Sundberg indole synthesis carbazoles

Scheme 8 The Cadogan-Sundberg Indole Synthesis Applied to Carbazoles...

As with several indole-ring syntheses to be discussed, transition metals have been adapted to the Sundberg azide indole-carbazole synthesis. These include rhodium, ruthenium, palladium, and iron. Rather than discuss these elegant methods in the present chapter, 1 have relegated them to the respective chapters on metal-promoted indole synthesis. Two excellent reviews discuss the synthesis of nitrogen heterocycles via azides [59] and nitrenes [60]. 

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