Redox-Neutral Selenium-Catalysed Isomerisation of para-Hydroxamic Acids into para-Aminophenols

A selenium-catalysed para-hydroxylation of N-aryl-hydroxamic acids is reported. Mechanistically, the reaction comprises an N-O bond cleavage and consecutive selenium-induced [2,3]-rearrangement to deliver para-hydroxyaniline derivatives. The mechanism is studied through both O-18-crossover experiments as well as quantum chemical calculations. This redox-neutral transformation provides an unconventional synthetic approach to para-aminophenols.

Automated summary

A selenium-catalysed para-hydroxylation of N-aryl-hydroxamic acids is reported in this study. The mechanism involves N-O bond cleavage and selenium-induced [2,3]-rearrangement to deliver para-hydroxyaniline derivatives. This redox-neutral transformation provides a new synthetic approach to para-aminophenols.