Dronedarone Synthesis Without Base Catalyst
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Solution Overview
Problem
Current methods for obtaining dronedarone are inefficient, requiring long reaction times and the use of toxic halogenated solvents, with cumbersome purification processes like column chromatography, lacking an industrial method using safe and accessible reactants and solvents.
Innovation Solution
A process involving the reaction of 5-amino-3-[4-(3-di-n-butylamino-propoxy)benzoyl]-2-n-butylbenzofuran with methane sulfonyl chloride in a non-polar solvent without a base, followed by potential acid treatment to form pharmaceutically acceptable salts, significantly reducing reaction time and eliminating the need for column chromatography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods using halogenated solvents and base catalysts are employed, then the reaction can proceed, but the process requires long reaction times (over 10 hours), uses toxic solvents, and needs complex purification procedures
Solution Approach 1:
The invention changes the solvent parameter from halogenated solvents (dichloromethane, chloroform) to non-polar hydrocarbon solvents (toluene, xylene, heptane). This parameter change eliminates the toxicity issue while maintaining reaction effectiveness. The base catalyst parameter is also changed by using no base or minimal base, further simplifying the process and reducing harmful factors.
Solution Approach 2:
The invention extracts and removes the base catalyst component from the reaction system. By conducting the reaction without base or with minimal base in non-polar solvents, the process eliminates the need for complex workup procedures and reduces harmful factors associated with base handling and disposal.
2Manufacturing precision
If conventional purification methods like column chromatography are used, then product purity can be achieved, but the process becomes cumbersome and time-consuming
Solution Approach 1:
The reaction system performs self-purification through selective solubility in non-polar solvents. The desired product and byproducts partition differently in the non-polar solvent system, allowing simple filtration and concentration to achieve high purity without requiring complex column chromatography apparatus and procedures.
3Productivity
If conventional methods are used, then dronedarone can be synthesized, but the overall process efficiency is low due to long reaction times and complex procedures
Solution Approach 1:
The invention merges the reaction and purification steps into a single operation. By conducting the reaction in non-polar solvents without base, the reaction mixture directly yields the product in high purity upon simple filtration and concentration, eliminating the need for separate purification steps and significantly reducing total process time.
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 method achieves good yields and purity in less than 10 hours, making it industrially viable and environmentally friendly, with reproducible results suitable for industrial scale production without the need for toxic solvents or complex purification.
Implementation Method 1
5-amino-3-[4-(3-di-n-butylamino-propoxy)benzoyl]-2-n-butylbenzofuran (I) is reacted with methane sulfonyl chloride without the addition of a base, to give dronedarone
Data Source
AI summary
The present invention provides a process for obtaining dronedarone or salts thereof characterized in that in an organic phase comprising one or more non-polar solvents, 5-amino-3-[4-(3-di-n-butylaminopropoxy)benzoyl]-2-n-butyl-benzofuran is reacted with methane sulfonyl chloride without the addition of a base. The invention also provides a process for obtaining intermediates of dronedarone environmentally friendly and industrially viable.