Cettaertalyst-Free Synthesis Of N-(1,7-Dioxotetrahydropyrazolo[1,2-A]Pyrazol-2yl) Benzamide Derivatives By 1,3-Dipolar Cycloaddition And Rearrangement

N-(1,7-Dioxotetrahydropyrazolo[1,2-a]pyrazol-2-yl)-benzamide derivatives, a novel class of compounds, were synthesized by 1,3-dipolar cycloaddition of azomethine imines with azlactones and subsequent rearrangement. The reaction can be completed rapidly under mild conditions without a catalyst.