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A general protocol for preparing densely functionalized cyclopentenones through a tandem nucleophilic addition–deprotonation–alkylation–cyclization process is described. Addition of lithioallene 2 to enamides 1 generates tetrahedral intermediate 3. Deprotonation of the γ carbon atom of the allene function in situ, followed by trapping by a suitable electrophile and cyclization during workup leads...
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