Preparation and benzoylation of 3-hydroxy-2,3,5,5-tetramethyl-1-pyrroline 1-oxide (3-hydroxy-2,3,5,5-tetramethyl-4,5-dihydro-3H-pyrrole 1-oxide)
Abstract
Treatment of 2,3,5,5-tetramethyl-3-hydroxy-1-pyrroline 1-oxide 6, prepared from butanone in six steps, with benzoyl chloride under Schotten–Baumann conditions leads to an unprecedented dimerisation to give a spiro, tricyclic N-benzoyloxypyrrolidine in good yield.