B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Electron Donor–Acceptor Complex-Mediated Aerobic Sulfenylation of Indoles under Visible-Light Conditions
efficient B(C6F5)3-catalyzed aerobic oxidative C–S cross-coupling reaction of thiophenol with indoles was developed, affording a wide range of diaryl sulfides in good yields. An electron donor–acceptor complex between B(C6F5)3 and indoles was formed, facilitating the photoinduced single-electron transfer (SET) from indole substrates to the B(C6F5)3catalyst. This protocol demonstrates a new reaction model
开发了一种高效的 B(C 6 F 5 ) 3催化的苯硫酚与吲哚的有氧氧化 C-S 交叉偶联反应,以良好的收率提供了范围广泛的二芳基硫化物。B(C 6 F 5 ) 3和吲哚之间形成了电子供体-受体复合物,促进了从吲哚底物到B(C 6 F 5 ) 3催化剂的光诱导单电子转移(SET) 。该协议展示了使用 B(C 6 F 5 ) 3作为单电子氧化剂的新反应模型。
Palladium-Catalyzed Annulation of 2-(1-Alkynyl)benzenamines with Disulfides: Synthesis of 3-Sulfenylindoles
3-Sulfenylindoles can be efficiently prepared in moderate to good yields from 2-(1-alkynyl)benzenamines and disulfides using the palladium/air catalytic systems. The study also provides a useful route to the synthesis of fipronil analogues.
C S and C N bond formation via Mn-promoted oxidative cascade reaction: Synthesis of C3-sulfenated indoles
作者:Lin He、Xianwei Li
DOI:10.1016/j.tet.2017.09.003
日期:2017.10
Thioethers are of synthetic value in pharmaceutical molecules and nature products, herein, we report an oxidative cascade reaction that delivers multiple substituted indole thioethers with great efficiency. This transformation utilized ortho-azido aromatic alkynes as the substrates, and sulfonyl hydrazides as the sulfenation reagent promoted by Mn(III) catalyst. Notably, great functional group tolerance
A novel and efficient palladium-catalyzed cascade annulation/arylthiolation reaction has been developed to afford functionalized 3-sulfenylbenzofuran and 3-sulfenylindole derivatives in moderate to good yields from readily available 2-alkynylphenols and 2-alkynylamines in ionic liquids. This protocol provides a valuable synthetic tool for the assembly of a wide range of 3-sulfenylbenzofuran and 3-sulfenylindole
Microwave assisted metal-/oxidant-free cascade electrophilic sulfenylation/5-endo-dig cyclization of 2-alkynylanilines to generate diversified 3-sulfenylindoles
作者:Shivani Sharma、Ramdas S. Pathare、Sukanya、Antim K. Maurya、Bhagyashree Goswami、Vijai K. Agnihotri、Devesh M. Sawant、Ram T. Pardasani
DOI:10.1016/j.tetlet.2017.08.046
日期:2017.10
A metal-/oxidant-free sustainable protocol for the synthesis of 3-sulfenylindoles based on electrophilic cyclization of 2-alkynylanilines has been developed under microwave irradiation. Herein, catalytic amount of iodine and stoichiometric amount of sulfonyl hydrazides were employed as catalyst and electrophiles respectively to induce the 5-endo-dig cyclization of 2-alkynylanilines. This strategy allows a wide substrate scope, demonstrates good functional group tolerance, utilizes easily available reagents and overcome multistep synthesis. (C) 2017 Elsevier Ltd. All rights reserved.