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.