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Novel method for incorporating the CHF(2) group into organic molecules using BrF(3)
Revital Sasson1, Aviv Hagooly, Shlomo Rozen
1School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel.
Organic Letters
|February 28, 2003
Summary
New methods convert alkyl bromides into 1,1-difluoromethyl alkanes using 1,3-dithiane derivatives and bromine trifluoride. This reaction is efficient for primary alkyl halides, yielding valuable difluoromethyl compounds.
Area of Science:
- Organic Chemistry
- Fluorine Chemistry
Background:
- 1,3-dithiane derivatives are versatile synthetic intermediates.
- Efficient synthesis of difluoromethyl compounds is important in medicinal chemistry and materials science.
Purpose of the Study:
- To develop a novel method for synthesizing 1,1-difluoromethyl alkanes.
- To investigate the utility of 2-alkyl-1,3-dithiane derivatives in fluorination reactions.
Main Methods:
- Preparation of 2-alkyl-1,3-dithiane derivatives from alkyl bromides.
- Reaction of dithiane derivatives with bromine trifluoride (BrF3).
Main Results:
- Successful synthesis of 1,1-difluoromethyl alkanes (RCHF2) in 60-75% yield.
- The reaction is effective for primary alkyl halides.
- Yields are limited for secondary alkyl halides due to dithiane preparation efficiency.
- The presence of two sulfur atoms in the dithiane ring is crucial for the transformation.
Conclusions:
- 2-Alkyl-1,3-dithiane derivatives provide a viable route to 1,1-difluoromethyl alkanes.
- Bromine trifluoride is an effective reagent for this difluoromethylation process.
- The method shows promise for accessing fluorinated organic compounds.