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    Synthesis of some novel indeno[1,2-b]quinoxalin spiro-β-lactam conjugates
    (Pergamon-Elsevier Science Ltd, 2017) Rad, Javad Ameri; Jarrahpour, Aliasghar; Ersanli, Cem Cuneyt; Atioglu, Zeliha; Akkurt, Mehmet; Turos, Edward
    This article reports the synthesis of some new spiro-beta-lactams bearing an indeno[1,2-b]quinoxaline ring system, prepared by a [2 + 2] cycloaddition of ketenes with imines derived from 11-H-indeno[1,2-b] quinoxalin-11-one. The structures of newly synthesized spiro-beta-lactams 2a-i and 3a-i were characterized by FT-IR, H-1 NMR, C-13 NMR, mass spectrometry and elemental analyses. The relative stereochemistry of spiro-beta-lactams 2a and 3a was determined unequivocally by X-ray crystallographic studies. (C) 2017 Elsevier Ltd. All rights reserved.