An efficient synthesis of novel dinitrogen-fused heterocycles, such as pyrazolo[1,2-a]cinnoline derivatives, has been accomplished by the rhodium(III)-catalyzed reaction of N-arylpyrazol-5-ones with diazo compounds. This reaction proceeds through a cascade C−H activation/intramolecular cyclization under mild reaction conditions and features a broad substrate scope.

中文翻译：

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铑催化的 [4+2] N-芳基吡唑啉酮与重氮化合物的环化以获得吡唑啉酮稠合的肉啉

新型二氮稠合杂环的有效合成，例如吡唑并[1,2- a ]肉啉衍生物，已通过铑(III)催化的N-芳基吡唑-5-酮与重氮化合物的反应完成。该反应在温和的反应条件下通过级联 CH 活化/分子内环化进行，具有广泛的底物范围。