Visible-Light-Induced Triple Catalysis For A Ring-Opening Cyanation Of Cyclopropyl Ketones

An unprecedented triple catalytic, general ring-opening cyanation reaction of cyclopropyl ketones for the construction of gamma-cyanoketones is described. The key is to merge photoredox catalysis with Lewis acid catalysis and copper catalysis to enable the selective cleavage of the carbon-carbon bonds and the selective coupling of the generated radical and cyanide anion.