Molnupiravir Synthesis Process Yield and Purity Optimization
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Solution Overview
Problem
Existing processes for preparing Molnupiravir are associated with low yield and low purity, requiring multiple steps and techniques such as silica gel column chromatography for purification.
Innovation Solution
A process involving reacting Cytidine with 2,2-dimethoxypropane, followed by isobutyric anhydride, hydroxylamine sulfate, and subsequent deprotection with trifluoroacetic or hydrochloric acid in specific organic solvents and temperatures to obtain Molnupiravir with high yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing processes for preparing Molnupiravir are used, then the preparation can be achieved, but the yield and purity are low
Solution Approach 1:
The patent modifies reaction parameters including temperature, solvent selection, and reagent stoichiometry to optimize both yield and purity. Specifically, it uses controlled temperature conditions (0-5°C for acetylation, reflux for hydroxylamine reaction) and selects specific solvents (acetonitrile, ethyl acetate, isopropyl alcohol) to achieve ≥99.5% purity and higher yields simultaneously
Solution Approach 2:
The patent extracts and removes impurities through selective purification steps including filtration, washing with specific solvents, and chromatography, separating the desired Molnupiravir product from reaction byproducts and starting materials to achieve high purity while maintaining yield
2Manufacturing precision
If multiple purification steps such as silica gel column chromatography are used, then purity can be improved, but the process complexity and time increase
Solution Approach 1:
The patent segments the purification process into distinct functional steps: initial filtration to remove solids, solvent washing to remove soluble impurities, and chromatography for final purification. This segmentation allows each step to be optimized independently, reducing overall complexity while maintaining high purity
Solution Approach 2:
The patent uses intermediate purification agents and media such as specific solvents (acetonitrile, ethyl acetate, isopropyl alcohol) and chromatography media that act as intermediaries to selectively remove impurities without requiring complex multi-step procedures, simplifying the overall process
3Manufacturing precision
If existing multi-step synthesis processes are used, then Molnupiravir can be prepared, but the number of steps and production time increase
Solution Approach 1:
The patent implements continuous processing where reaction steps are performed sequentially without interruption, and purification steps are integrated into the workflow. The process maintains continuous monitoring and adjustment of conditions to minimize idle time while ensuring high purity product
Solution Approach 2:
The patent performs preliminary actions such as pre-cooling reagents, pre-filtering solids, and pre-preparing purification columns before the main synthesis steps, reducing the time required during critical reaction phases and accelerating overall production
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 ≥99.5% purity and higher yields, simplifying the purification steps and improving the overall efficiency of Molnupiravir production.
Implementation Method 1
reacting Cytidine (II) with 2,2-dimethoxypropane and H2SO4 in presence of an organic solvent to obtain compound (III), 2′,3′-O-(1-methylethylidene)-sulfate Cytidine
Implementation Method 2
reacting compound (III) with isobutyric anhydride in presence of an organic base and an organic solvent at a temperature of 0-5° C. for 60 min, to obtain compound (IV)
Implementation Method 3
reacting compound (IV) with hydroxylamine sulfate in presence of an organic solvent to obtain compound (V), 2′,3′-O-(1-methylethylidene)-4-oxime-5′-(2-methyl propanoate) Uridine
Implementation Method 4
deprotecting compound (V) with trifluoroacetic acid or hydrochloric acid in presence of an organic solvent and water, at a temperature of 50-55° C. for about 2-3 hours, to obtain Molnupiravir (I)
Data Source
AI summary
The present invention relates to a process for the preparation of Molnupiravir. The present invention also relates to an improved and commercially viable process for preparation of Molnupiravir with high yield and purity.