title: Rhodium-catalyzed tandem annulation and (5 + 1) cycloaddition: 3-hydroxy-1,4-enyne as the 5-carbon component.
abstract: A Rh-catalyzed tandem annulation and (5 + 1) cycloaddition was realized. 3-Hydroxy-1,4-enyne served as the new 5-carbon component for the (5 + 1) cycloaddition. Substituted carbazoles, dibenzofurans, and tricyclic compounds containing a cyclohexadienone moiety could be prepared efficiently. The identification of a byproduct suggests that metal carbene and ketene intermediates may be involved in the (5 + 1) cycloaddition.
authors.affiliation: School of Pharmacy, University of Wisconsin , Madison, Wisconsin 53705, United States.
authors.forename: Xiaoxun
authors.initials: X
authors.lastname: Li
authors.forename: Wangze
authors.initials: W
authors.lastname: Song
authors.forename: Weiping
authors.initials: W
authors.lastname: Tang
mesh_terms: D001572:Benzofurans / Q000138:chemical synthesis* / Q000737:chemistry; D002227:Carbazoles / Q000138:chemical synthesis* / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D061565:Cycloaddition Reaction; D053138:Cyclohexenes / Q000138:chemical synthesis* / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry*
chemical_list: D001572:Benzofurans; D002227:Carbazoles; D053138:Cyclohexenes; C507608:cyclohexadienone; D002244:Carbon; C023614:dibenzofuran; D012238:Rhodium