Acta Cryst. (2012). E68, o126  [ doi:10.1107/S1600536811052962 ]

(11aS)-7-Bromo-2,3,5,10,11,11a-hexahydro-1H-pyrrolo[2,1-c][1,4]benzodiazepine-3,11-dione

C. Ma, Z.-Z. Wang, L. Pan, Y. Tian and W. Xiao

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.

Online 14 December 2011

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