Oxidative Fluorination of Cyclopropylamides through Organic Photoredox Catalysis
Angewandte Chemie(2020)
Abstract
We report an oxidative ring-opening strategy to transform cyclopropylamides and cyclobutylamides into fluorinated imines. The imines can be isolated in their more stable hemiaminal form, with the fluorine atom installed selectively at the gamma or delta position. Both inexpensive benzophenone with UVA light or organic and inorganic dyes with blue light could be used as photoredox catalysts to promote this process. Various fluorinated amines were then obtained by nucleophilic attack on the hemiaminals in one pot, giving access to a broad range of useful building blocks for medicinal chemistry.
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Key words
aminocyclopropanes,benzophenone,fluorination,photocatalysis,ring-opening
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