A novel base-promoted fused β-carboline formation strategy from 2-(1H-indol-3-yl)cyclohexan-1-ones, aldehydes and ammonium salts has been developed. In this cascade reaction, ammonium salts served as a convenient nitrogen source and simultaneously played an important role in selectivity control, which can efficiently afford two different types of β-carbolines in satisfactory yields.

中文翻译：

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碱促进 2-(1H-吲哚-3-基)环己烷-1-酮、醛和铵盐形成稠合 β-咔啉

开发了一种由 2-(1 H-吲哚-3-基)环己烷-1-酮、醛和铵盐形成的新型碱促进稠合 β-咔啉形成策略。在该级联反应中，铵盐作为一种方便的氮源，同时在选择性控制中发挥了重要作用，可以有效地以令人满意的产率提供两种不同类型的β-咔啉。