Fluorinated Isoxazolone Synthesis Without O-Substituted By-Products
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Solution Overview
Problem
The production of 3-isoxazolone and 5-isoxazolone compounds with substituents at specific positions often results in by-products where the substituents are introduced onto the oxygen atoms of the isoxazolone ring, which is undesirable.
Innovation Solution
A method involving the reaction of fluoroisobutanoic acid fluoride derivatives or fluoroisobutene/fluoroisobutane derivatives with specific compounds to produce fluorine-containing isoxazolone compounds without forming O-substituted by-products, using general formulas (1) to (7) to specify the reaction components and products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reaction is used to introduce substituents into the 2-position of the isoxazolone ring, then the desired 3-isoxazolone or 5-isoxazolone compound is produced, but O-substituted by-products are simultaneously formed
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by introducing a fluorine atom at the 4-position of the isoxazolone ring. This parameter change (adding fluorine substitution) fundamentally alters the reactivity pattern, directing the incoming substituent exclusively to the C-2 position while preventing O-substitution, thereby resolving the selectivity issue without requiring complex purification steps
Solution Approach 2:
The invention converts the potential harm of O-substitution by-products into a benefit by strategically placing a fluorine atom at the 4-position. This fluorine substitution creates an electronic effect that deactivates the oxygen atom toward substitution while activating or directing the C-2 position, thus transforming what would be a harmful side reaction into a beneficial selectivity enhancement
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 allows for the production of 3-isoxazolone and 5-isoxazolone compounds with trifluoromethyl groups at the 4-position and specific substituents at other positions, avoiding O-substituted by-products and enabling compounds with enhanced biological activities and structural flexibility.
Implementation Method 1
A method involving the reaction of fluoroisobutanoic acid fluoride derivatives or fluoroisobutene/fluoroisobutane derivatives with specific compounds to produce fluorine-containing isoxazolone compounds
Data Source
AI summary
To provide a 3-isoxazolone compound having a trifluoromethyl group at the 4-position and specific substituents at the 2- and 5-positions of the isoxazolone ring, and a 5-isoxazolone compound having a trifluoromethyl group at the 4-position and specific substituents at the 2- and 3-positions of the isoxazolone ring. To provide a production method capable of simply producing, without producing an O-substituted product as a by-product, a 3-isoxazolone compound and a 5-isoxazolone compound by reacting certain raw materials. A fluorine-containing isoxazolone compound represented by the following general formula (1):