One-Pot Piperazinyl Benzamide Synthesis Process
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Solution Overview
Problem
There is a need for efficient processes suitable for large-scale and commercial production of piperazinyl and diazepanyl benzamide derivatives, which are effective for treating histamine receptor-mediated disorders, as existing methods are not practical for commercial scale due to requirements of multiple solvents and costly purification steps.
Innovation Solution
A process involving the reaction of a compound of formula (X) with a leaving group in a first solvent, followed by reaction with a compound of formula (XII) in the presence of a base in a second solvent, and then with a reducing agent in a third solvent, without the need for isolation of intermediates, allowing for a single solvent system and reducing the complexity and cost of the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing methods are used for preparation of piperazinyl and diazepanyl benzamide derivatives, then the compounds can be synthesized, but the process requires multiple solvents and costly purification steps making it unsuitable for large-scale commercial production
Solution Approach 1:
The invention extracts and eliminates the problematic intermediate isolation and purification steps from the synthesis process. By directly reacting the crude intermediate from the first step with the second reagent, the method removes the need for separate purification operations, thereby simplifying the overall process and making it suitable for commercial scale production
Solution Approach 2:
The invention merges multiple synthesis steps into a continuous one-pot process. The reaction of compound (X) with leaving group to form intermediate (XI), followed by reaction with compound (XII) to form (XIII), and finally reduction with compound (XIV) to yield product (I), all occur in sequence without isolating intermediates, combining what were previously separate operations into a unified process
2Productivity
If existing methods are used for preparation of piperazinyl and diazepanyl benzamide derivatives, then the compounds can be synthesized, but multiple solvents are required increasing process complexity and cost
Solution Approach 1:
The invention employs a universal solvent system that can accommodate multiple reaction types (substitution, coupling, and reduction) within the same medium. This multi-functional approach eliminates the need to switch between different solvents for different reaction steps, thereby reducing the total quantity of solvents required and improving production efficiency
Solution Approach 2:
The invention performs preliminary action by conducting all reactions in a pre-selected suitable solvent from the beginning, rather than changing solvents between steps. This preliminary selection of a versatile solvent prevents the need for subsequent solvent exchanges, reducing both the number and quantity of solvents needed throughout the synthesis process
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 process enables the efficient production of piperazinyl and diazepanyl benzamide derivatives, facilitating their use in treating histamine receptor-mediated disorders without the impracticalities of existing methods, such as the need for multiple solvents and costly purification steps, thus making them more viable for commercial applications.
Implementation Method 1
reacting the compound of formula (XIII) with a compound of formula (XIV); in the presence of a reducing agent; to yield the corresponding compound of formula (I)
Data Source
AI summary
The present invention is directed to novel processes for the preparation of substituted piperazinyl and diazepanyl benzamides of formula (I), as defined in the specification, useful for the treatment of disorders and conditions mediated by the histamine receptor.