Dimeric Macrocycle Synthesis Yield Optimization
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Solution Overview
Problem
The existing process for manufacturing the dimeric gadolinium complex, as disclosed in WO 2017/098044, has drawbacks such as long reaction times, low overall yields, and the need for isolating intermediates, making it unsuitable for industrial-scale production.
Innovation Solution
A process that avoids isolating intermediates by directly reacting glucamine with epichlorohydrin, followed by removing residual epichlorohydrin and its derivatives, and then coupling with Compound 1A to produce the intermediate dimeric macrocycle, thereby improving yields and reducing reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the process isolates intermediates (Compound 2 and Compound 3), then the manufacturing precision is improved, but the device complexity and loss of time increase
Solution Approach 1:
The patent combines multiple steps into a one-pot synthesis where Compound 2 is formed and directly reacted with Compound 1A without isolation. The reaction mixture is treated as a single integrated system, eliminating the need for separate isolation steps while maintaining product purity through controlled reaction conditions and in-situ purification.
Solution Approach 2:
The patent performs preliminary removal of residual epichlorohydrin and derivatives through extraction or distillation before the coupling reaction with Compound 1A. This preliminary action prevents unwanted side reactions and improves the efficiency of the subsequent coupling step without requiring isolation of the intermediate Compound 2.
2Manufacturing precision
If the process uses long reaction times to ensure complete reaction, then the manufacturing precision is improved, but the productivity deteriorates
Solution Approach 1:
The patent optimizes reaction parameters including temperature, concentration, and catalyst selection to accelerate the coupling reaction between Compound 2 and Compound 1A. By adjusting these parameters, the reaction achieves complete conversion in shorter times while maintaining high manufacturing precision, thus improving productivity without sacrificing reaction completeness.
3Productivity
If the process uses high yield reactions, then the productivity is improved, but the object-generated harmful factors increase
Solution Approach 1:
The patent extracts or removes residual epichlorohydrin and its derivatives from the reaction mixture through extraction with organic solvents or distillation before the coupling reaction. This removal step reduces the harmful factors while maintaining high reaction yield, as the extraction does not interfere with the subsequent coupling between Compound 2 and Compound 1A.
Solution Approach 2:
The patent converts the potentially harmful residual epichlorohydrin into a beneficial step by using its removal as a purification mechanism that improves the quality of the reaction mixture. The extraction or distillation step, while adding process complexity, ensures higher product purity and reduces harmful effects, justifying the additional step for clinical applications.
4Object-affected harmful factors
If the process removes residual epichlorohydrin, then the object-affected harmful factors are reduced, but the device complexity increases
Solution Approach 1:
The patent performs the removal of residual epichlorohydrin as a preliminary action before the coupling reaction with Compound 1A. This preliminary extraction or distillation step reduces harmful factors and improves reaction efficiency, and is integrated into the overall process flow without requiring complex additional equipment or extensive process modifications.
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 achieves higher yields and shorter reaction times, making it more suitable for industrial-scale production, while also reducing the presence of harmful by-products like epichlorohydrin, which is classified as a probable or likely carcinogen.
Implementation Method 1
removing at least part of residual epichlorohydrin and derivatives thereof
Implementation Method 2
removing at least part of residual epichlorohydrin and derivatives thereof
Implementation Method 3
coupling with Compound 1A to produce the intermediate dimeric macrocycle
Data Source
AI summary
The present invention relates to a process for the manufacturing of a mixture comprising the intermediate 1-[bis[2-hydroxy-3-[4,7,10-tris[2-(1,1-dimethylethoxy)-2-oxoethyl]-1,4,7,10-tetraazacyclododec-1-yl]propyl]amino]-1-deoxy-D-glucitol. Such intermediate is useful for the synthesis of the dimeric gadolinium complex [μ-[1-[bis[2-(hydroxy-κO)-3-[4,7,10-tris[(carboxy-κO)methyl]-1,4,7,10-tetraazacyclododec-1-yl-κN1,κN4,κN7,κN10]propyl]amino]-1-deoxy-D-glucitolate(6-)]]digadolinium complex, which can be employed as a contrast agent in the field of diagnostic imaging, and in particular of Magnetic Resonance Imaging (MRI).