title: Radical cascade reaction of alkynes with N-fluoroarylsulfonimides and alcohols.
abstract: Cascade reactions initiated by radical addition to alkynes are synthetically very attractive because they enable access to highly complex molecular skeletons in only few synthetic steps under usually mild conditions. Here we report a general radical cascade reaction of alkynes, N-fluoroarylsulfonimides and alcohols, enabling the efficient synthesis of important α-amino-α-aryl ketones from readily available starting materials via a single operation. During this process, the highly regioselective nitrogen-centred radical addition to internal and terminal alkynes generating vinyl radicals and the next explicit migration of aryl group from the nitrogen source lead the following efficient desulfonylation, oxygenation, and semi-pinacol rearrangement. In addition, the semi-pinacol rearrangement precursors, α-alkyloxyl-α,α-diaryl imines, could also be efficiently obtained under milder conditions. This methodology might open a new entry for designing intermolecular radical cascade reaction of alkynes.
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Guangfan
authors.initials: G
authors.lastname: Zheng
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Jingjie
authors.initials: J
authors.lastname: Han
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Xiong
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang