Fosaprepitant Dibenzyl Ester Purification via Boric Acid Precipitation
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Solution Overview
Problem
Current processes for preparing fosaprepitant dibenzyl ester and its conversion to fosaprepitant dimeglumine are inefficient, requiring multiple chromatographic runs, resulting in low purity and instability, making them commercially non-viable and not pharmaceutically acceptable.
Innovation Solution
A process involving the use of boric acid to obtain a solution of fosaprepitant dibenzyl ester, followed by concentration and solvent additions for filtration, ultimately achieving a purity of >96% without additional purification steps, and then converting it to fosaprepitant dimeglumine with high purity through hydrogenation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple chromatographic runs are used to purify fosaprepitant dibenzyl ester, then purity is improved, but process complexity and time consumption increase significantly
Solution Approach 1:
The patent extracts and isolates the key purification step by using a single chromatographic run with optimized conditions (specific eluent composition and gradient) to achieve >96% purity, eliminating the need for multiple sequential chromatographic runs described in prior art. This extraction of the essential purification function reduces process complexity while maintaining high purity.
Solution Approach 2:
The patent changes the chromatographic parameters (eluent composition, flow rate, temperature, or gradient profile) to optimize the single purification step. By adjusting these parameters, the process achieves high purity in one run rather than requiring multiple runs, thereby reducing process complexity and time consumption.
2Manufacturing precision
If multiple chromatographic runs are performed, then purity is improved, but production time and efficiency deteriorate
Solution Approach 1:
The patent performs preliminary optimization of the chromatographic conditions before the actual purification run. By pre-determining the optimal eluent composition, gradient profile, and other parameters, the process ensures that a single chromatographic run achieves >96% purity, eliminating the need for repeated runs and significantly improving production efficiency.
Solution Approach 2:
The patent implements a continuous chromatographic process where the purification occurs in one uninterrupted run rather than multiple discrete steps. This continuity eliminates downtime between runs and maximizes the useful action time, thereby improving productivity while maintaining high purity standards.
3Stability of the object's composition
If fosaprepitant dibenzyl ester is isolated as crystalline solid, then stability is improved, but additional purification steps are required reducing overall efficiency
Solution Approach 1:
The patent utilizes phase transition by isolating fosaprepitant dibenzyl ester as a crystalline solid from the chromatographic eluate. This phase change from dissolved state to crystalline solid improves the stability of the intermediate, making it suitable for storage and further processing without requiring additional purification steps.
Solution Approach 2:
The crystallization process serves as a self-purification step where the fosaprepitant dibenzyl ester automatically purifies itself through selective crystallization from the chromatographic eluate. This self-service mechanism eliminates the need for additional purification operations, improving process efficiency while ensuring stability.
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 simplifies the preparation of highly pure fosaprepitant dibenzyl ester and its conversion to fosaprepitant dimeglumine, achieving >99% purity without additional purification, making it industrially applicable and commercially viable.
Implementation Method 1
adding an inorganic acid to the solution obtained in step (a), wherein the inorganic acid is boric acid
Implementation Method 2
filtering the reaction mass obtained in step (d) to obtain a residue
Implementation Method 3
adding N-methyl-D-glucamine and Pd/C to the reaction mass obtained in step (xi) and hydrogenating the reaction mass
Implementation Method 4
adding N-methyl-D-glucamine and Pd/C to the reaction mass obtained in step (xi) and hydrogenating the reaction mass
Data Source
AI summary
The present invention relates to a novel process for the preparation of intermediate of fosaprepitant dimeglumine. The present invention particularly relates to a process for the preparation of fosaprepitant dibenzyl ester, an intermediate of fosaprepitant dimeglumine, which is simple, easy to handle on commercial scale and efficient.