Sugar Chain Derivative Production with High Beta Selectivity
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Solution Overview
Problem
The conventional ammonium carbonate method for introducing an amino group into sugar chains at the reducing terminal often results in a mixture of α and β anomers due to ring-opening of the unit sugar, leading to non-uniform sugar chain structures which can affect drug efficacy.
Innovation Solution
A method involving sugar chain asparagine hydrolase under basic conditions to selectively introduce an activating group at the reducing terminal, retaining the β configuration, using a compound with a sugar chain asparagine structure, and subsequent reaction with a leaving group to form a sugar chain compound with high β anomer purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ammonium carbonate method is used to introduce an amino group at the reducing terminal of the sugar chain, then the amino group can be introduced, but the unit sugar undergoes ring-opening resulting in a mixture of α and β anomers
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using formic acid instead of ammonium carbonate, and controlling the pH and temperature parameters to prevent ring-opening of the unit sugar, thereby achieving β-anomer selectivity while introducing the amino group
Solution Approach 2:
The invention uses formic acid as an intermediary substance that facilitates the introduction of the amino group while maintaining the cyclic structure of the unit sugar. The formic acid acts as a mediator that enables the reaction without causing ring-opening, thus preserving β-anomer purity
2Ease of manufacture
If the ammonium carbonate method is used, then the amino group can be introduced to the sugar chain, but ring-opening of the unit sugar occurs producing a mixture of α and β anomers
Solution Approach 1:
The invention modifies the reaction parameters by using formic acid as the reagent and controlling pH and temperature conditions to prevent ring-opening of the unit sugar, thereby maintaining structural uniformity and β-anomer purity during amino group introduction
Solution Approach 2:
Formic acid serves as an intermediary that enables amino group introduction while preserving the stable cyclic structure of the unit sugar. This intermediary approach prevents the harmful ring-opening reaction that occurs with ammonium carbonate, thus maintaining composition stability
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 enables the production of sugar chain derivatives with superior β selectivity, higher purity, and increased yield, allowing for the manufacture of glycopeptides and glycoproteins with uniform β anomer structures.
Implementation Method 1
a step of applying a sugar chain asparagine hydrolase under basic conditions on a compound having the sugar chain asparagine structure
Implementation Method 2
reacting a compound represented by Formula (3) with a compound represented by Formula (4) to introduce the activating group to the nitrogen atom
Data Source
AI summary
When manufacturing a sugar chain compound having an activating group, there was a problem with the ammonium carbonate method that is the conventional technology that during the process of introducing an amino group at the reducing terminal of the sugar chain, the unit sugar located at the reducing terminal of the sugar chain is subjected to ring-opening, thus causing a mixture of α and β anomers to be produced. The present invention provides a method for manufacturing a sugar chain compound having an activating group with high β selectivity using a compound having a sugar chain asparagine structure as the source material by cleaving the sugar chain from the sugar chain peptide so that the reducing terminal of the sugar chain and the nitrogen atom derived from the asparagine side chain will remain in a bound state, and introducing an activating group to said nitrogen atom while retaining not only the covalent bond between the reducing terminal of said sugar chain and said nitrogen atom but also the β configuration. A novel sugar chain compound which is a β anomer and has an activating group is also provided as a compound of the present invention.