General Synthesis of Alkenyl Sulfides by Palladium-Catalyzed Thioetherification of Alkenyl Halides and Tosylates
作者:Noelia Velasco、Cintia Virumbrales、Roberto Sanz、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez
DOI:10.1021/acs.orglett.8b00854
日期:2018.5.18
ligand is reported. These reactions occur under low catalyst loading and in high yields and display widescope, including the coupling of bulky thiols and trisubstituted bromoolefins, and functional group tolerance. In addition, the thioetherification of less reactive chloroalkenes and, for the first time, alkenyl tosylates was accomplished using a catalyst generated from CyPFtBu alkylbisphosphine ligand
据报道,链烯基溴化物与硫醇的交联反应是由廉价dppf配体衍生的钯配合物催化的。这些反应在低催化剂负载和高收率下发生,并显示出较宽的范围,包括大体积硫醇和三取代溴代烯烃的偶联以及官能团的耐受性。另外,使用由CyPF t Bu烷基双膦配体产生的催化剂实现了反应性较低的氯代烯烃的硫醚化以及首次甲苯基甲苯磺酸酯的硫醚化。
Studies on the 1,2-Migrations in Pd-Catalyzed Negishi Couplings with JosiPhos Ligands
作者:Anders T. Lindhardt、Thomas M. Gøgsig、Troels Skrydstrup
DOI:10.1021/jo801824e
日期:2009.1.2
cross-coupling, which is promoted by palladium catalyst systems generated with JosiPhos ligands. Several of the factors that were demonstrated to be important for the 1,2-migration include (1) the nucleophilicity of the organometallic reagent, which possibly influences the transmetalation step in direct competition with the intermediate β-hydride elimination of the alkenyl Pd(II) species; (2) the structural
Heck Coupling with Nonactivated Alkenyl Tosylates and Phosphates: Examples of Effective 1,2-Migrations of the Alkenyl Palladium(II) Intermediates
作者:Anders L. Hansen、Jean-Philippe Ebran、Mårten Ahlquist、Per-Ola Norrby、Troels Skrydstrup
DOI:10.1002/anie.200600442
日期:2006.5.12
Photoinduced rearrangement of vinyl tosylates to β-ketosulfones
作者:Lili Xie、Xiaomeng Zhen、Shuping Huang、Xiaolong Su、Mai Lin、Yi Li
DOI:10.1039/c7gc01467h
日期:——
We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of -ketosulfones. The process is based on photoinitiated homolysis of vinyl tosylate to release sulfinyl radical from the tosyl group of and subsequent addition of sulfinyl radical to another vinyl tosylate form the desired -ketosulfones. This simple protocol features board scope