Apixaban Synthesis via Cycloaddition and Mild Conditions
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Solution Overview
Problem
Current methods for preparing apixaban and its intermediates are complex, expensive, and hazardous, with severe reaction conditions making industrial scalability challenging, particularly due to the use of reagents like phosphorus pentachloride and high temperatures.
Innovation Solution
A cycloaddition reaction between a novel compound of formula (III) and a compound of formula (IV) using safe, inexpensive reagents at low temperatures, resulting in high yields and regioselectivity, with the formation of a stable, easily filterable, and commercially viable crystalline form of apixaban known as Form α, which is a sesquihydrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus pentachloride and high temperatures are used in the preparation of intermediate (C), then the reaction proceeds successfully, but the process becomes hazardous, expensive, and difficult to scale industrially
Solution Approach 1:
The patent changes the reaction parameters by using phosphorus trichloride at lower temperatures instead of phosphorus pentachloride at high temperatures. This parameter substitution maintains reaction effectiveness while eliminating the hazardous and expensive conditions associated with the prior art method
Solution Approach 2:
The patent replaces expensive phosphorus pentachloride with cheaper phosphorus trichloride. The simpler reagent achieves the same synthetic goal without requiring the complex handling and expensive infrastructure needed for phosphorus pentachloride, making the process more economically viable for industrial scale-up
2Reliability
If morpholine is used as solvent at high temperatures for the preparation of intermediate (C), then the reaction succeeds, but the process complexity and cost increase
Solution Approach 1:
The patent changes the solvent parameter from morpholine to a simpler solvent system, and reduces the temperature from reflux conditions to lower temperatures. This simplifies the equipment requirements and operational complexity while maintaining reaction success
Solution Approach 2:
The patent replaces expensive morpholine solvent with cheaper, more readily available solvents that do not require special handling or expensive equipment, thereby reducing overall process complexity and cost
3Reliability
If complex synthesis routes are used for intermediate (C), then the desired product can be obtained, but the manufacturing cost and time increase
Solution Approach 1:
The patent segments the synthesis by using a direct, single-step reaction from phosphorus trichloride to intermediate (C), avoiding the multi-step complex routes required by prior art. This segmentation into simpler, more direct steps improves manufacturing efficiency and reduces time costs
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 allows for the efficient and cost-effective production of apixaban with high yields and chemical purity, facilitating industrial scalability and safety by using mild reaction conditions and inexpensive reagents, while the novel crystalline form α is stable and easily handled, making it suitable for commercial forms of apixaban.
Implementation Method 1
a cycloaddition reaction between a compound of formula (III) and a compound of formula (IV)
Implementation Method 2
apixaban of formula (I) can exist in a hydrated crystalline form, here called Form α
Data Source
AI summary
Process for the preparation of apixaban and intermediates useful for the preparation thereof.