Alkyl Radical Addition to Aliphatic and Aromatic -Acylhydrazones Using an Organic Photoredox Catalyst.

Increased versatility of intermolecular radical addition to imino acceptors via photoredox catalysis is reported. Primary and secondary radicals, generated via visible-light photocatalysis from alkyl biscatecholatosilicates with organocatalyst 4CzIPN, add successfully to both aromatic and aliphatic -acylhydrazones in the presence of MgCl. With -benzoylhydrazones, a simple reductive cleavage of the N-N bond of the hydrazine adduct furnishes the free amine.