N-H or N-alkyl 2-propynamide Synthesis via Water-Based Amine Addition
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Solution Overview
Problem
Current methods for synthesizing N—H or N-alkyl 2-propynamides are inefficient and environmentally unfriendly, requiring low temperatures and non-aqueous solvents, which are costly and generate waste, making them unsuitable for commercial pharmaceutical production.
Innovation Solution
The synthesis of N—H or N-alkyl 2-propynamides is achieved by reacting methyl or ethyl propiolate with corresponding amines in water at temperatures between −10° C. to 10° C., eliminating the need for low temperatures and organic solvents, and allowing for high-purity product formation with reduced side product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If low temperature conditions (−30°C to −60°C) are used to favor amide product formation over Michael adduct, then product selectivity is improved, but energy consumption and equipment investment increase significantly
Solution Approach 1:
The patent changes the temperature parameter from extremely low (−30°C to −60°C) to moderate low (−10°C to 10°C), and changes the solvent parameter from organic solvents to water. This combination of parameter changes maintains high product selectivity while dramatically reducing energy consumption and equipment requirements for commercial production.
Solution Approach 2:
The patent replaces expensive cooling equipment and energy-intensive systems with simple refrigeration or ice-bath systems. The use of water as solvent eliminates the need for specialized anhydrous conditions and expensive organic solvents, making the process economically viable for commercial production.
2Use of energy by stationary object
If activated propiolic acid derivatives are used to avoid low temperature conditions, then energy consumption is reduced, but additional chemical steps and waste generation increase
Solution Approach 1:
The patent extracts the activation step from the synthesis pathway by using methyl or ethyl propiolate directly, which are stable, commercially available reagents that do not require pre-formation of activated intermediates. This eliminates the additional chemical steps and waste associated with generating activated propiolic acid derivatives.
Solution Approach 2:
The patent employs a self-service approach where methyl or ethyl propiolate serves as both the starting material and the activated electrophile in one step. The ester group provides sufficient electrophilic character for amine reaction without requiring additional activation, simplifying the process and reducing waste.
3Use of energy by stationary object
If activated propiolic acid derivatives are used to avoid low temperature conditions, then energy consumption is reduced, but process complexity and solvent requirements increase
Solution Approach 1:
The patent removes the complex multi-step activation sequence from the synthesis pathway. By using methyl or ethyl propiolate directly, the process requires only simple mixing and mild heating or cooling, eliminating the need for multiple reaction vessels, intermediate isolation steps, and specialized equipment.
4Manufacturing precision
If conventional amide bond formation methods are used, then product selectivity is improved, but environmental impact and cost increase
Solution Approach 1:
The patent changes the solvent parameter from organic solvents to water, and adjusts the temperature to moderate conditions (−10°C to 10°C). This maintains high product selectivity while eliminating environmental hazards associated with organic solvents and reducing energy consumption, achieving green chemistry goals.
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 enables the production of high-quality N—H or N-alkyl 2-propynamides with good chemical yield and environmental sustainability, reducing energy consumption and waste generation, making it suitable for commercial pharmaceutical production.
Implementation Method 1
reacting methyl or ethyl propiolate with corresponding amine in water
Data Source
AI summary
Disclosed is a method for the synthesis of N—H or N-alkyl 2-propynamides useful as intermediate in the manufacture of pharmaceutically active ingredients.