title: (11aS)-7-Bromo-2,3,5,10,11,11a-hexa-hydro-1H-pyrrolo-[2,1-c][1,4]benzodiazepine-3,11-dione.
abstract: The title compound, C(12)H(11)BrN(2)O(2), was prepared by an intra-cyclization reaction of (S)-1-(5-bromo-2-nitro-benz-yl)-5-oxopyrrolidine-2-carb-oxy-lic 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. Inter-molecular classical N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions help to stabilize the crystal structure.
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
authors.forename: Zhen-Zhong
authors.initials: ZZ
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Pan
authors.forename: Yu
authors.initials: Y
authors.lastname: Tian
authors.forename: Wei
authors.initials: W
authors.lastname: Xiao