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Visible light-promoted CO2 fixation with imines to synthesize diaryl α-amino acids
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Visible light-promoted CO2 fixation with imines to synthesize diaryl α-amino acids
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Visible light-promoted CO2 fixation with imines to synthesize diaryl α-amino acids
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Journal Article
Visible light-promoted CO2 fixation with imines to synthesize diaryl α-amino acids
2018
Overview
Light-mediated transformations with CO
2
have recently attracted great attention, with the focus on CO
2
incorporation into C–C double and triple bonds, organohalides and amines. Herein is demonstrated visible light -mediated umpolung imine reactivity capable of engaging CO
2
to afford α-amino acid derivatives. By employing benzophenone ketimine derivatives, CO
2
fixation by hydrocarboxylation of C=N double bonds is achieved. Good to excellent yields of a broad range of α,α–disubstituted α-amino acid derivatives are obtained under mild conditions (rt, atmospheric pressure of CO
2
, visible light). A procedure that avoids tedious chromatographic purification and uses sustainable sunlight is developed to highlight the simplicity of this method.
Fixation of CO
2
in organic molecules is an area of great interest due to the implications in sustainable chemistry. Here, the authors show a visible light-mediated hydrocarboxylation of ketimines with atmospheric CO
2
to afford a number of α,α–diaryl α-amino acid derivatives.
