Visible Light Promoted [3+2]-Cycloaddition for the Synthesis of Cyclopenta[b]chromenocarbonitrile Derivatives
Ewelina Kowalska1, Mateusz Dyguda1, Angelika Artelska2
1Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, Łódź 90-924, Poland.
Abstract:
In the manuscript, a novel method for the preparation of cyclopenta[b]chromenocarbonitrile derivatives via [3+2] cycloaddition reaction of substituted 3-cyanochromones and N-cyclopropyloamines initiated by visible light catalysis has been described. The reaction was performed in the presence of Eosin Y as a photocatalyst. The key parameters responsible for the success of the described strategy are visible light, a small amount of photoredox catalyst, an anhydrous solvent, and an inert atmosphere.
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