Triazole Enantiomer Crystallization Using a Chiral Resolving Agent
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Solution Overview
Problem
Existing methods for producing specific enantiomers of triazole derivatives, such as the (−)-enantiomer, are costly and inefficient, necessitating a more economical alternative.
Innovation Solution
A method involving the addition of a specific chiral molecule to a triazole derivative racemate in a solvent for co-crystallization, followed by separation of the precipitated crystal and residual liquid, allowing for the preferential production of the (R)-enantiomer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a column of optical resolution is used for preparative separation of the triazole derivative racemate, then the (−)-enantiomer can be obtained with high purity, but the production cost increases significantly
Solution Approach 1:
A chiral resolving agent is introduced as an intermediary substance to facilitate the separation of enantiomers. The resolving agent forms diastereomeric salts with the racemic triazole derivative, enabling selective crystallization of one enantiomer. This intermediary approach replaces the expensive column chromatography method while achieving high enantiomer purity through controlled crystallization and filtration processes
Solution Approach 2:
The invention utilizes phase transition through controlled crystallization to separate enantiomers. By adjusting temperature, solvent composition, and saturation levels, the desired enantiomer is selectively precipitated as crystals from the solution. This phase-based separation method eliminates the need for expensive column chromatography while maintaining high manufacturing precision for obtaining the (−)-enantiomer
2Manufacturing precision
If conventional separation methods are used, then enantiomer separation can be achieved, but the process time and complexity increase
Solution Approach 1:
The resolving agent is added to the racemic mixture before crystallization, pre-forming diastereomeric complexes that have different solubility characteristics. This preliminary complex formation step simplifies the subsequent separation process by creating distinct phases that can be easily separated through filtration, reducing overall process time compared to conventional methods
Solution Approach 2:
The separation process is segmented into distinct stages: (1) formation of diastereomeric salts by adding resolving agent, (2) selective crystallization of one enantiomer-complex, (3) filtration to separate crystals from mother liquor, and (4) recovery of pure enantiomer. This segmentation allows each step to be optimized independently, reducing total process time while achieving effective enantiomer separation
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 production of the (R)-enantiomer of triazole derivatives, which can be used to create agricultural or horticultural chemicals with higher activity.
Implementation Method 1
addition of a specific chiral molecule to the racemate of a triazole derivative can allow co-crystallization of the chiral molecule with a (−)-enantiomer
Implementation Method 2
separating a precipitated crystal and a residual liquid
Data Source
AI summary
A method for producing an (R)-enantiomer of a triazole derivative. The method includes adding a chiral molecule represented by General Formula (IIa) or (IIb) to a triazole derivative represented by General Formula (I) in a solvent to perform crystallization, and separating a precipitated crystal and a residual liquid.