Pomalidomide Crystalline Form I Reproducible Process
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Solution Overview
Problem
Existing processes for preparing and purifying pomalidomide crystalline Form I lack consistency and efficiency, resulting in variable stability, solubility, and purity levels, which affect its pharmaceutical properties and commercial viability.
Innovation Solution
A novel process involving suspension of pomalidomide in dimethylformamide, dimethylacetamide, or dimethyl sulfoxide, followed by heating and addition of an anti-solvent to obtain consistently reproducible pomalidomide crystalline Form I, and a separate process involving suspension in an organic solvent, heating, carbon treatment, and optional addition of solvents to achieve high-purity pomalidomide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing processes for preparing and purifying pomalidomide are used, then production can be achieved, but consistency and efficiency are poor resulting in variable stability, solubility, and purity levels
Solution Approach 1:
The patent changes the solvent parameter from conventional solvents to dimethylformamide, dimethylacetamide, or dimethyl sulfoxide, and specifies precise temperature parameters (heating above 70°C, reflux temperature) to achieve consistent crystalline Form I with high purity and reproducibility
Solution Approach 2:
The patent utilizes phase transition by heating the suspension above 70°C to dissolve pomalidomide, then adding anti-solvent to induce crystallization, achieving consistent formation of crystalline Form I with controlled purity and stability
2Manufacturing precision
If existing purification processes are used, then pomalidomide can be obtained, but purity levels are variable and impurities remain above acceptable thresholds
Solution Approach 1:
The patent extracts impurities from pomalidomide by suspending in dimethylformamide, dimethylacetamide, or dimethyl sulfoxide followed by carbon treatment and filtration, removing colored impurities and achieving purity greater than 99.5%
Solution Approach 2:
The patent uses carbon as an intermediary substance to adsorb and remove impurities from the pomalidomide solution during the purification process, achieving high purity levels
3Reliability
If conventional crystallization methods are used, then pomalidomide can be obtained, but the crystalline form is not consistently reproducible
Solution Approach 1:
The patent specifies precise parameter changes including using dimethylformamide, dimethylacetamide, or dimethyl sulfoxide as solvents, heating above 70°C, and adding specific anti-solvents to consistently obtain crystalline Form I with reproducible X-ray diffraction patterns
Solution Approach 2:
The patent controls phase transition from dissolved state to crystalline state by heating above 70°C to dissolve, then adding anti-solvent to induce crystallization of Form I, ensuring consistent and reproducible crystalline structure
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 processes ensure the production of consistently reproducible pomalidomide crystalline Form I with high purity (>99.5%) and minimal impurities, enhancing stability and commercial acceptance.
Implementation Method 1
heating the suspension obtained in step (a) above 70° C.
Implementation Method 2
adding anti-solvent to the solution obtained in step (b); and isolating pomalidomide crystalline Form I
Implementation Method 3
heating the suspension obtained in step (a) at reflux
Implementation Method 4
treating the solution obtained in step (b) with carbon
Data Source
AI summary
The present invention provides a novel process for the preparation of pomalidomide crystalline Form I. The present invention also provides a process for the purification of pomalidomide.