Photoredox/Pyridine N-oxide Catalyzed Carbohydroxylation and Aminohydroxylation of α-Olefins.

Anti-Markovnikov carbohydroxylation and aminohydroxylation of α-olefins were developed in this research by photore-dox catalyst and pyridine N-oxide. This approach offers the catalytic and direct conversion of unactivated alkenes to a series of primary alcohols including the ones bearing β-quaternary carbon centers and β-amino alcohols. The anti-Markovnikov selective transformation is enabled by the radical addition of α-olefin from pyridine N-oxy radical, which is generated from readily available pyridine N-oxide via photoredox catalyzed single-electron oxidation. Mechanistic stud-ies reveal that the reaction might occur with an N-alkoxypyridinium intermediate and following nucleophilic substitu-tion. The implications of this method for anti-Markovnikov addition of α-olefins were further demonstrated by the exam-ples of carboetherification, carboesterification, and lactone formation.