Crystal structure of ethyl (2S,2′ R)-1′-benzyl-3-oxo-3H-dispiro[1-benzothio-phene-2,3′-pyrrolidine-2′,11″-indeno-[1,2-b]quinoxaline]-4′-carboxylate

J. Govindaraj, R Raja, M Suresh, R. Raghunathan, A. SubbiahPandi, William Thomas Alexander Harrison (Editor)

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In the title compound, C35H27N3O3S, the spiro-linked five-membered rings both adopt twisted conformations. The pyrrolidine ring makes dihedral angles of 80.5 (1) and 77.4 (9)° with the benzothiophene ring system and the quinoxaline ring system, respectively. The S atom and C=O unit of the benzothiophene ring system are disordered over two opposite orientations in a 0.768 (4):0.232 (4) ratio. The atoms of the ethyl side chain are disordered over two sets of sites in a 0.680 (16):0.320 (16) ratio. In the crystal, molecules are linked by C - H⋯O, C - H⋯N and π-π interactions [shortest centroid-centroid distance = 3.4145 (19) Å], resulting in a three-dimensional network.
Original languageEnglish
Pages (from-to)o195-o196
Number of pages2
JournalActa Crystallographica Section E: Structure Reports Online
Issue number3
Early online date21 Feb 2015
Publication statusPublished - 1 Mar 2015

Bibliographical note

The authors thank the TBI X-ray facility, CAS in Crystallography and BioPhysics, University of Madras, Chennai, India, for the data collection.


  • Benzothiophene
  • Biological activity
  • Crystal structure
  • Dispiro compounds
  • Ester
  • Hydrogen bonding
  • Indeno[1,2-b]quinoxaline
  • Pyrrolidine
  • π-πinteractions


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