nickel-catalyzed oxidative dehydrogenative coupling reaction of alkane with thiol for the construction of C(sp3)-S bond has been established, affording more than 50 alkyl thioethers. Notably, pharmaceutical and agrochemicals, such as Provigil, Chlorbenside and Pyridaben, were readily synthesized by this approach. The sterically hindered ligand BC and disulfide which was formed in situ oxidation of thiol, efficiently
(PhCH<sub>2</sub>PPh<sub>3</sub>)<sup>+</sup>Br<sub>3</sub> <sup>−</sup>: A Versatile Reagent for the Chemoselective Oxidation of Sulfides to Sulfoxides
作者:F. Shirini、G. H. Imanzadeh、A. R. Mousazadeh、A. R. Aliakbar
DOI:10.1080/10426500903176539
日期:2010.7.30
Benzyltriphenylphosphonium tribromide (BTPTB), as a stable solid reagent, is easily prepared by the reaction of benzyltriphenylphosphonium bromide with Br2. This reagent can be used as an efficient reagent for the chemoselective oxidation of dialkyl and aryl-alkyl sulfides to their corresponding sulfoxides in the presence of diaryl sulfides and primary alcohols. All reactions were performed in a refluxing
作者:Chen Li、Xian Chen、Rui-Peng Bao、Dong-Li Li、Kun Zhang、Dong-Hui Wang
DOI:10.1039/c9ra06811b
日期:——
In this study, we demonstrate an Ir(III)-catalyzed thioether directedalkenylation of arene C–H bonds under mild reaction conditions. The selectivity for mono- or di-alkenylation is controlled by the concentration of alkene and oxidant loading. Various functional groups are tolerated, and moderate to good yields of alkenylated products are achieved.
在这项研究中,我们展示了在温和反应条件下Ir( III ) 催化的硫醚定向烯基化芳烃 C-H 键。单或二烯基化的选择性由烯烃浓度和氧化剂负载量控制。可耐受各种官能团,并获得中等至良好的烯基化产物产率。
Fe(<scp>ii</scp>)-Catalyzed alkenylation of benzylic C–H bonds with diazo compounds
作者:Jiang-Ling Shi、Qinyu Luo、Weizhi Yu、Bo Wang、Zhang-Jie Shi、Jianbo Wang
DOI:10.1039/c9cc01060b
日期:——
We report herein an alkenylation of benzylic C(sp3)–H bonds with diazocompounds via carbon cation intermediates with DDQ as the oxidant in the presence of a catalytic amount of Fe(II). Diphenylmethane, toluene, benzyl methyl sulfide and their derivatives could be applied as substrates to afford the tetra-substituted olefin products, which may serve as useful building blocks in organic synthesis.
Selective Oxidation of Sulfides to Sulfoxides and Sulfones Using<b><i>n</i></b>-Butyltriphenylphosphonium Dichromate (Bu<sup><i>n</i></sup>PPh<sub>3</sub>)<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>in the Presence of Aluminium Chloride in Solution and Under Microwave Irradiation
sulfones in excellent yields using n-butyltriphenylphosphonium dichromate (BTPPDC) in the presence of aluminium chloride in acetonitrile solution and under microwave irradiation. In addition, selective oxidation of sulfides in the presence of functional groups such as a carbon–carbon double bond, ketone, oxime, aldehyde, ether, and acetal can be considered as a noteworthy advantage of this method.