Acta Cryst. (2005). E61, o629-o631 [ doi:10.1107/S1600536805003880 ]
Abstract: The title compound, C27H39N3O9, is a key intermediate in the synthesis of novel -turn mimetics based on electrophilic amination of enantiomerically pure (S)-pyroglutamic acid. The molecule adopts an extended conformation which is not stabilized by either intra- or intermolecular hydrogen bonding. The pyrrolidine five-membered ring adopts an envelope conformation, with the unsubstituted C atom situated at the flap and the other four atoms almost coplanar.
Online 12 February 2005
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