Aromatic Fluorination via Sulfuryl Fluoride and Aryl Intermediates
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Solution Overview
Problem
Current methodologies for forming carbon-fluorine (C—F) bonds in selectively fluorinated aromatic compounds are often expensive and inefficient, particularly when using phenols and their derivatives, necessitating the development of a more cost-effective and efficient method for fluorinating aromatic compounds.
Innovation Solution
The method involves forming a reaction mixture comprising an aryl fluorosulfonate, an aryloxylate salt, or an aryl hydroxy compound with sulfuryl fluoride and a fluorinating reagent, allowing the mixture to react, and isolating the resulting fluorinated aryl species, which can be done in the presence or absence of a solvent, without the need for expensive catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive reagents are used for fluorinating aromatic compounds, then the formation of C—F bonds is achieved, but the cost increases
Solution Approach 1:
The patent replaces expensive reagents with inexpensive, readily available materials such as sulfuryl fluoride and common bases. The method uses simple, disposable reagents that can be easily obtained without requiring costly specialized chemicals, thereby reducing manufacturing costs while maintaining effective fluorination capability
Solution Approach 2:
The patent changes the chemical parameters of the reaction system by using sulfuryl fluoride as the fluorine source and employing common bases like cesium carbonate or potassium carbonate. This parameter change from expensive reagents to inexpensive alternatives achieves the same C—F bond formation with significantly reduced cost
2Reliability
If traditional methods are used for fluorination, then C—F bonds are formed, but the reaction time is long
Solution Approach 1:
The patent optimizes reaction parameters by conducting the fluorination at elevated temperatures (80-120°C) and using specific solvent systems. These parameter changes accelerate the reaction rate, reducing the reaction time from traditional prolonged periods to 12-36 hours while maintaining high yields of fluorinated products
Solution Approach 2:
The method employs periodic monitoring and adjustment of reaction conditions, allowing the reaction to proceed efficiently through optimized time intervals. The reaction is permitted to proceed for specific periods (12-36 hours) with controlled conditions, achieving complete conversion without excessive time investment
3Ease of manufacture
If simple reagents are used for fluorination, then the cost is reduced, but the efficiency decreases
Solution Approach 1:
The patent achieves both low cost and high efficiency by optimizing reaction parameters including temperature (80-120°C), solvent selection (polar aprotic solvents like DMF or DMSO), and stoichiometry. These parameter optimizations ensure that inexpensive reagents react efficiently to produce high yields of fluorinated products within 12-36 hours
Solution Approach 2:
The method employs an intermediary base (such as cesium carbonate, potassium carbonate, or sodium hydroxide) that facilitates the reaction between sulfuryl fluoride and the aromatic substrate. This intermediary enables the simple, inexpensive reagents to work together efficiently, maintaining high productivity while keeping costs low
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 approach provides a cost-effective and efficient method for preparing aryl fluorides, achieving high yields within a short reaction time, typically 12-36 hours, without the use of expensive reagents or catalysts, and is applicable to a wide range of aryl and heteroaryl groups.
Implementation Method 1
A common strategy for the formation of these C—F bonds is through nucleophilic aromatic substitution by replacing an aryl-X bond
Implementation Method 2
reacting the aryl fluorosulfonate and the fluorinating reagent to provide a fluorinated aryl species
Data Source
AI summary
Disclosed is a fluorination method comprising providing an aryl fluorosulfonate and a fluorinating reagent to a reaction mixture; and reacting the aryl fluorosulfonate and the fluorinating reagent to provide a fluorinated aryl species.Also disclosed is a fluorination method comprising providing, a salt comprising a cation and an aryloxylate, and SO2F2 to a reaction mixture; reacting the SO2F2 and the ammonium salt to provide a fluorinated aryl species.Further disclosed a fluorination method comprising providing a compound having the structure Ar—OH to a reaction mixture; where Ar is an aryl or heteroaryl; providing SO2F2 to the reaction mixture; providing a fluorinating reagent to the reaction mixture; reacting the SO2F2, the fluorinating reagent and the compound having the structure Ar—OH to provide a fluorinated aryl species having the structure Ar—F.