One-Pot Synthesis of Ioversol Intermediates
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Solution Overview
Problem
Current processes for synthesizing iodinated contrast products, such as ioversol, are inefficient due to lengthy separation and purification steps, energy consumption, and environmental concerns related to excess reagents and byproducts, leading to high costs and safety risks.
Innovation Solution
A one-pot process involving acylation, chlorination, amidation, and deprotection of 2,4,6-triiodo-5-aminoisophthalic acid without intermediate isolation, using dimethylacetamide and propylene carbonate as solvents, which reduces the need for purification and separation steps, thereby enhancing yield and safety while minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional multi-step synthesis processes with intermediate isolation are used, then purification quality is improved, but synthesis time and process complexity increase significantly
Solution Approach 1:
The patent combines multiple synthesis steps (acylation, chlorination, amidation, deprotection) into a single sequential process without isolating intermediates. The reaction mixture proceeds directly from one transformation to the next, eliminating the time-consuming isolation and purification steps between operations while maintaining product purity through controlled reaction conditions and in-process monitoring.
Solution Approach 2:
The synthesis process maintains continuous useful action by performing transformations sequentially without breaking the reaction flow. The output of one step becomes the input for the next step within the same reaction vessel, ensuring uninterrupted progression through the synthesis pathway and eliminating idle time associated with intermediate handling.
2Speed
If excess chlorinating agent is used to improve reaction kinetics, then chlorination speed is improved, but environmental harm and safety risks increase
Solution Approach 1:
The patent changes the reaction parameters by conducting chlorination at lower temperatures (0-25°C instead of >48°C) and using controlled equivalents of chlorinating agent (1.05-1.2 equivalents instead of large excess). This achieves acceptable reaction speeds while dramatically reducing the generation of harmful byproducts like HCl and SO2, and eliminating the need for excessive reagent addition.
Solution Approach 2:
The patent converts the potentially harmful excess chlorinating agent into a beneficial controlled reagent by using precise stoichiometric control. The small excess (1.05-1.2 equivalents) ensures complete reaction while minimizing waste, transforming what would normally be an environmental hazard into a controlled process parameter that maintains efficiency without compromising safety or environmental performance.
3Reliability
If large quantities of water are used for hydrolysis, then chlorination completeness is improved, but effluent volume and processing complexity increase
Solution Approach 1:
The patent changes the hydrolysis parameters by using minimal water quantities (1-5 equivalents instead of 22-120 equivalents) and conducting the reaction under controlled conditions. This maintains complete hydrolysis of the chlorinating agent while dramatically reducing the volume of effluent requiring treatment, thereby simplifying the overall process and reducing environmental impact.
4Manufacturing precision
If multiple isolation and purification steps are performed, then product purity is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges multiple isolation and purification operations into a single integrated process. By performing acylation, chlorination, amidation, and deprotection sequentially without isolating intermediates, the process eliminates the need for multiple filtration, centrifugation, and drying steps, thereby reducing process complexity while maintaining product purity through controlled reaction conditions.
Solution Approach 2:
The patent extracts the unnecessary isolation and purification steps from the synthesis process. By designing the sequence to proceed directly from one transformation to the next without intermediate separation, the process removes the complex equipment and operations associated with multiple purification stages, simplifying the overall manufacturing process.
5Speed
If high temperature chlorination is used to improve reaction rate, then chlorination speed is improved, but energy consumption increases
Solution Approach 1:
The patent changes the temperature parameter from high temperature (>48°C) to low temperature (0-25°C) while maintaining acceptable chlorination speeds through optimized reagent selection and stoichiometric control. This parameter change dramatically reduces energy consumption for heating and cooling operations, making the process more energy-efficient without sacrificing production speed.
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 significantly reduces synthesis time and costs, improves yield to at least 80%, and minimizes environmental impact by eliminating the need for excess reagents and hazardous byproducts, making it more economical and environmentally friendly.
Implementation Method 1
acylation of 2,4,6-triiodo-5-aminoisophthalic acid of the following formula (A) to obtain an intermediate compound Ya
Implementation Method 2
chlorination of the intermediate compound Ya to obtain an organo-iodine intermediate compound Yb
Implementation Method 3
amidation of the organo-iodine intermediate compound Yb, in the presence of an inorganic base, to obtain an intermediate compound Yc
Implementation Method 4
deprotection of the intermediate compound Yc
Data Source
AI summary
The invention relates to a process for the preparation of organo-iodinated compounds as well as the preparation intermediates thereof. More specifically, the invention relates to a process for the preparation of organo-iodinated compounds useful as preparation intermediates in the synthesis of the contrast product ioversol.