1,5-Benzothiazepine Synthesis with Single-Solvent Processing
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Solution Overview
Problem
Existing processes for preparing 1,5-benzothiazepine compounds, such as elobixibat, are inefficient due to the large number of steps, use of multiple solvents, and requirement for extensive purification, making them unsuitable for industrial-scale production.
Innovation Solution
A process using a triazine compound to react compounds of formulas (II) and (III), followed by deprotection, to produce 1,5-benzothiazepine compounds in high yields and purity using a single solvent, thereby reducing solvent usage and eliminating intermediate purification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple solvents and reagents are used in different steps, then the preparation process can achieve the desired product, but the cost for removing solvents becomes expensive and the process complexity increases
Solution Approach 1:
The patent applies universality by using a single solvent system (acetonitrile or dichloromethane) that serves multiple functions across different reaction steps including carbonylation, hydrolysis, and workup operations. This eliminates the need to switch between multiple solvents, reducing process complexity while maintaining product purity through consistent solvent properties throughout the synthesis sequence.
2Manufacturing precision
If multiple purification steps are performed for intermediate compounds, then the product purity is improved, but the production time and cost increase
Solution Approach 1:
The patent applies the extraction principle by removing the intermediate purification steps entirely from the process flow. The reaction conditions are optimized so that intermediates remain in solution or precipitate in a controlled manner that allows direct progression to the next step without isolation, thereby eliminating time-consuming filtration, drying, and characterization operations while maintaining final product purity.
Solution Approach 2:
The patent implements continuity by designing a telescoped process where the output of one reaction step directly becomes the input for the next step without interruption. The reaction mixture proceeds continuously through carbonylation, hydrolysis, and workup operations, eliminating the breaks and handling operations that would occur with intermediate isolation, thus significantly improving production efficiency.
3Manufacturing precision
If a large number of steps and reagents are used, then the desired chemical transformations can be achieved, but the process is not suitable for industrial scale production
Solution Approach 1:
The patent applies merging by combining multiple reaction steps into a single continuous operation. The carbonylation, hydrolysis, and workup steps that would traditionally be separate operations with intermediate isolations are merged into one continuous process flow using a single solvent system, reducing the number of unit operations and making the process suitable for industrial scale production while maintaining reaction completeness.
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the solvent system and reaction conditions so that all subsequent steps can proceed without requiring additional solvent changes or purification interventions. The initial choice of acetonitrile or dichloromethane as the solvent is made to facilitate all downstream operations, eliminating the need for later adjustments and simplifying the overall manufacturing process for industrial scale-up.
4Manufacturing precision
If different solvents are used in different steps, then each reaction can be optimized, but the amount of solvent required increases and removal cost increases
Solution Approach 1:
The patent applies universality by selecting a single solvent (acetonitrile or dichloromethane) that is capable of supporting all reaction steps including carbonylation, hydrolysis, and workup operations. This eliminates the need to use multiple different solvents for different steps, significantly reducing total solvent consumption and the associated removal costs while maintaining optimal reaction conditions throughout the process sequence.
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 achieves high yields and purity of 1,5-benzothiazepine compounds while minimizing solvent consumption and eliminating the need for intermediate purification, making it suitable for industrial-scale production at a lower cost.
Implementation Method 1
reacting a compound of formula (II) with a compound of formula (III) in the presence of a triazine compound to obtain a compound of formula (IV)
Implementation Method 2
deprotecting said compound of formula (IV) to obtain the compound of formula (I)
Data Source
AI summary
The present invention relates to a process for the preparation of a compound of formula (I) comprising: reacting a compound of formula (II) with a compound of formula (III) in the presence of a triazine compound to obtain a compound of formula (IV), and deprotecting said compound of formula (IV) to obtain the compound of formula (I). The compound of formula (I) can be prepared by the process according to the present invention in high yields and high purity. In addition, the process according to the present invention does not use a large amount of solvents or require a purification process of intermediate compounds.