Purifying cis-5-Hydroxy-2-Piperidinecarboxylic Acid via Lactone Crystallization
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Solution Overview
Problem
Current methods for producing highly pure cis-5-hydroxy-2-piperidinecarboxylic acid are inefficient due to difficulties in selectively synthesizing and purifying the compound from isomers, often requiring expensive catalysts, complex processes, and excessive reagents, making them unsuitable for industrial production.
Innovation Solution
A method involving the reaction of cis-5-hydroxy-2-piperidinecarboxylic acid with an acid halide and/or acid anhydride to convert it into a lactone, followed by crystallization and solvent extraction to separate impurities, allowing for the regeneration of highly pure cis-5-hydroxy-2-piperidinecarboxylic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical synthesis methods using L-amino acid are used to fix stereochemistry, then stereoselectivity is improved, but device complexity and cost increase due to expensive catalysts and complex processes
Solution Approach 1:
The patent extracts the purification step from the synthesis pathway by converting the crude mixture into a derivative form (lactone or ester) that enables simple separation of isomers through crystallization or extraction, avoiding complex synthesis procedures
Solution Approach 2:
The patent changes the chemical form of the compound by converting cis-5-hydroxy-2-piperidinecarboxylic acid into its derivative (lactone or ester), which alters the physical and chemical properties to enable effective separation of isomers through crystallization or extraction
2Manufacturing precision
If ion-exchange column separation is used to separate isomers, then purity is improved, but productivity decreases due to excessive amounts of filler and eluent required
Solution Approach 1:
The patent utilizes phase transition (crystallization) to separate isomers, where the derivative of the desired isomer crystallizes from the solution while impurities remain in the mother liquor, providing simple and efficient separation without requiring large amounts of column materials
Solution Approach 2:
The patent replaces expensive and cumbersome ion-exchange columns with simple, inexpensive operations such as crystallization and solvent extraction that can be performed in standard laboratory equipment, making the process suitable for industrial production
3Manufacturing precision
If lactonization is used to purify the compound, then separation of isomers is improved, but harmful factors increase due to side reactions between lactone and residual trans isomer
Solution Approach 1:
The patent performs preliminary protection of the amino group before lactonization to prevent side reactions during the subsequent steps, ensuring that the lactone formation proceeds cleanly without unwanted reactions with residual trans isomer
Solution Approach 2:
The patent introduces an intermediate protected derivative form that mediates between the crude mixture and the final pure compound, allowing selective transformation and separation while minimizing harmful 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 method effectively purifies cis-5-hydroxy-2-piperidinecarboxylic acid by selectively converting it into a lactone or ester, enabling the removal of impurities and achieving high purity levels with reduced costs and process complexity, suitable for industrial production.
Implementation Method 1
reacting cis-5-hydroxy-2-piperidinecarboxylic acid with an acid halide and/or acid anhydride to convert the cis-5-hydroxy-2-piperidinecarboxylic acid into a compound of Formula (1)
Implementation Method 2
crystallization and solvent extraction to separate impurities
Implementation Method 3
crystallization and solvent extraction to separate impurities
Data Source
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AI summary
The present invention aims to provide a method for purifying cis-5-hydroxy-2-piperidinecarboxylic acid with high purity, and a method for producing its derivative. The present invention provides a method for producing a cis-5-hydroxy-2-piperidinecarboxylic acid derivative, which method comprises a step of converting cis-5-hydroxy-2-piperidinecarboxylic acid into a compound(s) of Formula (1) and/or Formula (2) (wherein R1 represents a protective group for an amino group, and R2 represents a C1-C6 alkyl group), and a method for purifying cis-5-hydroxy-2-piperidinecarboxylic acid.