Ionic Amino Acid Ester Synthesis via Autogenous Pressure
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Solution Overview
Problem
Conventional synthesis methods for amino acid esters are environmentally aggressive, use toxic reagents, require multiple steps with low yields, and are not scalable, while existing one-step methods using microwave irradiation still have limitations.
Innovation Solution
A synthesis process using a simple pressure reactor with a vent attachment for autogenous pressure reactions, allowing simultaneous esterification and protonation of amino groups to produce ionic amino acid esters with high yields and minimal waste, employing stoichiometric ratios of reagents and conventional heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional synthesis methods are used, then amino acid esters can be produced, but the process is environmentally aggressive and uses toxic reagents
Solution Approach 1:
The patent converts the harmful effect of strong acid catalysts into a beneficial one by using organic acids (p-toluenesulfonic acid or methanesulfonic acid) that provide sufficient catalytic activity while being less environmentally damaging. The acid catalyst is recovered and reused, transforming the waste problem into a resource recovery opportunity.
Solution Approach 2:
The patent implements recovery and reuse of the acid catalyst from the reaction mixture. The catalyst is separated from the product and reused in subsequent reactions, eliminating the need to discard it as waste and reducing overall environmental impact while maintaining manufacturing efficiency.
2Productivity
If conventional synthesis methods are used, then amino acid esters can be produced, but multiple steps are required with low yields
Solution Approach 1:
The patent merges the esterification reaction and protonation of the amino group into a single simultaneous reaction step. The carboxylic acid reacts with the alcohol to form the ester while also protonating the amino group to form the ionic amino acid ester in one pot, eliminating the need for separate protection and deprotection steps.
Solution Approach 2:
The patent segments the synthesis process into two main components that occur simultaneously: the esterification reaction and the protonation reaction. This allows the complex multi-step conventional process to be simplified into a single integrated operation with higher overall yield.
3Loss of time
If microwave irradiation is used for one-step synthesis, then reaction time is reduced, but equipment complexity and cost increase
Solution Approach 1:
The patent replaces the microwave irradiation system with a conventional heating system. The reaction is conducted in a simple pressure reactor using thermal heating instead of microwave energy, achieving comparable reaction times while eliminating the need for complex microwave equipment.
Solution Approach 2:
The patent uses a simple, inexpensive pressure reactor that can be easily replaced or disposed of after use, rather than investing in expensive, complex microwave equipment. The reactor serves its purpose efficiently and can be discarded or reused without significant cost.
4Productivity
If excess alcohol is used in microwave synthesis, then yield improves, but reagent waste increases
Solution Approach 1:
The patent changes the stoichiometric parameters by using equimolar amounts of alcohol and amino acid, or only a slight excess, rather than the large excess required in microwave methods. This parameter change maintains high yields while significantly reducing reagent waste.
Solution Approach 2:
The patent uses only the minimum necessary excess of alcohol (or equimolar amounts) to drive the reaction to completion, rather than using large excesses. This partial action is sufficient to achieve high yields while minimizing waste of the alcohol reagent.
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 achieves high yields (>80%) with reduced environmental impact, minimal waste, and easier scalability, making it more efficient and sustainable compared to conventional and microwave-based methods, while producing biodegradable and non-toxic compounds suitable for various industrial applications.
Implementation Method 1
a simple pressure reactor of glass or steel reactor with a vent attachment; which allows to carry out chemical reactions under autogenous pressure
Implementation Method 2
employing conventional heating
Data Source
AI summary
Embodiments of the present invention provide for efficient methods and processes for preparing ionic amino acid esters from a specific synthesis route. The disclosed embodiments consist of a single reaction step: reacting a natural or synthetic unprotected amino acid with an aliphatic, branched or aromatic fatty alcohol of even or odd number of carbon atoms from 6 to 20 with or without unsaturation(s), in stoichiometric amounts, in the presence of an organic acid (HX) like carboxylate, mesylate, tosylate or sulfonate, employed as catalyst and under conventional heating (CC) of 1 to 3 hours at a temperature in the range of approximately 60 to 150° C. and pressure the range of approximately 0 to approximately 250 psi; the product obtained is cooled and recrystallized from ethanol.