A copper-catalyzed cascade radical 1,2-cyclization of indoles with arylsulfonyl hydrazides was developed, affording a series of 2-thiolated 3H-pyrrolo[1,2-a]indoles in moderate to excellent yields. This transformation proceeded with sequential radical addition to a triple bond and a cyclization procedure, where arylsulfonyl hydrazides served as thioarylation reagents.

中文翻译：

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铜催化的芳基磺酰肼与吲哚的自由基1,2-环化反应：获得2-硫代3 H-吡咯并[1,2- a ]吲哚

开发了铜催化的芳基磺酰肼与吲哚的级联1，2-环化反应，以中等至极好的收率得到了一系列2-硫代3 H-吡咯并[1,2- a ]吲哚。该转化过程是依次将自由基加成至三键和环化程序，其中芳基磺酰肼用作硫代芳基化试剂。