Acta Cryst. (2012). E68, o126 [ doi:10.1107/S1600536811052962 ]
Abstract: The title compound, C12H11BrN2O2, was prepared by an intra-cyclization reaction of (S)-1-(5-bromo-2-nitrobenzyl)-5-oxopyrrolidine-2-carboxylic acid methyl ester in the presence of EtOH/Fe. The five-membered pyrrolidinone ring adopts an approximate envelope conformation, while the seven-membered diazepanone ring displays a twisted boat conformation. Intermolecular classical N-HO hydrogen bonds and weak C-HO interactions help to stabilize the crystal structure.
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