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.
N. J. Gibson, A. R. Forrester and C. Brown, J. Chem. Soc., Perkin Trans. 1, 1995, 507 DOI: 10.1039/P19950000507
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