As the starting compounds in the synthesis of pyrazino [l, 2-a] indoles we used the previous unknown monoarylhydrazones (Va-f) of dicarbonyl compounds, which were obtained from methyl propyl ketone (Via), methyl butyl ketone (VIb), and dipropyl ketone (VIc) by the method described in [6], as well as the previously synthesized [7] l-phenylbutane-2, 3-dione 2-(pnitrophenylhydrazone)(Vg).
[Grinev, A. N.; Krichevskii, E. S.; Romanova, O. B.; Ermakov, A. I.; Sokolov, I. K.; Mashkovskii, M. D. Pharmaceutical Chemistry Journal, 1983 , vol. 17, # 11 p. 773 - 776 Khimiko-Farmatsevticheskii Zhurnal, 1983 , vol. 17, # 11 p. 1300 - 1304]
[Grinev, A. N.; Krichevskii, E. S.; Romanova, O. B.; Ermakov, A. I.; Sokolov, I. K.; Mashkovskii, M. D. Pharmaceutical Chemistry Journal, 1983 , vol. 17, # 11 p. 773 - 776 Khimiko-Farmatsevticheskii Zhurnal, 1983 , vol. 17, # 11 p. 1300 - 1304]