title: Lewis acid promoted cyclization of enyne triesters and diesters.
abstract: Reactions of enynes with three or two ester groups (1-4) in the presence of halogen-ligand Lewis acids gave cyclized products with halide incorporation (5-8) with high generality. The cyclization process was also analyzed in a theoretical study. Facile isomerization and dehydrohalogenation of five-membered products 5 and 8 by Al(2)O(3) or Et(3)N were also observed; this process introduces conjugated moieties into the products.
authors.affiliation: Department of Chemistry, Nara University of Education, Japan. yamazaks@nara-edu.ac.jp
authors.forename: Shoko
authors.initials: S
authors.lastname: Yamazaki
authors.forename: Kuriko
authors.initials: K
authors.lastname: Yamada
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yamabe
authors.forename: Kagetoshi
authors.initials: K
authors.lastname: Yamamoto