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。
A Three-Component Strategy for Benzoselenophene Synthesis under Metal-Free Conditions Using Selenium Powder
作者:Penghui Ni、Jing Tan、Wenqi Zhao、Huawen Huang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1021/acs.orglett.9b00739
日期:2019.5.17
An efficient three-component benzoselenophenes formation has been developed from substituted indoles, acetophenones, and selenium powder under metal-free conditions. 2-Aryl indoles played an important role to promote benzoselenophene formation from acetophenone derivatives and selenium powder. One C–C and two C–Se bonds were selectively formed to provide 40 new benzoselenophenes in good yields.
Highly enantioselective electrosynthesis of C2-quaternary indolin-3-ones
作者:Fo-Yun Lu、Yu-Jue Chen、Yuan Chen、Xuan Ding、Zhi Guan、Yan-Hong He
DOI:10.1039/c9cc09178e
日期:——
An asymmetric electrosynthesis is developed by combining anodic oxidation and proline-catalysis to realize enantioselective synthesis of C2-quaternary indolin-3-ones from 2-arylindoles.
A new chiral Brønsted acid, generated in situ from a chiral phosphoric acid boron (CPAB) complex and water, was successfully applied to asymmetric indole reduction. This "designer acid catalyst", which is more acidic than TsOH as suggested by DFT calculations, allows the unprecedented direct asymmetricreduction of C2-aryl-substituted N-unprotected indoles and features good to excellent enantioselectivities
A rhodium(III)-catalyzed indole-directed arylC–H bond carbenoid insertion cascade of 2-arylindoles with diazo compounds has been developed. This method provides a rapid access to 1,2-benzocarbazoles and isoquinoline-based polycyclic heteroaromatics with a broad range of functional group tolerance. The primary evaluation of the photoluminescence property of the novel extended π-systems indicated that