Dimethyl Fumarate Purification via Amine Catalyst
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Solution Overview
Problem
Current processes for preparing dimethyl fumarate often result in the presence of impurities such as dimethyl sulfate, monomethyl fumarate, and dimethyl maleate, which are undesirable and can be harmful, posing challenges in terms of corrosion, catalyst recovery, and waste disposal, and requiring improved methods for achieving high purity and industrial applicability.
Innovation Solution
A process involving the reaction of fumaric acid with an acyl halide in methanol, followed by treatment with a base, and subsequent isolation, which achieves a purity of at least 99.0% and reduces impurities like mineral acid anions, dimethyl maleate, and dimethyl sulfate to acceptable levels, without the need for column chromatography purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acid such as sulfuric acid is used as a catalyst in esterification reaction, then the esterification reaction can be promoted, but corrosion of reaction vessels occurs and catalyst recovery and waste disposal become problematic
Solution Approach 1:
The patent uses an amine base as an intermediary catalyst to promote the esterification reaction between fumaric acid and methanol. This amine catalyst achieves effective reaction promotion without causing corrosion to reaction vessels, thereby resolving the contradiction between reaction productivity and equipment safety.
2Productivity
If conventional esterification processes are used, then dimethyl fumarate can be produced, but impurities such as dimethyl sulfate, monomethyl fumarate, and dimethyl maleate are present
Solution Approach 1:
The patent employs specific parameter changes including using an amine base catalyst instead of acid catalyst, controlling reaction temperature, and adjusting reaction time to optimize the esterification process. These parameter changes enable high conversion to dimethyl fumarate while minimizing the formation of impurities such as dimethyl sulfate, monomethyl fumarate, and dimethyl maleate.
Solution Approach 2:
The patent converts the potential harm of incomplete reaction (which would leave starting materials) into a benefit by using the amine catalyst to drive the reaction to near-complete conversion, thereby minimizing both unreacted starting materials and side product formation, achieving high purity product.
3Manufacturing precision
If column chromatography purification is used, then high purity dimethyl fumarate can be achieved, but the process complexity and cost increase
Solution Approach 1:
The patent extracts and removes the need for complex column chromatography purification by using an amine base catalyst that directs the reaction to produce high purity dimethyl fumarate directly. The simple filtration step suffices to remove the catalyst and achieve the desired purity, eliminating the need for complex purification equipment and procedures.
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 process effectively produces dimethyl fumarate with high purity, minimizing genotoxic impurities and improving industrial viability by reducing the levels of mineral acid anions and other impurities, ensuring a safer and more stable pharmaceutical product.
Implementation Method 1
reacting fumaric acid with an acyl halide in methanol to obtain dimethyl fumarate
Implementation Method 2
subjecting dimethyl fumarate to treatment with a base
Data Source
AI summary
The present invention relates to a process for the preparation of dimethyl fumarate, a compound of formula I, in a purity of at least 99.0% as determined by HPLC, containing less than 400 ppm of an anion of a mineral acid and less than 5 ppm of dimethyl maleate.