Abstract
AbstractA convenient synthesis of tricyclic ketone 7 is described based on an intra‐homoacylation via a Pummerer intermediate. The indole 3, was both annelated and functionalized for the next step through its protected indoline 4 using the single reagent dimsyllithium. The produced sulfoxide 5 generated the thionium ion intermediate upon treatment with trifluoroacetic anhydride, which subsequently underwent intramolecular cyclization to ketone 6 in the presence of a Lewis acid.
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