Continuous Flow Synthesis of Sulfonylurea Compounds
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Solution Overview
Problem
Existing synthesis methodologies for sulfonylurea compounds like gliclazide, chlorpropamide, and tolbutamide are inefficient and rely heavily on batch reactor processes using significant volumes of organic solvents, and transferring these processes to flow synthesis requires significant reaction condition and reagent modifications that are not obvious, particularly for continuous multistep reactions.
Innovation Solution
A flow synthesis process is developed for producing sulfonylurea compounds, involving the preparation of carbamates from amines and sulfonamides using specific bases like DBU, TEA, and TBA, with controlled temperatures and molar ratios, allowing for continuous multistep reactions without intermediate isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If batch reactor processes are used for synthesizing sulfonylurea compounds, then the process is easier to implement with conventional equipment, but the process efficiency is low and significant volumes of organic solvents are required
Solution Approach 1:
The patent replaces conventional batch reactor mechanical processes with flow chemistry technology, using continuous flow systems instead of traditional batch mixing. This substitution enables higher productivity and reduced solvent volumes while maintaining ease of implementation through modular flow reactors
Solution Approach 2:
The patent changes key process parameters by transitioning from batch to continuous flow operation, adjusting residence time, temperature profiles, and reagent addition rates to optimize both productivity and solvent reduction while keeping the process implementable
2Device complexity
If batch reactor processes are used for synthesizing sulfonylurea compounds, then the process setup is simpler, but significant volumes of organic solvents are used
Solution Approach 1:
The patent replaces batch reactor operations with continuous flow chemistry systems that inherently require smaller solvent volumes due to improved mass transfer and reaction efficiency, while maintaining relatively simple setup through modular flow reactor designs
Solution Approach 2:
The patent changes solvent volume parameters by optimizing flow rates, residence times, and concentration levels in the continuous flow system, achieving reduced organic solvent usage while keeping device complexity manageable
3Productivity
If flow synthesis is implemented for producing sulfonylurea compounds, then productivity and efficiency are improved, but significant reaction condition and reagent modifications are required
Solution Approach 1:
The patent replaces batch processing with continuous flow chemistry, achieving improved productivity through enhanced heat and mass transfer, while the modular nature of flow reactors makes the required modifications more systematic and manageable
4Ease of manufacture
If conventional batch processes are used, then fewer modifications are needed, but the process is less efficient and uses more solvents
Solution Approach 1:
The patent replaces batch reactor processes with continuous flow chemistry systems that reduce solvent waste through improved reaction efficiency and better control of reagent consumption, while maintaining ease of manufacture through modular flow reactor designs
Solution Approach 2:
The patent changes operational parameters in the flow system to optimize reagent utilization and reduce solvent waste, achieving this while keeping the overall process simplicity comparable to conventional batch methods
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
The process achieves high yields and throughputs of sulfonylurea compounds, with single-step synthesis rates of 91-97% and multistep synthesis rates of 87-94%, overcoming the inefficiencies of traditional batch processes and enabling safer, more efficient production.
Implementation Method 1
reacting free amine RNH2 or amine HCl salt with haloformate of Formula (4) in the presence of a base selected from 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), trimethylamine (TEA), and tributyl amine (TBA)
Implementation Method 2
reacting the carbamate of Formula (2) with the sulfonamide of Formula (3) in the presence of a base selected from 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), trimethylamine (TEA), and tributyl amine (TBA)
Data Source
Figure 1~2
Figure 3
AI summary
This invention provides a flow synthesis process for producing sulfonylurea compounds of formula (1), including gliclazide, chlorpropamide and tolbutamide, and pharmaceutically acceptable salts thereof.