Silane Cyclic Dipeptide Intermediate for Stereoselective Polypeptide Synthesis
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Solution Overview
Problem
Conventional peptide synthesis methods are inefficient, costly, and difficult to achieve high stereoselectivity and efficiency due to the use of carboxylic acid activation leading to racemization, and lack effective catalysts for amidation reactions, resulting in high by-product formation and purification costs.
Innovation Solution
A novel silane-containing fused ring dipeptide compound is synthesized through a reaction between a specific silyl dihalide and a silane compound with a nitrogen-containing heterocyclic group, followed by reactions with amino acid esters, allowing for efficient synthesis of polypeptides by extending the N- and C-termini of the dipeptide in succession.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If carboxylic acid activation method is used for amidation reaction, then amide bond formation can be achieved, but racemization occurs quickly and stereoselectivity deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by introducing a silicon-containing compound as a new reagent type, replacing the conventional carboxylic acid activation method. This parameter change fundamentally alters the reaction mechanism to avoid racemization while maintaining amide bond formation capability, achieving high stereoselectivity in peptide synthesis
Solution Approach 2:
The silicon-containing compound acts as an intermediary reagent that facilitates amide bond formation through a different mechanistic pathway. Instead of directly activating the carboxylic acid (which causes racemization), the silicon compound mediates the reaction through silyl ester formation and subsequent nucleophilic substitution, eliminating the racemization problem while preserving stereoselectivity
2Ease of manufacture
If conventional amidation reaction mode is used, then amide bond can be formed, but by-products are formed and purification costs increase
Solution Approach 1:
The invention converts the potential harm of by-product formation into a benefit by designing a reaction system where the by-products are volatile silicon-containing compounds that can be easily removed. The silicon-containing reagent transforms unwanted side products into removable species, simplifying purification and reducing loss of valuable peptide materials
Solution Approach 2:
The reaction utilizes phase transition properties of silicon-containing by-products, which volatilize under reaction conditions or during workup. This phase change from liquid/solid reaction mixture to gaseous by-products enables simple removal through evaporation or filtration, dramatically easing purification and reducing material loss
3Productivity
If multi-stage reactions are used for peptide synthesis, then complete peptide can be synthesized, but synthesis efficiency deteriorates due to repeated purification steps
Solution Approach 1:
The invention merges multiple reaction steps into a streamlined sequence by using the silicon-containing compound as a universal reagent for amide bond formation. The reaction protocol combines coupling, cyclization, and purification steps into an integrated one-pot process, eliminating intermediate isolations and dramatically improving synthesis efficiency while reducing time loss
Solution Approach 2:
The reaction system maintains continuous useful action throughout the synthesis process by preventing precipitation of intermediates and maintaining reactants in solution. The silicon-containing reagent ensures all transformation steps proceed continuously without interruption for filtration or re-dissolution, maximizing productivity and minimizing time loss across multiple synthesis stages
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
The method enables high-yield production of polypeptides with high stereoselectivity and efficiency, reducing the need for multiple reaction stages and by-product formation, thus lowering costs and improving synthesis efficiency.
Implementation Method 1
a reaction between a specific silyl dihalide and a specific silane compound substituted with a nitrogen-containing heterocyclic group
Data Source
AI summary
The present invention provides, as a novel compound that can be utilized for efficient synthesis or the like of a polypeptide comprising various amino acids, a silane-containing condensed cyclic dipeptide compound represented by formula (A). In formula (A), each of R11, R12, R13, R21, and R22 independently represents a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a nitro group, a cyano group, or a thiol group, or a monovalent aliphatic hydrocarbon group, aromatic hydrocarbon group, or heterocyclic group that may have one or more substituents; and each of Ra1 and Ra2 independently represents a monovalent aliphatic hydrocarbon group or aromatic hydrocarbon group that may have one or more substituents