Nickel-catalyzed 〔4 + 2 + 2〕-type annulation reaction of cyclobutanones with diynes and enynes

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  • Nickel catalyzed 4 2 2 type annulation reaction of cyclobutanones with diynes and enynes

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<jats:title>Abstract</jats:title> <jats:p>In the presence of a nickel(0) catalyst, cyclobutanones reacted with diynes to produce bicyclic eight-membered ring ketones. Cyclobutanones acted as a C4 unit in the formal [4+2+2]-type annulation reaction, which proceeded through a ring-expansion of a spirocyclic seven-membered oxanickelacycle to a nine-membered nickelacycle via β-carbon elimination. A similar annulation reaction was also examined with enynes.</jats:p>

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