title: Synthesis of 4,5-benzotropones by cyclization of 1,3-bis-silyl enol ethers with 1,2-dialdehydes.
abstract: The cyclization of 1,3-bis-silyl enol ethers or (2,4-dioxobutylidene)triphenylphosphoranes with phthalic dialdehyde allowed a convenient synthesis of a variety of 4,5-benzotropones. The hydrogenation of benzotropones afforded functionalized benzocycloheptanones which were transformed into tricyclic butenolides.
authors.affiliation: Institut für Chemie und Biochemie der Ernst-Moritz-Arndt Universität Greifswald, Soldmannstr. 16, D-17487 Greifswald, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Albrecht
authors.forename: Thi Hong Van
authors.initials: TH
authors.lastname: Nguyen
authors.forename: Peter
authors.initials: P
authors.lastname: Langer