We present here a convenient synthesis of the dibenzo[a,c]carbazoles via oxidative [4+2] Diels−Alder cycloaddition of 2‐phenyl‐1H‐indoles with benzynes. The features of this protocol include the use of readily available raw materials, molecular oxygen as the oxidant, it being free of transition‐metal‐catalyst, and convenient method for the preparation of π‐extended dibenzo[a,c]carbazoles.

中文翻译：

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通过 2-苯基-1H-吲哚和苄炔的氧化 Diels-Alder 反应构建二苯并[a，c]咔唑


我们在这里介绍了一种通过2-苯基-1H-吲哚与苄的氧化[4+2] Diels-Alder环加成反应方便地合成二苯并[a，c]咔唑。该方案的特点包括使用现成的原材料，分子氧作为氧化剂，它不含过渡金属催化剂，以及制备π延伸二苯并[a，c]咔唑的便捷方法。