Aqueous Lactam Ring-Opening for Amino Acid Ester Synthesis
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Solution Overview
Problem
Current methods for synthesizing organosulfate salts of amino acid esters require handling of organic solvents and corrosive acids, are complex, and have low yields with long reaction times, and struggle with reacting amino acids and lactams with low water solubility alcohols.
Innovation Solution
A process involving the reaction of lactams with sulfuric acid in an aqueous solution, followed by esterification with excess alcohol in water, allowing for the synthesis of organosulfate salts of amino acid esters without organic solvents and corrosive acids, using a single reaction step with high yield and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods are used for synthesizing organosulfate salts of amino acid esters, then the synthesis can be performed with existing processes, but handling of organic solvents and corrosive acids is required, and yields are low with long reaction times
Solution Approach 1:
The invention changes the reaction medium from organic solvents to water as the solvent system, and modifies the acid form from corrosive concentrated acids to milder acid forms, thereby eliminating harmful handling while maintaining reaction efficiency and improving productivity
Solution Approach 2:
The invention uses water as a disposable, non-toxic solvent that can be easily removed, replacing expensive and hazardous organic solvents that require special handling and disposal procedures
2Ease of manufacture
If current methods are used for synthesizing organosulfate salts of amino acid esters, then existing synthesis routes can be followed, but the processes are complex with multiple steps
Solution Approach 1:
The invention combines multiple separate synthesis steps into a single one-pot reaction where amino acid ester and organosulfate are formed simultaneously in water, eliminating the need for separate organic solvent steps and simplifying the overall manufacturing process
3Manufacturing precision
If current methods are used for synthesizing organosulfate salts of amino acid esters, then traditional esterification can be performed, but yields are low
Solution Approach 1:
The invention changes the esterification conditions by performing the reaction in water with specific pH control and temperature parameters, which dramatically improves the yield of organosulfate salt formation while reducing the time required to reach completion
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 yield and fast reaction times, eliminating the need for organic solvents and corrosive acids, and effectively synthesizes organosulfate salts of amino acid esters, suitable for detergent formulations.
Implementation Method 1
the ring -opening of the lactam to obtain the amino acid in presence of an acid
Implementation Method 2
as a second step the esterification reaction with an alcohol
Implementation Method 3
TRIVEDI, T. J. et al. ChemSusChem 2011, number 4, pages 604-608 describe a synthesis route to salts from alpha- C 3 -C 4 -amino acid esters and laurylsulfate
Data Source
AI summary
The present invention relates to a process for the synthesis of organosulfate salts of amino acid esters comprising the steps of reacting at least one lactam with at least 3 carbon atoms in the lactam ring with sulfuric acidin an aqueous solution followed by esterification of the reaction product of the previous step with at least 200 mol-% of at least one alcohol selected from the group consisting of linear alkyl alcohol containing one hydroxy group, branched alkyl alcohol containing one hydroxy group, linear alkylether alcohol containing one hydroxy group, branched alkylether alcohol containing one hydroxy group, phenoxyalkanols containing one hydroxy group, and mixtures thereof; followed optionally removal of water and/or removal of excess alcohol.