Ivacaftor Preparation via Direct Condensation
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Solution Overview
Problem
The existing processes for preparing ivacaftor often result in unwanted by-products and unreacted coupling agents, requiring extensive purification and being not amenable to large-scale production due to the use of expensive coupling agents.
Innovation Solution
A process involving novel intermediates where compounds of specific formulas are reacted and optionally deprotected to obtain ivacaftor, avoiding the use of expensive coupling agents and improving yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional coupling agents (HATU, HBTU, T3P) are used for amide bond formation, then the reaction proceeds efficiently, but expensive coupling agents and unreacted residues remain as contaminants requiring extensive purification
Solution Approach 1:
The patent removes the harmful coupling agent component from the reaction system entirely. Instead of using conventional coupling agents like HATU or HBTU, the invention employs direct condensation of carboxylic acid with amine in the presence of a base (triethylamine or diisopropylethylamine), eliminating the source of contaminating residues that require extensive purification.
Solution Approach 2:
The patent replaces expensive coupling agents with inexpensive, readily available reagents (carboxylic acid, amine, and base). This substitution uses cheap, easily removable components that can be efficiently washed away with common solvents like dilute HCl and water, eliminating the need for costly purification steps.
2Manufacturing precision
If extensive purification steps are performed to remove coupling agent residues, then product purity is improved, but production time and complexity increase
Solution Approach 1:
The patent extracts the purification complexity from the process by preventing contaminant formation in the first place. The simplified workup involves only basic extraction steps with dilute acid and water, eliminating complex chromatography or multiple purification steps that would increase process complexity and time.
Solution Approach 2:
The reaction system is designed to be self-purifying to a large extent. The byproducts of the condensation reaction (water and soluble salts) are easily separated from the product through simple extraction and filtration, allowing the product to effectively purify itself without requiring complex external purification apparatus or procedures.
3Reliability
If conventional amide coupling methods are used, then the reaction is well-established, but the process is not amenable to large-scale production due to cost and purification requirements
Solution Approach 1:
The patent employs inexpensive, readily available reagents (carboxylic acid, amine, and common base) that can be easily handled and scaled. The elimination of expensive coupling agents and complex purification requirements makes the process economically viable for large-scale manufacturing while maintaining reaction reliability through well-established chemistry.
Solution Approach 2:
The patent changes the reaction parameters from conventional coupling conditions (requiring expensive reagents and controlled purification) to a simpler condensation protocol using abundant reagents. This parameter change includes using readily available bases like triethylamine instead of specialized coupling agents, enabling easy scaling to industrial production while maintaining product quality.
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 purity and yield of ivacaftor, making it suitable for large-scale production while minimizing the need for expensive coupling agents and reducing purification efforts.
Implementation Method 1
reacting a compound of Formula III with a compound of Formula IV or a salt thereof to obtain a compound of Formula V
Implementation Method 2
optionally deprotecting the compound of Formula V to obtain ivacaftor of Formula I
Data Source
AI summary
The present invention provides processes for the preparation of ivacaftor using novel intermediates and a process for its preparation.