A novel approach to the synthesis of 3,4-dicarbonyl-substituted pyrazoles from a wide range of 1,3-dicarbonyl compounds and oxamic acid thiohydrazides was developed via iodine-promoted cascade imination/halogenation/cyclization/ring contraction reaction accompanied by sulfur elimination. This procedure provides a highly efficient and facile route to functionalized pyrazoles from readily available substrates under mild reaction conditions.

中文翻译：

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碘促进的由1,3-二羰基化合物和草酰胺酸硫酰肼合成吡唑

通过碘促进的级联亚胺化/卤化/环化/环缩合反应并伴随脱硫反应，开发了一种由多种1,3-二羰基化合物和草氨酸硫酰肼合成3,4-二羰基取代的吡唑的新方法。。该程序提供了在温和的反应条件下从易于获得的底物制备官能化吡唑的高效便捷途径。