An Expeditious Entry to 9-Azabicyclo[3.3.1]nonane N-Oxyl (ABNO): Another Highly Active Organocatalyst for Oxidation of Alcohols

A practical, three-step synthetic route to 9-azabicyclo[3.3.1]nonane N-oxyl (ABNO, 3), an unhindered, stable class of nitroxyl radical, has been developed. ABNO exhibits a highly active nature compared with TEMPO in the catalytic oxidation of alcohols to their corresponding carbonyl compounds.