Fluorinated Compound Synthesis via Boronate Intermediates
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Solution Overview
Problem
The synthesis of fluorinated compounds, particularly those trifluoromethylated at sp3-hybridized carbon centers, is challenging due to their elusive nature and physical limitations such as insolubility and non-biodegradability, limiting their applications in medicinal chemistry and materials science.
Innovation Solution
A method involving the reaction of a compound with CF3—CH═N2, followed by optional reactions with KHF2, pinacol, an oxidizing reagent, or a protodeboronating agent to form α-trifluoromethylated compounds, which can then be further modified to produce fluorinated products with specific structures and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods are used to incorporate fluorinated groups into organic molecules, then fluorinated compounds can be synthesized, but the synthesis is challenging and yields are limited due to insolubility and non-biodegradability
Solution Approach 1:
The patent applies preliminary action by first installing a boronate ester group onto the organic molecule, which serves as a handle for subsequent trifluoromethylation. This preliminary functionalization enables the later introduction of the CF3 group under milder and more reliable conditions, overcoming the direct fluorination challenges
Solution Approach 2:
The boronate ester group acts as an intermediary that facilitates the introduction of the trifluoromethyl group. The boronate ester reacts with CF3CHN2 to form an α-trifluoromethylated intermediate, which can then be converted to the final fluorinated product, thereby mediating the complex fluorination process
2Quantity of substance
If polyfluorinated groups are incorporated into organic molecules, then fluorinated compounds are obtained, but physical limitations such as insolubility and non-biodegradability arise
Solution Approach 1:
The patent applies local quality by introducing the trifluoromethyl group at a specific position (α-position) relative to the boronate ester group, rather than random fluorination. This localized modification at the sp3-hybridized carbon center provides the desired fluorinated functionality while maintaining control over the molecule's overall properties
Solution Approach 2:
The patent employs parameter changes by varying the substitution pattern (n = 1 to 50) and the R groups in the boronate ester structure to modulate the physical properties of the final fluorinated compound, thereby improving solubility and biodegradability while maintaining the fluorinated functionality
3Adaptability or versatility
If access to compounds trifluoromethylated at sp3-hybridized carbon centers is pursued, then novel fluorinated structures can be obtained, but the synthesis has been elusive
Solution Approach 1:
The patent establishes a universal methodology that works across diverse substrates by using the boronate ester as a common platform. The same reaction sequence (boronate ester formation followed by CF3CHN2 treatment) applies to various R groups and substitution patterns, providing broad structural diversity with a single reliable approach
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 enables the isolation of stable α-trifluoromethylated compounds, expanding the range of fluorinated products that can be synthesized and potentially improving their solubility and biodegradability, thus enhancing their utility in medicinal and materials applications.
Implementation Method 1
reacting a reagent comprising a compound of Formula (II), or a compound of Formula (III) with CF3—CH═N2 to form an α-trifluoromethyl compound
Implementation Method 2
further reacting the α-trifluoromethyl compound with KHF2, pinacol, an oxidizing reagent, or a protodeboronating agent under conditions sufficient to form a compound of Formula (I)
Data Source
AI summary
The invention is directed to the preparation of fluorinated compounds and their use in organic synthesis. In particular, the invention is directed to methods of reacting compounds of structure with Rf—CH═N2 or (CF3)2C═N2 to form a perfluoroalkylate or -arylated compounds, and products derived from these reactions, where X, YB, and Rf are described herein.