Direct β-Alkylation of Aldehydes via Photoredox Organocatalysis

Direct beta-alkylation of saturated aldehydes has been accomplished by synergistically combining photoredox catalysis and organocatalysis. Photon-induced enamine oxidation provides an activated beta-enaminyl radical intermediate, which readily combines with a wide range of Michael acceptors to produce beta-alkyl aldehydes in a highly efficient manner. Furthermore, this redox-neutral, atom-economical C-H functionalization protocol can be achieved both inter- and intramolecularly. Mechanistic studies by various spectroscopic methods suggest that a reductive quenching pathway is operable.