Rocuronium Synthesis via Solvent-Free Quaternization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preparing rocuronium bromide require large amounts of solvent and 3-bromopropene, result in long reaction times, and produce impurities due to poor thermal stability, making them inefficient and costly for industrial production, with 3-bromopropene posing genotoxic risks.
Innovation Solution
The method involves reacting 2β-(4-morpholinyl)-16β-(1-pyrolidinyl)-5α-androstan-3α-ol-17β-acetate with 3-bromopropene in the absence of additional solvents, using 3-bromopropene as both a solvent and reactant, followed by precipitation and subsequent crystallization with a good solvent and anti-solvent to minimize reaction time and solvent use, achieving rapid and complete reaction with reduced impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large amount of solvent and 3-bromopropene are used in quaternization reaction, then the reaction can proceed, but the reaction time becomes long and the aftertreatment becomes cumbersome
Solution Approach 1:
The invention changes the reaction parameters by using a different base (cesium carbonate or potassium carbonate) and solvent system (acetonitrile), which alters the reaction kinetics and allows for reduced amounts of reactants while maintaining high conversion rates and shortening reaction time to 3-6 hours.
Solution Approach 2:
The invention adopts a proven reaction system from literature (US 7642246) as a baseline and optimizes it by adjusting the base type and solvent composition, thereby replicating the successful reaction pathway while improving efficiency through parameter optimization.
2Productivity
If large amount of 3-bromopropene is applied, then the reaction can proceed completely, but the residue of 3-bromopropene in final product increases
Solution Approach 1:
By changing the base to cesium carbonate or potassium carbonate and using acetonitrile as solvent, the invention achieves complete reaction with reduced 3-bromopropene requirements, controlling residue below 10 ppm while maintaining high conversion rates.
Solution Approach 2:
The invention implements process monitoring and optimization based on reaction progress feedback, adjusting reaction conditions to achieve complete conversion with minimal excess reagent, thereby minimizing harmful residues in the final product.
3Productivity
If heating under reflux is applied to accelerate reaction, then reaction time is reduced, but rocuronium bromide decomposes due to poor thermal stability
Solution Approach 1:
The invention changes the reaction parameters by using a different base and solvent system that enables the reaction to proceed at lower temperatures without reflux, thereby maintaining product stability while achieving acceptable reaction rates within 3-6 hours.
4Manufacturing precision
If column chromatography is used for separation, then product purity is achieved, but the process becomes complex and not conducive to industrial production
Solution Approach 1:
The invention extracts and eliminates the need for complex column chromatography separation by optimizing the reaction conditions to produce high purity product directly, using simple filtration and solvent removal steps instead, thereby simplifying the process for industrial scalability.
5Ease of manufacture
If two-phase reaction with solid powder of sodium carbonate is used, then the reaction can proceed, but the reaction time becomes long and conversion ratio is low
Solution Approach 1:
The invention changes the physical state parameters by using soluble bases (cesium carbonate or potassium carbonate) in acetonitrile solvent, creating a homogeneous single-phase reaction system that achieves complete conversion within 3-6 hours, unlike the slow two-phase reaction with solid sodium carbonate.
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 approach significantly reduces the amount of 3-bromopropene residue, shortens reaction time, and enhances purity and yield of rocuronium bromide, facilitating industrial production with HPLC purity up to 99% and 3-bromopropene content below 10 ppm, making the process more efficient and cost-effective.
Implementation Method 1
2β-(4-morpholinyl)-16β-(1-pyrrolidinyl)-5α-androstan-3α-ol-17β-acetate is reacted with 3-bromopropene to give rocuronium bromide
Implementation Method 2
the product rocuronium bromide is insoluble in 3-bromopropene, it is precipitated once formed
Implementation Method 3
the residue is recrystallized from acetone to give the target product
Data Source
Figure 1
AI summary
A method for preparing rocuronium is disclosed. 2β-(4-Morpholinyl)-16β-(1-pyrrolidinyl)-5α-androstan-3α-ol-17β-acetate is used as a starting material and is directly reacted with 3-bromopropene at ambient temperature to produce rocuronium.