High-Purity Quinoline Derivative Production via Hydrous Solvent Precipitation
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Solution Overview
Problem
Existing methods for producing quinoline derivatives result in products with significant impurities, making it difficult to achieve high purity and high yield, particularly due to the presence of compounds like (I), (A-1), and (C-1), which are challenging to remove using common purification techniques such as chromatography and crystallization.
Innovation Solution
A novel production method involving specific reaction steps and the use of a hydrous organic solvent to precipitate and isolate the quinoline derivative, reducing the content of impurities (I), (A-1), and (C-1) to achieve a highly pure compound (IV) with a yield of 98.0% or more, including steps where compound (I) is reacted with compound (II) and then with cyclopropylamine without isolation, followed by conversion to a salt like methanesulfonate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If common purification methods such as chromatography and crystallization are used, then the quinoline derivative can be purified, but the impurities (I), (A-1), and (C-1) cannot be effectively removed
Solution Approach 1:
The patent changes the physical and chemical parameters of the purification process by using a specific solvent system (mixture of water and organic solvent) at controlled temperatures. This parameter change enables the selective precipitation of impurities (I), (A-1), and (C-1) that cannot be removed by conventional purification methods, achieving over 99.5% purity without requiring complex chromatography procedures.
2Productivity
If multiple reaction steps are used to produce the quinoline derivative, then the synthesis can be completed, but the total yield is low (25.5% in PTL 1)
Solution Approach 1:
The patent merges multiple reaction steps into a one-pot synthesis procedure. By combining the formation of the quinoline ring, substitution reactions, and purification steps into a single continuous process using a specific catalyst system and solvent mixture, the total yield increases from 25.5% across multiple steps to over 98% in a single operation, eliminating intermediate isolation and purification steps.
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the reaction conditions including catalyst selection, solvent composition, temperature profile, and reagent addition sequence before initiating the main reaction. This preliminary optimization ensures that all subsequent reactions proceed efficiently in one pot, maximizing overall yield and eliminating the need for multiple separate reaction steps.
3Reliability
If the quinoline derivative is produced by existing methods, then the compound can be obtained, but significant impurities remain that meet pharmaceutical standards
Solution Approach 1:
The patent introduces a specific solvent system (mixture of water and organic solvent such as acetone, ethanol, or isopropyl alcohol) as an intermediary medium that facilitates selective precipitation of impurities (I), (A-1), and (C-1). This intermediary solvent system enables the separation of trace impurities at concentrations below 0.05%, meeting pharmaceutical purity standards without requiring additional complex purification steps.
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 method effectively reduces impurity content to 350 ppm or less, achieving a high-yield and high-purity quinoline derivative, meeting the requirements for pharmaceutical applications and compliance with toxicological and genotoxicity standards.
Implementation Method 1
a step of allowing a compound represented by formula (I) or a salt thereof to react with a compound represented by formula (II-A) or formula (II-B) by introducing a hydrous organic solvent to a reaction solution
Data Source
AI summary
Provided is a compound represented by formula (IV) or a salt thereof, wherein the content of the compound represented by formula (A-1) is 60 ppm by mass or less.