Based on an aza-alkylation/Michael addition cascade reaction developed by Kim and co-workers we have developed divergent cascade reactions leading to either highly substituted 1-hydroxycarbazoles, 3-hydroxycarbazoles or β-carbolines, starting from readily accessible ortho-arylsulfonylaminobenzaldehydes. Olefination of the aldehyde functionality by aldol condensation or Wittig olefination gave reactive enone intermediates, which underwent the cascade reactions, either in two steps or in one-pot conversions, to give hydroxycarbazoles or complex β-carbolines.

中文翻译：

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通过原位生成的二酮吲哚快速取代高度取代的咔唑和β-咔啉的方法

基于Kim和他的同事开发的氮杂烷基化/迈克尔加成级联反应，我们开发了不同的级联反应，从容易获得的邻芳基磺酰基氨基苯甲醛开始，导致了高度取代的1-羟基咔唑，3-羟基咔唑或β-咔啉。通过醛醇缩合或维蒂希（Wittig）烯化反应对醛官能度进行烯烃化，得到反应性烯酮中间体，该中间体以两步或一锅转化进行级联反应，得到羟基咔唑或复杂的β-咔啉。