readily available N-(2-pyridyl)anilines and commercially available α-Cl ketones through iridium-catalyzed C–H activation and cyclization is reported here. As a complementary approach to the conventional strategies for indole synthesis, the transformation exhibits powerful reactivity, tolerates a large number of functional groups, and proceeds with good to excellent yields undermildconditions, providing
Direct C–H alkylation and indole formation of anilines with diazo compounds under rhodium catalysis
作者:Neeraj Kumar Mishra、Miji Choi、Hyeim Jo、Yongguk Oh、Satyasheel Sharma、Sang Hoon Han、Taejoo Jeong、Sangil Han、Seok-Yong Lee、In Su Kim
DOI:10.1039/c5cc07767b
日期:——
The rhodium(III)-catalyzed direct functionalization of aniline C-H bonds with [small alpha]-diazo compounds is described. These transformations provide the facile construction of ortho-alkylated anilines with diazo malonates or highly substituted indoles with...
Tunable Electrochemical C−N versus N−N Bond Formation of Nitrogen‐Centered Radicals Enabled by Dehydrogenative Dearomatization: Biological Applications
Herein, an environmentally friendly electrochemical approach is reported that takes advantage of the captodative effect and delocalization effect to generate nitrogen‐centered radicals (NCRs). By changing the reaction parameters of the electrode material and feedstock solubility, dearomatization enabled a selective dehydrogenative C−N versus N−Nbondformation reaction. Hence, pyrido[1,2‐a ]benzimidazole
本文报道了一种环境友好的电化学方法,该方法利用俘获作用和离域作用产生氮中心自由基(NCR)。通过改变电极材料的反应参数和原料溶解度,脱芳香化使选择性脱氢的CN与NN键形成反应成为可能。因此,吡啶[1,2- a ]苯并咪唑和四芳基肼构架是通过具有广泛普遍性的可持续的无过渡金属和外源氧化剂的策略制备的。生物活性测定表明,吡啶并[1,2- a ]苯并咪唑类化合物具有抗微生物活性和对人类癌细胞的细胞毒性。化合物21具有良好的光化学性质,具有大的斯托克斯位移(约130 nm),并成功应用于亚细胞成像。初步的机理研究和密度泛函理论(DFT)计算揭示了可能的反应途径。
Synthesis of 2-substituted indoles by iridium (III)-catalyzed C H functionalization of N-phenylpyridin-2-amines
A highly regioselective synthesis of 2-substituted indoles was realized through Ir(III)-catalyzed CH functionalization of N-phenylpyridin-2-amines followed by the reaction with sulfoxonium ylides and intramolecular cyclization under mild conditions. The reaction completed with broad range of substrate scopes and gave various 2-substituted indoles in up to 98% yields.
Rhodium(III)-catalyzed intermolecular cyclization of anilines with sulfoxonium ylides toward indoles
作者:Zhihao Shen、Chao Pi、Xiuling Cui、Yangjie Wu
DOI:10.1016/j.cclet.2019.01.033
日期:2019.7
Abstract Rhodium(III)-catalyzed synthesis of indole derivatives has been realized via cascade reaction of C H alkylation/nucleophilic cyclization starting from readily available N-phenylpyridin-2-amines and sulfoxonium ylides. Notably, this transformation could smoothly proceed with high yields, good regioselectivity, and feature broad group tolerance and under redox-neutral condition to avoid external