title: Gold-catalyzed formation of pyrrolo- and indolo-oxazin-1-one derivatives: The key structure of some marine natural products.
abstract: Various N-propargylpyrrole and indolecarboxylic acids were efficiently converted into 3,4-dihydropyrrolo- and indolo-oxazin-1-one derivatives by a gold(III)-catalyzed cyclization reaction. Some of the products underwent TFA-catalyzed double bond isomerization and some did not. Cyclization reactions in the presence of alcohol catalyzed by Au(I) resulted in the formation of hemiacetals after cascade reactions.
authors.affiliation: Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800.
authors.forename: Sultan
authors.initials: S
authors.lastname: Taskaya
authors.affiliation: Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800 ; Yüzüncü Yil University, Faculty of Pharmacy, Van, Turkey, 65100.
authors.forename: Nurettin
authors.initials: N
authors.lastname: Menges
authors.affiliation: Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800.
authors.forename: Metin
authors.initials: M
authors.lastname: Balci
keywords: alkyne cyclization; gold-catalyzed reaction; indolo-oxazin-1-one; marine natural products; pyrrolo-oxazin-1-one