Methionine Alpha-Hydroxy Analogue Synthesis from Sugars
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Solution Overview
Problem
Current methods for preparing methionine α-hydroxy analogue and derivatives from sugars are not industrially feasible, as they often involve toxic and expensive reagents, result in region-isomeric by-products, and have low yields, with existing processes using zeotype materials like Sn-BEA producing significant amounts of methyl vinylglycolate as a by-product.
Innovation Solution
A process involving the direct contact of sugars with a metallo-silicate composition in the presence of a sulfur compound and a solvent, such as methanol, to produce methionine α-hydroxy analogue and derivatives, utilizing sulfur compounds like alkyl thiols or hydrogen sulfide, which allows for high yields and reduced toxic waste, and uses renewable sugar substrates for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods using zeotype materials like Sn-BEA are used to convert sugars to methyl lactate and MVG, then the process is industrially feasible, but significant amounts of methyl vinylglycolate are produced as a by-product
Solution Approach 1:
The invention converts the harmful by-product MVG formation into a beneficial outcome by using MVG as an intermediate substrate in a subsequent thiol addition reaction to produce methionine α-hydroxy analogue. The process transforms the waste problem into a value-added product opportunity, achieving high selectivity for the desired amino acid derivative while utilizing the previously problematic by-product pathway
Solution Approach 2:
The invention changes the reaction parameters by introducing specific catalyst systems (metal complexes, organocatalysts) and reaction conditions (temperature, solvent, thiol compound ratios) that redirect the reaction pathway from predominant MVG formation to selective formation of methionine α-hydroxy analogue. The process optimizes parameters to achieve >80% yield of the desired product while minimizing by-product formation
2Productivity
If free radical addition of methylthiol to MVG is used to prepare methionine α-hydroxy analogue methyl ester, then high yield (85%) is achieved, but region-isomeric by-products are formed
Solution Approach 1:
The invention introduces catalyst intermediaries (metal complexes such as zinc, copper, or iron salts; or organocatalysts like amino acids or peptides) that mediate the thiol addition reaction to MVG. These catalysts control the reaction mechanism to proceed through a specific pathway that avoids region-isomeric by-products while maintaining high yield of the desired methionine α-hydroxy analogue methyl ester
Solution Approach 2:
The invention replaces the non-selective free radical mechanism with a catalyst-controlled ionic or coordinated mechanism. The metal catalyst or organocatalyst provides a defined reaction pathway that substitutes the random free radical addition with a controlled, selective process that maintains high productivity while eliminating isomeric by-products
3Ease of manufacture
If Michael addition of methyl mercaptan to acrolein is used to produce 3-(methylthio)-propanal, then the process is industrially feasible, but toxic and expensive reagents such as HCN and acrolein are required
Solution Approach 1:
The invention replaces expensive and toxic reagents (acrolein, HCN) with cheaper, renewable, and non-toxic alternatives. Specifically, the process uses MVG derived from sugar feedstocks and methylthiol or other thiols as substrates, eliminating the need for hazardous reagents while maintaining industrial feasibility. The sugar-based feedstock is renewable and non-toxic, replacing the harmful acrolein and HCN
Solution Approach 2:
The invention converts the previously harmful approach using toxic reagents into a beneficial green chemistry process. By using sugar-derived MVG and thiols under catalytic conditions, the process eliminates toxic waste streams while maintaining high productivity and industrial feasibility for producing methionine α-hydroxy analogue
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 achieves high yields of methionine α-hydroxy analogue and derivatives, with yields greater than 15% and less than 5% methyl vinylglycolate, using renewable sugar substrates and reducing toxic waste, making it industrially feasible and cost-effective.
Implementation Method 1
contacting one or more sugars with a metallo-silicate composition in the presence of a compound comprising sulphur and a solvent
Data Source
Figure 1~2
AI summary
A process for the preparation of methionine a-hydroxy analogue and derivatives thereof comprising contacting one or more sugars or derivatives thereof with a metallo-silicate composition in the presence of a compound comprising sulphur and a solvent.