Atom-transfer radical addition of α-iodo esters to 1-alkynyl sulfides is described. The products, 2-alkoxycarbonylmethyl-1-iodo-1-alkenyl sulfides, can be converted into γ-keto esters.
Stereoselective hydrozirconation of alkynylsulfide and regioselective synthesis of haloalkenyl sulfide via electrophile-switched halogenation of thioalkenyl zirconocene
作者:Weixin Zheng、Ya Hong、Ping Wang、Fenfen Zheng、Yanjing Zhang、Wei Wang
DOI:10.1016/j.tetlet.2013.04.122
日期:2013.7
Stereoselective preparation of alkenyl sulfide was carried out via syn-hydrozirconation of the alkynyl sulfide. Regiochemistry of halogenation of the thioalkenyl zirconocene could be switched by different halides. alpha-Chloroalkenyl sulfide or beta-haloalkenyl sulfide (Br, I) could be obtained by the treatment of NCS or NBS (NIS), respectively. Possible mechanism of halogenation of the thioalkenyl zirconocene was set up herein. (C) 2013 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Extended Pummerer Reactions of Ketene Dithioacetal Monoxides with Alkynyl Sulfides and Ynamides with an Accompanying Oxygen Rearrangement
and ynamides provided a wide variety of γ,γ‐disulfanyl‐β,γ‐unsaturated carbonyl compounds with an accompanying oxygen rearrangement. The products can be easily converted into 1,4‐dicarbonyl compounds and substituted heteroaromatics. DFT calculations and mechanistic experiments revealed a new interesting stepwise addition/oxygen rearrangement mechanism.