2-Amino-N-(2,2,2-Trifluoroethyl)acetamide Synthesis via CDI Coupling
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Solution Overview
Problem
Current methods for preparing 2-amino-N-(2,2,2-trifluoroethyl)acetamide and its salts are inefficient, lacking a reliable and scalable process for producing high yields with optimal conditions.
Innovation Solution
A method involving the contact of a compound of Formula 8 with a compound of Formula 3 and a coupling reagent, N,N'-carbonyldiimidazole, in the presence of a base and a water immiscible solvent, followed by reaction with an acid to form the desired salt, optimizing conditions such as temperature and solvent choice to enhance yield and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to prepare 2-amino-N-(2,2,2-trifluoroethyl)acetamide, then the process can be performed with simple equipment, but the yield is low and the process is inefficient
Solution Approach 1:
The patent optimizes reaction parameters including using N,N'-carbonyldiimidazole as a coupling reagent, selecting specific bases (triethylamine, N,N-diisopropylethylamine), and controlling reaction temperatures (15-40°C for amide formation, 20-45°C for salt formation) to significantly improve the yield and efficiency of preparing 2-amino-N-(2,2,2-trifluoroethyl)acetamide and its salts
Solution Approach 2:
The patent introduces N,N'-carbonyldiimidazole as an intermediary coupling reagent that activates the carboxylic acid to facilitate amide bond formation, and uses water-immiscible solvents (ethyl acetate, iso-propyl acetate) as intermediaries to enable efficient phase separation and product isolation, thereby improving overall process efficiency and yield
2Adaptability or versatility
If the free amine form is produced, then it is versatile for further reactions, but it has poor stability and is difficult to handle and store
Solution Approach 1:
The patent performs preliminary action by directly forming stable acid salts (hydrochloride, bromide, trifluoroacetate, methanesulfonate, sulfate, or phosphate) during the synthesis process rather than isolating the unstable free amine. This preliminary salt formation preserves the compound's versatility while simultaneously ensuring stability and ease of handling and storage
Solution Approach 2:
The patent converts the potential harm of the free amine's instability and handling difficulties into a benefit by deliberately forming stable acid salts. The salt formation, which might be seen as an additional step, actually solves the stability and handling problems while maintaining the compound's reactivity for further reactions
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 provides a scalable and efficient route to 2-amino-N-(2,2,2-trifluoroethyl)acetamide and its salts, improving yield and stability, and allowing for easier handling and storage due to the formation of stable acid salts.
Implementation Method 1
contacting a compound of Formula 8 with a compound of Formula 3 and a coupling reagent in the presence of a base and optionally also in the presence of a water immiscible solvent, to form an intermediate of Formula 7 wherein the coupling agent is N,N'-carbonyldiimidazole
Data Source
AI summary
Disclosed are methods for preparing compounds of Formula 1 and 1A. One method utilizes a tert-butyl carbamate amine protecting group and an intermediate of Formula 7. Another method utilizes a benzyl carbamate amine protecting group and an intermediate of Formula 4. Also disclosed is a compound, phenylmethyl N-[2-oxo-2-[(2,2,2-trifluoroethyl)amino]ethyl]carbamate (a compound of Formula 4).