Abstract
A variety of alkynylated amines, amides, and imides are reacted in the superacid system HF-SbF5 to give regioselectively new beta-gem-difluoroamines. The reaction, which is not observed in pure HF, is consistent with the formation of a dicationic intermediate (i.e., both vinylic and adjacent protonated N-ammonium cations). Application to the regioselective and efficient synthesis of difluorinated cinchona alkaloid derivatives is described.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Alkynes / chemistry*
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Amides / chemistry
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Amines / chemistry
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Antimony / chemistry*
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Cations / chemistry
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Cinchona Alkaloids / chemical synthesis*
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Cinchona Alkaloids / chemistry
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Crystallography, X-Ray
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Fluorides / chemistry*
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Halogenation
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Hydrocarbons, Fluorinated / chemical synthesis*
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Hydrocarbons, Fluorinated / chemistry
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Hydrofluoric Acid / chemistry*
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Imides / chemistry
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Models, Molecular
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Molecular Structure
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Stereoisomerism
Substances
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Alkynes
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Amides
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Amines
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Cations
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Cinchona Alkaloids
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Hydrocarbons, Fluorinated
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Imides
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antimony pentafluoride
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Antimony
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Fluorides
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Hydrofluoric Acid