A New Co<sub>2</sub>(CO)<sub>8</sub>-Mediated Tandem [5 + 1]/[2 + 2 + 1]-Cycloaddition Reaction: A One-Pot Synthesis of Tricyclic δ-Lactones from <i>cis</i>-Epoxy Ene-ynes
作者:Arjan Odedra、Chang-Jung Wu、Reniguntala J. Madhushaw、Su-Lein Wang、Rai-Shung Liu
DOI:10.1021/ja0346633
日期:2003.8.1
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.