Procysteine Synthesis via Triphosgene for High Purity
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Solution Overview
Problem
Current methods for producing 2-oxothiazolidine-4-carboxylic acid (procysteine) are cumbersome, slow, and result in low yield with maximum purity of 98% or less, allowing toxic impurities that can cause deleterious side effects, necessitating a faster, more efficient, and high-yield method for producing high purity procysteine for treating disease conditions and increasing cellular glutathione levels.
Innovation Solution
A method involving reacting L-cysteine with triphosgene in toluene, followed by cooling, concentrating, drying, isolating, and washing the product to achieve a purity range of 95% to 100%, specifically adjusting pH and temperature conditions to ensure high purity and efficiency, resulting in a composition like Cellactin that is free from toxic impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current manufacturing methods are used, then production can be maintained, but purity is limited to maximum 98% allowing toxic impurities
Solution Approach 1:
The patent changes the chemical reaction parameters by using triphosgene in toluene solution instead of conventional reagents, and controls the reaction at specific temperature ranges (0-30°C) to achieve superior purity of 98-100% while eliminating toxic impurities
Solution Approach 2:
The patent extracts and removes toxic impurities through a systematic washing process using water and pH adjustment, achieving complete elimination of harmful byproducts while maintaining high purity of the procysteine product
2Productivity
If current manufacturing methods are used, then production can continue, but the process is cumbersome and slow
Solution Approach 1:
The patent combines multiple reaction steps into a single efficient process where L-cysteine reacts with triphosgene in toluene to directly form procysteine, eliminating the need for separate protection and deprotection steps required in conventional methods
Solution Approach 2:
The patent performs preliminary dissolution of triphosgene in toluene before the main reaction, and pre-cools the reaction mixture to controlled temperatures, enabling a faster and more efficient reaction process with reduced complexity
3Productivity
If current manufacturing methods are used, then production can be maintained, but yield is low
Solution Approach 1:
The patent optimizes reaction parameters including using triphosgene in toluene solution at controlled temperatures (0-30°C) and specific pH conditions (adjusted to pH 2-3), which dramatically improves reaction efficiency and achieves high yield with minimal material loss
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 method produces procysteine with a purity of 98% to 100%, effectively increasing cellular glutathione levels and treating various disease conditions without toxic side effects, as demonstrated by clinical trials, offering a safer and more effective treatment option compared to existing methods.
Implementation Method 1
reacting L-cysteine with triphosgene dissolved in toluene
Implementation Method 2
cooling the solution to a temperature in the range of about 0-30 degrees C.
Implementation Method 3
isolating and washing the product, drying the product, testing the product for purity, and rewashing until the product reaches a purity in a range of from about 95 percent to about 100 percent
Data Source
AI summary
Provided herein is a composition, method of manufacture, and method for treating a disease condition and/or raising cellular levels of glutathione, the composition comprising L-2-oxothiazolidine-4-carboxylate, (procysteine) having a purity of at least 99 to 99.5 percent.