Amide Addition Reaction for Cooling Compounds
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Solution Overview
Problem
The existing methods for preparing N-substituted p-menthane carboxamides, which provide a cooling sensation, are inefficient due to the use of expensive materials and processes.
Innovation Solution
A cost-effective method involving the reaction of RCONH2 with a vinyl pyridine derivative in the presence of a base and solvent, such as xylene or dimethyl formamide, under controlled conditions like heating or pressure, to produce compounds like N-(2-pyridin-2-ylethyl) p-menthanecarboxamide, which can include chelating agents like crown ethers for higher yields and faster reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reaction of menthane carboxylic acid chloride with monoamine is used, then the compounds can be prepared efficiently, but expensive materials are involved
Solution Approach 1:
The patent replaces expensive acid chloride reagents with inexpensive amides as starting materials. The amides are readily available, low-cost compounds that undergo addition reaction with vinyl pyridines to produce the desired N-substituted p-menthane carboxamides, thereby eliminating the need for costly acid chloride reagents and associated expensive catalysts and conditions.
Solution Approach 2:
The patent changes the chemical parameters of the starting materials from acid chlorides to amides. This parameter change fundamentally alters the reaction pathway, allowing for milder conditions, lower costs, and simpler procedures while maintaining high productivity in synthesizing cooling compounds.
2Ease of manufacture
If conventional preparation methods are used, then compounds can be produced, but the process is costly and less efficient
Solution Approach 1:
The patent employs inexpensive amides and vinyl pyridines as starting materials, replacing costly acid chloride-based methodologies. This substitution dramatically reduces raw material costs and eliminates the need for expensive auxiliary reagents, making the manufacturing process both cheaper and more efficient.
Solution Approach 2:
The reaction system is designed to proceed under self-sufficient conditions with minimal external intervention. The base-catalyzed addition of amides to vinyl pyridines occurs readily in common solvents without requiring specialized equipment, expensive catalysts, or complex workup procedures, thereby improving both ease of manufacture and productivity.
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 allows for the efficient and inexpensive production of N-substituted p-menthane carboxamides with high yields, reducing production costs while maintaining the cooling properties of the compounds.
Implementation Method 1
the reaction being performed in a solvent in the presence of a base
Implementation Method 2
The solvent may be any suitable solvent. It may be capable of dissolving all the reactants and the reaction product.
Implementation Method 3
the reaction is heated or performed under pressure, for example, in a bomb or in a sealed microwave vessel
Implementation Method 4
the reaction is heated or performed under pressure
Data Source
AI summary
A method of making a compound of formula (II) comprising the reaction of a compound of formula RCONH2 with a compound of formula (III) R being a moiety having between 1 and 15 carbon atoms and optionally from 1 to 5 heteroatoms independently selected from oxygen, nitrogen and sulfur, and X and Y being independently selected from the group consisting of H, methyl, ethyl, OMe, Oet, and mixtures thereof; the reaction being performed in a solvent in the presence of a base. The method is useful for the inexpensive manufacture of certain commercially-valuable compounds, including some that have desirable cooling properties.