Photocatalytic Oxidative C–H Thiolation: Synthesis of Benzothiazoles and Sulfenylated Indoles
作者:Andrew N. Dinh、Ashley D. Nguyen、Ernesto Millan Aceves、Samuel T. Albright、Mario R. Cedano、Diane K. Smith、Jeffrey L. Gustafson
DOI:10.1055/s-0039-1690107
日期:2019.9
sulfenylated indoles via an intermolecular reaction. Cyclic voltammetry (CV) and density functional theory studies suggest that benzothiazole formation proceeds via a mechanism that involves an electrophilic sulfur radical, while the indole sulfenylation likely proceeds via a nucleophilic sulfur radical adding into a radical cationic indole. These conditions were successfully extended to several thiobenzamides
Photocatalytic direct C–S bond formation: facile access to 3-sulfenylindoles via metal-free C-3 sulfenylation of indoles with thiophenols
作者:Wei Guo、Wen Tan、Mingming Zhao、Kailiang Tao、Lv-Yin Zheng、Yongquan Wu、Deliang Chen、Xiao-Lin Fan
DOI:10.1039/c7ra08086g
日期:——
An efficient and convenient photocatalytic direct C-3 sulfenylation of indoles with thiophenols has been developed for the construction of 3-sulfenylations. This protocol employs thiophenols as the sulfenylating agents, inexpensive rose bengal as the photocatalyst, and shows mild conditions, readily available starting materials, high atom and step atom economy, and environmental advantages. The representative
Synthesis of 3-Sulfenyl- and 3-Selenylindoles by the Pd/Cu-Catalyzed Coupling of <i>N</i>,<i>N</i>-Dialkyl-2-iodoanilines and Terminal Alkynes, Followed by <i>n</i>-Bu<sub>4</sub>NI-Induced Electrophilic Cyclization
作者:Yu Chen、Chul-Hee Cho、Feng Shi、Richard C. Larock
DOI:10.1021/jo9014003
日期:2009.9.4
palladium/copper-catalyzed crossing coupling of N,N-dialkyl-ortho-iodoanilines and terminalalkynes and subsequent electrophilic cyclization of the resulting N,N-dialkyl-ortho-(1-alkynyl)anilines with arylsulfenyl chlorides or arylselenyl chlorides. The presence of a stoichiometric amount of n-Bu4NI is crucial to the success of the electrophilic cyclization. A variety of 3-sulfenyl- and 3-selenylindole derivatives
3-亚硫基-和 3-硒基吲哚可通过两步法合成,包括钯/铜催化的N , N - 二烷基-邻 -碘苯胺和末端炔烃的交叉偶联以及随后所得N , N - 的亲电环化二烷基-邻-(1-炔基)苯胺与芳基硫基氯或芳基硒基氯。存在化学计量的n -Bu 4NI 对于亲电环化的成功至关重要。各种带有烷基、乙烯基、芳基和杂芳基取代基的 3-亚苯基和 3-硒基吲哚衍生物已经以良好到极好的产率(高达 99%)制备。通过使用N,N-二苄基-邻-碘苯胺,已成功制备了3-硫基-N - H-吲哚。此外,3-磺酰基-和3-亚磺酰基吲哚也已通过相应的3-亚磺酰基吲哚的轻松氧化成功制备。
Iron-Facilitated Iodine-Mediated Electrophilic Annulation of N,N-Dimethyl-2-alkynylanilines with Disulfides or Diselenides
synthesis of N-methyl-3-chalcogeno-indoles has been developed via iodine-mediatedelectrophilicannulation reactions of 2-alkynylaniline derivatives with disulfides or diselenides. In the presence of iodine and iron, a variety of 2-alkynylanilines selectively underwent the electrophilicannulation with numerous disulfides or diselenides leading to the corresponding 3-sulfenylindoles and 3-selenenylindoles