Magnetic Core-Shell Tungsten Catalyst for Quinolone Synthesis
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Solution Overview
Problem
The synthesis of quinolone drugs is cumbersome, generates significant waste, and is costly due to the complexity of existing methods, necessitating a more efficient catalyst preparation and synthesis technique.
Innovation Solution
A magnetic separable core-shell structure supported tungsten composite catalyst (WO3/SiO2/Fe3O4) is prepared through a method involving the steps of forming Fe3O4 colloid, reacting with tetraethyl orthosilicate to create SiO2/Fe3O4 composite nanoparticles, and then incorporating ammonium metatungstate, followed by calcination, which is used to catalyze the synthesis of quinolone compounds with improved efficiency and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional multi-step synthesis method is used for quinolone drugs, then the synthesis can be completed with existing technology, but the process becomes cumbersome with many steps, generating large amounts of waste and increasing costs
Solution Approach 1:
The patent merges multiple synthesis steps into a one-pot reaction process. The traditional three-step synthesis (condensation, cyclization, and hydrolysis) is combined into a single reaction vessel where all transformations occur sequentially without isolation of intermediates, thereby simplifying the process and reducing waste while maintaining productivity
Solution Approach 2:
The magnetic separable core-shell structure supported tungsten composite catalyst serves multiple functions: it catalyzes the condensation reaction, facilitates cyclization, and enables easy separation from the reaction mixture through magnetic means. This multi-functional catalyst reduces process complexity while maintaining high synthesis efficiency
2Ease of manufacture
If traditional synthesis method is used, then the existing procedure can be followed, but large amounts of three wastes are generated and costs increase
Solution Approach 1:
The magnetic separable catalyst enables easy recovery of the catalyst from the reaction mixture through magnetic separation. The catalyst can be reused multiple times, reducing material waste. Additionally, the one-pot synthesis eliminates the need to isolate and discard intermediate products, significantly reducing three wastes generation while simplifying manufacturing
Solution Approach 2:
The core-shell structure acts as an intermediary that facilitates the reaction while remaining separable. The shell structure allows the catalyst to mediate the reaction effectively and then be easily separated for reuse, minimizing waste generation and simplifying the manufacturing process
3Productivity
If conventional catalyst is used, then the synthesis can proceed, but the catalyst cannot be easily recovered and reused, increasing costs
Solution Approach 1:
The magnetic separable core-shell structure supported tungsten composite catalyst can be easily recovered from the reaction mixture through magnetic separation and reused multiple times without significant loss of catalytic activity. This maintains high reaction efficiency while enabling catalyst recyclability, reducing costs and improving sustainability
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 reduces production costs, minimizes waste, and enhances product quality by improving coupling efficiency and allowing for the reuse of the catalyst, resulting in a simpler, more efficient, and environmentally friendly process for synthesizing quinolone compounds.
Implementation Method 1
adding a reducing agent and a base into an aqueous solution of iron compound, heating to 50-80° C. and stirring to obtain Fe3O4 colloid
Implementation Method 2
adding the Fe3O4 colloid obtained in the step 1), tetraethyl orthosilicate and a hydrolysis catalyst into an appropriate amount of dispersion solvent and allowing to react for 4-8 hours to obtain SiO2/Fe3O4 composite nano-particles
Implementation Method 3
which is calcined at 450-650° C. for 1-6 hours to obtain a magnetic separable core-shell structure supported tungsten composite catalyst
Data Source
AI summary
The present invention discloses a core-shell structure supported tungsten composite catalyst and a preparation method and use thereof. Most of the existing synthesis methods of the main ring of quinolone drugs have the defects of many synthesis steps, cumbersome operation, large amount of three wastes, higher costs and the like. The present invention prepares a magnetic separable core-shell supported tungsten composite catalyst, WO3/SiO2/Fe3O4, by preparing Fe3O4 colloid and SiO2/Fe3O4 composite nano-particles. This magnetic separable core-shell supported tungsten composite catalyst, WO3/SiO2/Fe3O4, is used to catalyze and synthesize quinolone compounds. The present invention provides an efficient preparation method of quinolone compounds using a catalyst which can be recovered by magnetic separation and recycled. The catalyst prepared by the present invention can be reused in the preparation of quinolone compounds and still retains the original activity without deactivation, which not only greatly improves the production efficiency, but also reduces the environmental pollution.