Perampanel Synthesis via Segmented Condensation
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Solution Overview
Problem
Current processes for producing Perampanel are inefficient, requiring many reaction steps and using expensive transition metal catalysts, making them unsuitable for industrial scale due to low yield and potential metal contamination.
Innovation Solution
The use of intermediates of Formula II and III in a simplified process that eliminates the need for transition metal catalysts, reducing reaction steps and achieving high yield and purity, with the ability to produce Perampanel in a polymorphically pure crystalline form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current processes for producing Perampanel are used, then Perampanel can be produced, but the process requires many reaction steps and uses expensive transition metal catalysts, resulting in low yield and potential metal contamination
Solution Approach 1:
The patent segments the synthesis into two main components: a pyridine intermediate (Formula II or III) and a phenylhydrazine derivative (Formula IV or V), which are prepared separately and then coupled. This segmentation allows for optimization of each step independently and eliminates the need for continuous multi-step processes with metal catalysts.
Solution Approach 2:
The patent extracts and eliminates the transition metal catalyst step from the synthesis pathway. By using a condensation reaction between the pyridine intermediate and phenylhydrazine derivative, the process removes the need for palladium or other metal catalysts that cause contamination and reduce yield in conventional processes.
2Reliability
If current processes for producing Perampanel are used, then Perampanel can be produced, but the process uses expensive transition metal catalysts, resulting in potential metal contamination
Solution Approach 1:
The patent extracts and eliminates the transition metal catalyst from the synthesis pathway. By using a condensation reaction between the pyridine intermediate and phenylhydrazine derivative, the process removes the need for palladium or other metal catalysts that cause contamination and reduce yield in conventional processes.
Solution Approach 2:
The patent replaces expensive, long-lasting metal catalysts with a simple, one-time condensation reaction that uses readily available reagents. The pyridine intermediate and phenylhydrazine derivative react directly under mild conditions without requiring costly catalytic materials, making the process both cheaper and cleaner.
3Productivity
If current processes for producing Perampanel are used, then Perampanel can be produced, but the process requires many reaction steps, making it unsuitable for industrial scale
Solution Approach 1:
The patent segments the synthesis into two main components: a pyridine intermediate (Formula II or III) and a phenylhydrazine derivative (Formula IV or V), which are prepared separately and then coupled. This segmentation allows for optimization of each step independently and eliminates the need for continuous multi-step processes with metal catalysts.
Solution Approach 2:
The patent merges the final coupling step into a single condensation reaction that directly forms the Perampanel molecule from the pyridine intermediate and phenylhydrazine derivative. This consolidation reduces the total number of steps from eight or six (in conventional processes) to just two main steps, making the process highly suitable for industrial scale-up.
Data Source
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AI summary
The present invention provides intermediates useful for the synthesis of Perampanel and processes employing said intermediates for preparing Perampanel. The invention also provides processes for making the intermediates, crystalline forms of the intermediates and the use of the crystalline forms for preparing Perampanel.