title: A new Co(2)(CO8-mediated tandem [5 + 1]/[2 + 2 + 1]-cycloaddition reaction: a one-pot synthesis of tricyclic delta-lactones from cis-epoxy ene-ynes.
abstract: In the presence of Co2(CO)8 and CO, cis-epoxyalkynes bearing a tether olefin undergo a tandem [5 + 1]/[2 + 2 + 1]-cycloaddition to give tricyclic delta-lactones efficiently in a one-pot operation. The reaction mechanism is proposed to involve a cobalt-coordinated cyclic allene species.
authors.affiliation: Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan, ROC.
authors.forename: Arjan
authors.initials: A
authors.lastname: Odedra
authors.forename: Chang-Jung
authors.initials: CJ
authors.lastname: Wu
authors.forename: Reniguntala J
authors.initials: RJ
authors.lastname: Madhushaw
authors.forename: Su-Lein
authors.initials: SL
authors.lastname: Wang
authors.forename: Rai-Shung
authors.initials: RS
authors.lastname: Liu