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Cobalt-Catalyzed Regio- and Diastereoselective Formal [3 + 2] Cycloaddition between Cyclopropanols and Allenes

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journal contribution
posted on 30.01.2019, 00:00 by Junfeng Yang, Qiao Sun, Naohiko Yoshikai
A cobalt–diphosphine catalyst has been found to promote a formal [3 + 2] cycloaddition reaction between a cyclopropanol and an allene via cyclopropanol ring opening, which affords a 3-alkylidenecyclopentanol derivative with high regio- and diastereoselectivities. The reaction tolerates monosubstituted, 1,1-disubstituted, and 1,3-disubstituted allenes and various functional groups. The reaction is proposed to proceed through carbometalation of the allene with a cobalt homoenolate followed by intramolecular carbonyl allylation of the resulting allylcobalt species.