title: Gold-catalyzed cyclization of 1,6-diynyl dithioacetals via 1,7-carbene transfer and aromatic C-H functionalization.
abstract: A gold-catalyzed cyclization of 1,6-diynyl dithioacetals has been developed, which provides an attractive route to diverse-substituted benzo[a]fluorene derivatives. The reaction is initiated through 1,2-sulfur migration of a propargyl dithioacetal moiety to generate a vinyl gold carbene, which is followed by carbene transfer to the remaining alkyne and aromatic substitution to furnish the fused products in generally good to high yields.
authors.affiliation: State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China. yhliu@sioc.ac.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.forename: Ming
authors.initials: M
authors.lastname: Chen
authors.forename: Ning
authors.initials: N
authors.lastname: Sun
authors.forename: Yuanhong
authors.initials: Y
authors.lastname: Liu