title: Synthesis of the tetracyclic core of the kempanes by a ring-closing metathesis strategy.
abstract: [reaction: see text] The synthesis of the tetracyclic ring system of the kempane diterpenes was achieved through the highly regio- and stereoselective Diels-Alder reaction of an isopropenyl-diene with 2,6-dimethyl-p-benzoquinone, addition of an allyl group, and ring-closing metathesis of the isopropenyl and allyl groups.
authors.affiliation: Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhao
authors.forename: D Jean
authors.initials: DJ
authors.lastname: Burnell