A novel phosphine-catalyzed umpolung [3 + 2]-annulative dimerization of ynones was developed to furnish functionally rich 5-alkylidene-2-cyclopentenones. In this protocol, ynone acts as both C2 and C3 synthons, which undergo [3 + 2]-annulative dimerization.
D. B. Ramachary, T. Prabhakar Reddy and A. Suresh Kumar, Org. Biomol. Chem., 2017, 15, 9785 DOI: 10.1039/C7OB02424J
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