Solvent-Mediated Tafamidis Form 4 Crystallization
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Solution Overview
Problem
Existing processes for the preparation of crystalline Form 4 of tafamidis are inefficient and do not ensure high purity and stability of the final product.
Innovation Solution
A process involving the use of specific solvents and acids to react tafamidis meglumine, followed by combining the reaction mixture with additional solvents to obtain crystalline Form 4 of tafamidis, ensuring purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing processes are used for preparing crystalline Form 4 of tafamidis, then the preparation can be performed, but the process efficiency is low and the product purity and stability are not ensured
Solution Approach 1:
The patent applies parameter changes by systematically optimizing solvent types (amides, sulfoxides, carboxylic acids), their combinations, ratios, and processing conditions (temperature, time) to transform the preparation process into one that achieves both high efficiency and high purity crystalline Form 4 of tafamidis
Solution Approach 2:
The patent uses specific solvents and solvent combinations as intermediaries to facilitate the conversion of tafamidis meglumine to crystalline Form 4 of tafamidis, where the solvents mediate the transformation while ensuring high purity and stability of the final product
2Productivity
If existing processes are used for preparing crystalline Form 4 of tafamidis, then the preparation can be performed, but the product stability is not ensured
Solution Approach 1:
The patent optimizes processing parameters including solvent selection, temperature control, and reaction time to ensure the prepared crystalline Form 4 of tafamidis maintains high stability and does not transform into other polymorphic forms during storage
Solution Approach 2:
The patent employs specific solvent systems and processing conditions that preemptively prevent polymorphic transformation by creating a stable crystalline structure during the preparation process, thereby ensuring long-term stability without requiring additional stabilization steps
3Manufacturing precision
If existing processes are used, then preparation can be performed, but high purity (≥99.0%) and freedom from other polymorphs cannot be ensured
Solution Approach 1:
The patent achieves high purity (≥99.0%) by precisely controlling solvent composition, ratios, and processing parameters, which simplifies the overall process by eliminating the need for complex purification steps while ensuring the product is free from other polymorphic forms
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 process achieves crystalline Form 4 of tafamidis with high purity (≥99.0%) and stability, free from detectable quantities of other polymorphs, and maintains its polymorphic form over extended periods.
Implementation Method 1
reacting the solution of the step (a) with an acid to form a reaction mixture
Implementation Method 2
obtaining crystalline Form 4 of tafamidis from the reaction mixture of the step (b) by combining the reaction mixture with a second solvent
Implementation Method 3
combining the reaction mixture with a second solvent selected from the group consisting of (C1-C8) alcohols, (C3-C10) ketones, (C1-C3) nitriles, water and a mixture thereof
Data Source
AI summary
The present invention relates to a process for the preparation of crystalline Form 4 of tafamidis from tafamidis meglumine salt.