Amino Acid Synthesis via 2ABL N-Carboxylation
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Solution Overview
Problem
Current methods for synthesizing methionine from 2-aminobutyrolactone (2ABL) face low yields and require multi-step processes with burdensome purification steps, especially when using homoserine as a precursor, making large-scale synthesis inefficient.
Innovation Solution
A method involving N-carboxylation of 2-ABL with CO2 followed by reaction with a nucleophilic reagent and acidification, which allows for the reversible protection and deprotection of the amine function, enabling higher yields and simplifying the synthesis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the standard conversion of 2ABL into methionine using sodium methanethiolate is used, then the synthesis is achieved in a single step, but the yield is only 44%
Solution Approach 1:
The patent applies preliminary action by introducing a protecting group on the amine function of 2ABL before the nucleophilic attack, and removing it afterward. This preliminary modification enables the reaction to proceed with higher yield (4-fold increase) while maintaining a relatively simple two-step process structure, thus resolving the contradiction between yield improvement and process complexity.
2Productivity
If the method using homoserine as precursor is used, then higher yields are obtained, but three steps with purification of intermediates are required
Solution Approach 1:
The patent extracts the essential function of the homoserine pathway (forming the N-carboxyl group) while eliminating the need for the intermediate N-acetamide step and associated purification operations. By using 2ABL directly with a protecting group, the method achieves high yield without requiring three steps and intermediate purification, thus resolving the contradiction between yield and process complexity.
Solution Approach 2:
The patent uses a protecting group as an intermediary that temporarily modifies the amine function of 2ABL, enabling the nucleophilic attack to proceed with high yield. This intermediary is easily introduced and removed, avoiding the need for complex multi-step synthesis and purification procedures required by the homoserine pathway, thus resolving the contradiction between yield improvement and process simplification.
3Productivity
If the cyclization of homoserine into 2ABL is used, then the synthesis is efficient, but the yield of the ultimate methionine conversion step is too low
Solution Approach 1:
The patent applies preliminary action by introducing a protecting group on the amine function of 2ABL before the nucleophilic attack, and removing it afterward. This preliminary modification enables the reaction to proceed with higher yield (4-fold increase) while maintaining a relatively simple two-step process structure, thus resolving the contradiction between yield improvement and process complexity.
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 method results in a four-fold increase in methionine yield and allows for the efficient industrial synthesis of various amino acids, including methionine, homocysteine, and selenomethionine, with improved process efficiency and scalability.
Implementation Method 1
N-carboxylation of 2-aminobutyrolactone (2ABL) is achieved with carbon dioxide
Implementation Method 2
The N-carboxyl of the thereby obtained 2ABL is reacted with a reagent XH or its salts
Implementation Method 3
capable of acting on the beta carbon of the protected amine function, in order to open the lactone ring
Data Source
AI summary
The invention relates to a method for preparing an amino acid, or its salts, from 2-aminobutyrolactone (2ABL), said amino acid fitting the formula I, XCH2CH2CHNH2COOH, wherein X is such that X− represents a nucleophilic ion, according to which N-carboxylation of 2-aminobutyrolactone (2ABL) is achieved with carbon dioxide, and the thereby obtained 2ABL carbamate is reactive with an XH reagent or its salts.