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The reaction of 2-azanorbornan-3-yl methanols under Mitsunobu or mesylation conditions with various nucleophiles led to a series of chiral-bridged azepanes with configuration at C-4 dependent on the configuration of the starting alcohol. High yielding, stereoselective ring expansion to novel 2-azabicyclo[3.2.1]octane system occurred via aziridinium intermediates, which were specifically opened by nucleophilic attack at the more substituted carbon.
Institute of Physical and Theoretical Chemistry, Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland