Telescoped Synthesis of Aryloxy Diaminopyrimidines
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Solution Overview
Problem
There is a need for effective methods to prepare compounds that modulate P2X 3 and P2X 2/3 receptors, which are implicated in various diseases including genitourinary, gastrointestinal, and pain-related disorders, as existing methods are inefficient and generate significant solvent waste.
Innovation Solution
A process involving treating a compound with Bredereck's reagent to form an aminal compound, followed by reaction with an aniline reagent and then a guanidine reagent, to produce compounds that are effective modulators of P2X 3 and P2X 2/3 receptors, reducing the number of reaction steps and solvent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If existing methods are used to prepare P2X receptor modulators, then the compounds can be produced, but the process generates significant solvent waste and requires multiple reaction steps with intermediate isolations
Solution Approach 1:
The patent combines multiple reaction steps into a one-pot telescoped process where the aminal formation, aniline coupling, and guanidine substitution reactions occur sequentially in the same reaction vessel without isolating intermediates. This merging of operations eliminates the need for separate workup and purification steps between reactions, significantly reducing solvent waste while maintaining production efficiency.
Solution Approach 2:
The telescoped process maintains continuous useful action by immediately proceeding from one reaction to the next without interruption or isolation of intermediates. The reaction mixture is directly treated with the next reagent after the previous reaction completes, ensuring that the useful chemical transformation continues uninterrupted throughout the synthesis sequence.
2Ease of manufacture
If existing methods are used to prepare P2X receptor modulators, then the compounds can be produced, but the number of reaction steps and intermediate isolations increases process complexity
Solution Approach 1:
The patent merges three distinct reaction steps (aminal formation, aniline coupling, and guanidine substitution) into a single telescoped operation. This reduces the number of separate reaction vessels, heating/cooling cycles, and isolation steps required, thereby simplifying the manufacturing process while reducing overall process complexity.
Solution Approach 2:
The process performs preliminary actions by pre-planning the sequential addition of reagents in a specific order within a single reaction vessel. The reaction conditions and reagent additions are designed in advance to ensure each transformation proceeds efficiently without requiring intermediate handling, making the overall process easier to manufacture.
3Productivity
If existing methods are used to prepare P2X receptor modulators, then the compounds can be produced, but the time required for multiple reaction steps and intermediate isolations increases
Solution Approach 1:
The telescoped process eliminates idle time between reactions by maintaining continuous useful action throughout the synthesis. Each reaction proceeds immediately after the previous one completes without interruption for isolation or setup of new equipment, maximizing the productive use of time and increasing the overall production rate.
Solution Approach 2:
The process skips the time-consuming intermediate isolation and purification steps by directly proceeding from one reaction to the next in the same vessel. This rushing through the synthesis sequence without stopping for intermediate handling significantly reduces the total time required while maintaining 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 results in high-yield production of P2X receptor modulators with fewer intermediate isolations and reduced solvent waste, making it a more efficient approach for treating conditions associated with these receptors.
Implementation Method 1
treating a compound with Bredereck's reagent, to form an aminal compound
Implementation Method 2
followed by reaction with an aniline reagent and then a guanidine reagent
Implementation Method 3
followed by reaction with an aniline reagent and then a guanidine reagent, to produce compounds that are effective modulators of P2X 3 and P2X 2/3 receptors
Data Source
AI summary
A method for preparing a compound of formula (I) the method comprising treating a compound of formula (d) with an iodination reagent, to form the compound of formula I, wherein R1, R2 and R3 are as defined herein.