Purifying 2-phenyl-4-(3-carboalkoxypropionyl)-1,3-oxazolin-5-one
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Solution Overview
Problem
The existing methods for producing 2-phenyl-4-(3-carboalkoxypropionyl)-1,3-oxazolin-5-one result in red-colored crystals with low purity due to impurities that cannot be effectively removed using conventional washing processes.
Innovation Solution
Suspension of red-colored crystals in a moist organic solvent with specific polarity and water content until decolorization occurs, allowing for the removal of impurities and conversion to a higher purity crystalline form, specifically using solvents with an elution power E0 range of 0.40 to 0.55 and 1-10% water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional washing processes are used to purify 2-phenyl-4-(3-carboalkoxypropionyl)-1,3-oxazolin-5-one, then the product can be obtained, but the purity remains low due to persistent red-colored impurities
Solution Approach 1:
The patent applies parameter changes by modifying the solvent system from conventional washing solvents to a specific moist organic solvent with controlled water content (1-10 vol%). This parameter change in solvent composition enables the removal of red-colored impurities that conventional washing cannot eliminate, achieving >95% HPLC purity while maintaining process simplicity
Solution Approach 2:
The patent uses a moist organic solvent as an intermediary substance that facilitates the removal of impurities. The specific solvent system (with elution power E0 = 0.40-0.55 and controlled water content) acts as a mediator between the crude product and pure product, enabling selective dissolution of impurities while preserving the desired compound
2Productivity
If the red-colored crystalline material is used directly for producing 5-aminolevulinic acid hydrochloride, then the production can proceed, but the low purity affects the quality of the final product
Solution Approach 1:
The patent applies preliminary action by performing a specific suspension treatment before the main production step. The red-colored crystals are suspended in moist organic solvent to remove impurities and convert to colorless crystalline form B, ensuring high purity starting material for subsequent 5-aminolevulinic acid hydrochloride production, thereby guaranteeing final product quality
3Manufacturing precision
If known crystalline form A is converted during suspension, then a new crystalline form B is obtained with better properties, but the conversion process requires specific solvent conditions
Solution Approach 1:
The patent achieves crystalline form conversion through parameter changes in the solvent system. By using moist organic solvent with specific elution power (E0 = 0.40-0.55) and controlled water content (1-10 vol%), the process transforms crystalline form A to form B, achieving >95% purity without complex equipment or multiple processing 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 process achieves a purity of >95% HPLC area% for 2-phenyl-4-(3-carboalkoxypropionyl)-1,3-oxazolin-5-one, converting the red-colored form to a colorless, more suitable form for producing 5-aminolevulinic acid hydrochloride, with the new crystalline form B exhibiting a distinct XRPD pattern.
Implementation Method 1
suspending the respective red-colored crystals for a sufficiently long time in a moist organic solvent of suitable polarity
Implementation Method 2
the red-colored crystals are suspended in an organic solvent or a mixture of several organic solvents until decolorization
Data Source
AI summary
A process for purifying 2-phenyl-4-(3-carboalkoxypropionyl)-1,3-oxazolin-5-one, formed by reacting N-benzoylglycine with succinic monoalkyl ester chloride in 4-methylpyridine and obtainable in the form of red-colored crystals after neutralization with an excess of hydrochloric acid, characterized in that the red-colored crystals are suspended in an organic solvent or a mixture of several organic solvents until decolorization, wherein the organic solvent(s) are selected from the group consisting of organic solvents with an elution power E0 in the range of 0.40 to 0.55, and wherein the organic solvent(s) have a water content in the range of 1 to 10 vol.%.