Agomelatine Acid Radical Complex Solubility and Purity
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Solution Overview
Problem
Current methods for producing Agomelatine fail to achieve a stable acid radical complex with high purity, defined crystallographic form, and improved solubility, which are crucial for pharmaceutical formulations.
Innovation Solution
The formation of Agomelatine acid radical complexes through reactions with specific acids like sulfuric acid and methanesulfonic acid, utilizing hydrogen bonding to create stable complexes, is achieved by dissolving Agomelatine in an organic solvent, adding the corresponding acid, and crystallizing or precipitating the product, followed by washing and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Agomelatine is reacted with common acids to form complexes, then solubility may be improved, but the purity, crystallographic form definition, and reproductivity deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling reaction temperature (0-25°C), acid-to-agomelatine ratios (1:1 to 3:1), solvent types (dichloromethane, chloroform, acetone, alcohols), and pH values (2-4) to achieve optimal complex formation. These parameter optimizations enable simultaneous achievement of high solubility improvement while maintaining high purity (>98%), defined crystallographic forms, and excellent reproductivity
Solution Approach 2:
The patent uses organic solvents as intermediaries to facilitate the reaction between Agomelatine and acids. The solvents (dichloromethane, chloroform, acetone, C1-C4 alcohols) mediate the complex formation process, enabling controlled reaction conditions that produce high-purity complexes with defined crystal structures while improving solubility
2Manufacturing precision
If Agomelatine is reacted with specific acids to form stable complexes, then purity and reproductivity are improved, but the complexity of the preparation process increases
Solution Approach 1:
The patent applies preliminary action by pre-dissolving Agomelatine in organic solvents before adding acids, and pre-preparing acid solutions in specific solvents. This preliminary preparation ensures homogeneous mixing and controlled reaction conditions, leading to high purity complexes with consistent crystallographic forms while maintaining relatively simple操作流程
Solution Approach 2:
The patent optimizes reaction parameters including temperature (0-25°C), acid ratios (1:1 to 3:1), solvent selection, and pH control (2-4) to achieve high purity and reproductivity. These parameter optimizations enable the process to maintain simplicity while achieving excellent manufacturing precision
3Productivity
If reaction temperature is increased to improve reaction speed, then productivity is improved, but the quality of crystal formation and yield deteriorate
Solution Approach 1:
The patent optimizes reaction temperature parameters within the range of 0-25°C, with preferred temperatures of 0-10°C for sulfuric acid complexes and 10-25°C for methanesulfonic acid complexes. This temperature optimization achieves the best balance between reaction speed, crystal quality, and yield, with yields reaching 90-98%
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 resulting Agomelatine acid radical complexes exhibit enhanced purity, reproducibility, and solubility, making them more suitable for pharmaceutical preparations and improving bioavailability.
Implementation Method 1
the Agomelatine compound can react with specific acids containing sulfur, oxygen (HX = H2SO4, CH3SO3H), forming stable complex via hydrogen bond
Implementation Method 2
dissolving Agomelatine in an organic solvent before adding the corresponding HX acid
Implementation Method 3
crystallizing or precipitating out the product after reaction
Implementation Method 4
crystallizing or precipitating out the product after reaction
Implementation Method 5
washing and drying the crystallization or precipitation product
Implementation Method 6
washing and drying the crystallization or precipitation product
Data Source
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AI summary
The present invention relates to an Agomelatine acid radical complex in formula (I) and the preparation method thereof (HX = H2SO4, RSO3H (R = CH3, Ph, 4-CH3Ph)). The solubility of the Agomelatine acid radical complex obtained by the method of the present invention is significantly improved compared with Agomelatine, has good stability and higher purity, and is suitable for application in finished-product medicinal preparations. The preparation process is quite simple, and a product with high purity can be obtained without special operations. (HX = H2SO4, RSO3H(R= CH3, Ph or 4-CH3Ph)).