N-Acetylcysteine Amide Synthesis Without Chromatography
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Solution Overview
Problem
Current methods for synthesizing N-Acetyl Cysteine Amide (NACA) face challenges in achieving high chemical yields and enantiomeric purity without the need for chromatography.
Innovation Solution
A process involving the reaction of cystine with an alcohol and a chlorinating reagent to form L-cystine dimethylester dihydrochloride, followed by conversion to di-N-acetylcystine dimethylester and subsequent reduction to N-acetylcysteine amide using dithiothreitol, triethylamine, and an alcohol, without the use of metals, to achieve high chemical and enantiomeric purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to prepare NACA, then the synthesis process can be completed, but the chemical yield and enantiomeric purity are insufficient and chromatography is required
Solution Approach 1:
The patent applies preliminary action by using L-cystine (an optically pure starting material) to establish enantiomeric purity at the beginning of the synthesis process. This preliminary selection of chiral starting material ensures that the final NACA product achieves high enantiomeric purity without requiring chromatographic separation, while simultaneously maintaining high chemical yield through the efficient reaction pathway.
2Ease of manufacture
If conventional synthesis methods are used, then the synthesis can proceed, but the process complexity increases due to the need for chromatography
Solution Approach 1:
The patent applies the taking out principle by eliminating the chromatography step from the synthesis process. By using L-cystine as the starting material and optimizing the reaction conditions (esterification, acetylation, and amidation steps), the method achieves high enantiomeric purity directly, allowing the removal of the complex chromatography device and simplifying the overall manufacturing process.
3Manufacturing precision
If high enantiomeric purity is achieved through conventional methods, then product quality is improved, but the synthesis time and processing steps increase
Solution Approach 1:
The patent applies merging by combining multiple objectives into a unified synthesis pathway. The method simultaneously achieves high chemical yield, high enantiomeric purity, and reduced synthesis time by integrating the esterification, acetylation, and amidation steps in a coordinated sequence using L-cystine as the starting material, eliminating the need for time-consuming chromatographic purification.
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 effectively produces NACA in high chemical yields and enantiomeric purity, overcoming the limitations of previous synthesis methods by eliminating the need for chromatography and ensuring high product quality.
Implementation Method 1
reducing dried di-N-acetylcystine dimethylester into N-acetylcysteine amide with dithiothreitol, triethylamine and an alcohol
Data Source
AI summary
The present invention includes methods for making and isolating N-acetylcysteine amide, (2R,2R′)-3,3′-disulfanediyl bis(2-acetamidopropanamide, diNACA), intermediates and derivatives thereof comprising: contacting cystine with an alcohol and a chlorinating reagent to form an organic solution containing L-cystine dimethylester dihydrochloride; combining dried or undried L-cystine dimethylester dihydrochloride with a triethylamine, an acetic anhydride, and an acetonitrile to form a di-N-acetylcystine dimethylester; mixing dried di-N-acetylcystine dimethylester with ammonium hydroxide to form a di-N-acetylcystine amide (diNACA); and separating dried di-N-acetylcystine dimethylester into N-acetylcysteine amide with dithiothreitol, triethylamine and an alcohol.