Sulfonamide Intermediate Synthesis for High Purity
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Solution Overview
Problem
The existing methods for preparing sulfonamide compounds, such as diclosulam, face challenges due to low yield and low purity due to high steric hindrance and poor solubility in conventional solvents, making it difficult to achieve high-purity products.
Innovation Solution
A method involving reacting a crude sulfonamide compound with a solvent, base, and catalyst to transform it into a freely soluble intermediate, followed by purification and hydrolysis to achieve high-purity sulfonamide compounds, using specific reagents and conditions like 4-dimethylaminopyridine, triethylamine, and halohydrocarbons or ethers as solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional condensation reaction is used to prepare sulfonamide compounds, then the reaction can proceed, but the yield is low and purity is low due to high steric hindrance
Solution Approach 1:
The patent introduces a protective group (such as acetyl, benzoyl, or p-methoxybenzoyl) as an intermediary on the nitrogen atom of the sulfonamide compound. This protective group acts as a mediator that reduces steric hindrance during the condensation reaction, enabling the reaction to proceed more efficiently. After the reaction is complete, the protective group is removed to yield the final high-purity sulfonamide compound. This intermediary approach resolves the contradiction by temporarily modifying the molecular structure to facilitate the reaction, then restoring the original structure afterward.
2Manufacturing precision
If base-dissolving acid-crystallizing method is used for purification, then some purification can be achieved, but it cannot effectively remove triazolopyrimidine sulfonic acid impurity
Solution Approach 1:
The patent changes the purification parameters by using selective chemical reactions instead of conventional base-dissolving acid-crystallizing methods. Specifically, the patent employs protective group chemistry where the impurity (triazolopyrimidine sulfonic acid) does not form the protective group under the same conditions as the desired product, or the impurity can be selectively removed through hydrolysis or other decomposition reactions. This parameter change in the purification approach enables effective separation of the impurity while maintaining high product purity.
3Manufacturing precision
If recrystallization method is used, then high purity can be achieved, but it is difficult to obtain high-purity product due to low solubility in conventional solvents
Solution Approach 1:
The patent changes the solubility parameter by introducing a protective group on the nitrogen atom of the sulfonamide compound. This structural modification significantly improves the solubility of the compound in conventional organic solvents, enabling effective recrystallization. The protected intermediate compound can be easily dissolved and recrystallized to high purity, and after removing the protective group, the final high-purity sulfonamide compound is obtained. This parameter change resolves the solubility issue while maintaining ease of operation.
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 high-purity sulfonamide compounds with HPLC purity reaching 99.9% or higher, using cost-effective reagents and simplifying the production process, enhancing its application in scientific research and industrial production.
Implementation Method 1
reacting with a compound of a formula (II) under the action of a solvent, a base and a catalyst by taking a crude product of a sulfonamide compound (I) as an initial raw material, so as to synthesize a compound of a formula (III)
Implementation Method 2
enabling the compound represented by the formula (III) to react with a base or an acid in a solvent, thereby obtaining the high-purity sulfonamide compound (I)
Data Source
AI summary
The present invention discloses a sulfonamide compound (III) which is intermediately produced in a process for preparing a high-purity sulfonamide compound (I). The preparation comprises the following steps: a, taking a crude product of a sulfonamide compound (I) as an initial raw material, and enabling the raw material to react with a compound of a formula (II) in presence of alkali and a catalyst so as to synthesize an intermediate of a formula (III); and b, enabling the compound represented by the formula (III) to react with alkali or acid, thereby obtaining the high-purity sulfonamide compound (I).