Acylated Amphetamine Synthesis via Phase Extraction
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Solution Overview
Problem
Current processes for preparing L-lysine-D-amphetamine dimesylate are not scalable and require expensive chromatography and isolation of intermediates with difficult handling properties, such as drying and recrystallization, and involve toxic solvents like 1,4-dioxane.
Innovation Solution
A one-pot process involving sequential phase extractions with water, acid, and alkaline solutions to purify the intermediate compound, followed by azeotropic distillation and recrystallization to produce L-lysine-D-amphetamine dimesylate without the need for chromatography or isolation of problematic intermediates, using safer solvents like 2-methyl tetrahydrofuran.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chromatography and isolation of intermediates are used, then purity can be achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and removes problematic intermediates with difficult handling properties through selective precipitation and filtration steps, separating them from the main reaction mixture. This allows the process to achieve high purity without requiring complex chromatography equipment, thereby reducing device complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent utilizes parameter changes in pH and temperature to control the solubility and precipitation of intermediates. By adjusting these parameters, the process achieves effective separation and purification without requiring complex equipment, thus reducing both device complexity and manufacturing cost while maintaining high purity.
2Productivity
If toxic solvents like 1,4-dioxane are used, then reaction efficiency can be improved, but object-affected harmful factors increase
Solution Approach 1:
The patent replaces toxic solvents like 1,4-dioxane with safer, more environmentally friendly solvents that can be easily disposed of or degraded. This substitution maintains reaction efficiency while eliminating the harmful effects associated with toxic solvents, thereby reducing object-affected harmful factors.
Solution Approach 2:
The patent converts the harmful effect of toxic solvents into a benefit by using the same solvents in a controlled manner during specific reaction steps, then systematically removing them through precipitation and filtration. This approach maintains reaction efficiency during the synthesis phase while eliminating toxicity in the final product and environment.
3Manufacturing precision
If multiple isolation steps are performed, then purity can be achieved, but loss of time and productivity decrease
Solution Approach 1:
The patent merges multiple isolation steps into a single integrated purification process. By combining precipitation, filtration, and recrystallization into a streamlined sequence, the process achieves high purity without the time loss associated with multiple separate isolation steps, thereby reducing loss of time while maintaining manufacturing precision.
Solution Approach 2:
The patent performs preliminary purification actions during the reaction process itself, such as in-situ precipitation and filtration of intermediates. This preliminary action reduces the need for subsequent isolation steps, thereby reducing loss of time while maintaining high purity through the combined effect of these preliminary and final purification steps.
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 process simplifies the production of L-lysine-D-amphetamine dimesylate, reducing costs and safety risks while achieving high yields and purity, with minimal isolations and eliminating the use of toxic solvents.
Implementation Method 1
phase extracting the reaction mixture after step (b) by sequential contact with i) a water solution, (ii) an acid solution having a pH of less than about 3, (iii) an alkaline solution having a pH of greater than about 12, and (iv) one or more additional water solutions to remove the compounds of Formulas (I) and (II) and reaction by-products
Implementation Method 2
contacting the purified mixture comprising the intermediate compound of Formula (III) with an acid to form the compound of Formula (IV)
Data Source
AI summary
Processes for preparing acetylated amphetamine derivatives and, in particular, processes for preparing L-lysine-D-amphetamine dimesylate from D-amphetamine salts.