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An approach to hydrocarbazoles bearing an all‐carbon quaternary center at C4a position was developed via a Brønsted acid‐initiated Diels‐Alder cycloaddition/retro‐aza‐Michael addition cascade process from azepino[4,5‐b]indoles and commercially available dienophiles. The method provided a range of hydrocarbazoles in 63–99% yields. The practicality of this transformation was demonstrated by a scale‐up...
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