use of the polyethylene glycol substituted acyl borates for the preparation of polyethylene glycol substituted macromolecules. The polyethylene glycol substituted acyl borate has the general formula (I)wherein PEG denotes a polyethylene glycol-based substituent; a is an integer from 1 to 12; X1, X2, and X3 are independently of one another selected from the group made of F, OR, N+R3, N+R2OR, N+R2SR, and N+R2NR2, and are optionally forming a cyclic or a bicyclic structure; and R is an organic substituent or H.