title: Cycloaddition-Fragmentation as a Route to Bicyclic Ring Systems. Use of the Intermolecular Diyl Trapping Reaction.
abstract: A route to bicyclo[n.3.0] ring systems (n = 5-7) has been devised. Key transformations include an intermolecular diyl trapping reaction (1 + 3 --> 4), and fragmentation of the resulting tricyclic cycloadduct 4 (4 --> 5). A variety of diylophiles were examined, including electron deficient (6, 7, 21, 29, 30, 31), electron rich (8), and push-pull cycloalkenes (9, 10, 19, 20).
authors.affiliation: Department of Chemistry, University of California-Santa Barbara, Santa Barbara, California 93106.
authors.forename: Joseph A.
authors.initials: JA
authors.lastname: Leonetti
authors.forename: Tim
authors.initials: T
authors.lastname: Gross
authors.forename: R. Daniel
authors.initials: RD
authors.lastname: Little