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Herein, we describe the synthesis of new functionalized tricyclic and tetracyclic indole derivatives viasamarium diiodide induced ketyl cyclizations. The intermediate samarium organyls were either protonated using different proton sources or alkylated with various electrophiles in a highly diastereoselective manner. The obtained products were subjected to further transformations leading to synthetically interesting building blocks.

Graphical abstract: Highly diastereoselective samarium diiodide induced cyclizations of new 3-substituted indole derivatives

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