Sankar K. Guchhait, Chetna Madaan. An Efficient, Regioselective, Versatile Synthesis of N-Fused 2- and 3-Aminoimidazoles via Ugi-Type Multicomponent Reaction Mediated by Zirconium(IV) Chloride in Polyethylene Glycol-400.
Synlett, 2009, 4, p. 628-632.
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http://dx.doi.org/10.1055/s-0028-1087915