title: PtCl4-catalyzed skeleton rearrangement-cyclization of tertiary indolyl-3-alkynols.
abstract: An unexpected PtCl4-catalyzed cyclization reaction of tertiary indol-2-yl-3-alkynols occurred smoothly in toluene to form various poly-substituted carbazole derivatives efficiently. A possible mechanism involving the formation of a spiro-tricyclic intermediate via indole C-2 attack, highly selective ring expansion and then 1,2-migration has been proposed for the formation of carbazoles.
authors.affiliation: Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People's Republic of China. masm@sioc.ac.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.forename: Youai
authors.initials: Y
authors.lastname: Qiu
authors.forename: Junzhao
authors.initials: J
authors.lastname: Li
authors.forename: Chunling
authors.initials: C
authors.lastname: Fu
authors.forename: Xue
authors.initials: X
authors.lastname: Zhang
authors.forename: Shengming
authors.initials: S
authors.lastname: Ma