Abstract:
5,6-Diaryl-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazolium tetrafluoroborates (hexafluorophosphate) were unexpectedly synthesized along with expected 1,3-diaryl-2-nitrotetrahydro-1H,5H-pyrazolo[1,2-a]pyrazoles, under the action of 1-nitro-2-(3-nitrophenyl)-ethylene on 6-aryl-1,5-diazabicyclo[3.1.0]hexanes in ionic liquids with the Et2O·BF3 catalyst, whereas the same reaction with unsubstituted β-nitrostyrene produced only 1,3-diaryl-2-nitrotetrahydro-1H,5H-pyrazolo[1,2-a]pyrazole derivatives.
Citation:
Yu. S. Syroeshkina, V. V. Kachala, I. V. Ovchinnikov, V. V. Kuznetsov, Yu. V. Nelyubina, K. A. Lyssenko, N. N. Makhova, “Ionic-liquids-assisted reaction of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes with β-nitrostyrenes”, Mendeleev Commun., 19:5 (2009), 276–278
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https://www.mathnet.ru/eng/mendc3198
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