Pomalidomide Form A Preparation Without Dioxane
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Solution Overview
Problem
Existing processes for preparing Pomalidomide form A face challenges in achieving high yields and purity, particularly due to the use of solvents like dioxane and high temperatures, which limit scalability and efficiency.
Innovation Solution
A process involving the reaction of 3-nitrophthalic acid with acetic anhydride in toluene, followed by reaction with 3-aminoglutarimide hydrochloride in the presence of triethylamine and acetic acid, and subsequent reduction with Pd/C in dimethyl formamide, followed by purification using dimethyl sulfoxide and water, to obtain Pomalidomide form A without the need for dioxane and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dioxane solvent and high temperatures are used in the existing process, then the reaction proceeds effectively, but the scalability and efficiency are limited
Solution Approach 1:
The patent changes the solvent parameter from dioxane to dimethyl formamide and adjusts temperature parameters to avoid high temperatures, thereby improving scalability while maintaining reaction efficiency through optimized reaction conditions
Solution Approach 2:
The patent employs readily available solvents like dimethyl formamide and dimethyl sulfoxide that are easier to handle and dispose of compared to dioxane, facilitating larger scale production with reduced regulatory burden and cost
2Manufacturing precision
If the existing process is used to prepare Pomalidomide form A, then the product is obtained, but the yield and purity are not optimized
Solution Approach 1:
The patent introduces dimethyl formamide as an intermediary solvent in the reduction step and dimethyl sulfoxide as an intermediary solvent in the purification step, which facilitate better reaction control and product isolation, simultaneously improving both yield and purity
Solution Approach 2:
The patent optimizes reaction parameters including solvent type, temperature, and reaction time to achieve both high yield and high purity of Pomalidomide form A, resolving the contradiction between manufacturing precision and productivity
3Ease of manufacture
If dioxane solvent is used in the process, then the reaction proceeds, but cost-effective large-scale production is hindered
Solution Approach 1:
The patent replaces dioxane with dimethyl formamide and dimethyl sulfoxide, which are more cost-effective and easier to handle on large scale, removing the bottleneck for industrial production while maintaining process effectiveness
Solution Approach 2:
The patent changes the solvent system parameters to use more industrially friendly solvents that are less regulated and more economical, thereby enabling cost-effective large-scale production of Pomalidomide form A
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 process enhances yield and purity, allows for cost-effective large-scale production, and reduces particle size, improving API dissolution properties and eliminating the use of dioxane solvent and high temperatures.
Implementation Method 1
reducing the 2-(2, 6-dioxo-3-piperidyl)-4-nitro-isoindoline-1, 3-dione in presence of Pd/C and dimethyl formamide solvent to get pomalidomide form A
Implementation Method 2
dissolving the pomalidomide form A in dimethyl sulfoxide
Implementation Method 3
adding the reaction mass obtained in step b) to water... isolating pure pomalidomide form A
Data Source
AI summary
The present invention is related to an improved process for the preparation of Pomalidomide with higher yields and high purity. Particularly the present invention relates to form A preparation of Pomalidomide and its purification. wherein the present process doesn't involve use of dioxane solvent and avoids higher temperatures.