available N‐aryl conjugated hydrazones with tert‐butyl iodide has been developed. In this reaction, tert‐butyl iodide is used as anhydrous HI source, and the generated HI acts as a Brønsted acid and a reducing agent. This operationally simple method allows access to various indole derivatives. Furthermore, the procedure can be applied to the synthesis of biologicallyactive compounds.
Visible-Light-Promoted Redox Neutral C–H Amidation of Heteroarenes with Hydroxylamine Derivatives
作者:Qixue Qin、Shouyun Yu
DOI:10.1021/ol501457s
日期:2014.7.3
redox neutral direct C–Hamidation of heteroarenes has been achieved. Hydroxylamine derivatives, which are easily accessed, have been employed as tunable nitrogen sources. These reactions were enabled by a visible-light-promoted single-electron transfer pathway without a directing group. A variety of heteroarenes, such as indoles, pyrroles, and furans, could go through this amidation with high yields (up
Benzotriazol-1-ylmethanol: An excellent bidentate ligand for the copper/palladium-catalyzed C-N and C-C coupling reaction
作者:Rajeev R. Jha、Jaspal Singh、Rakesh K. Tiwari、Akhilesh K. Verma
DOI:10.3998/ark.5550190.0014.219
日期:——
benzotriazole based N,O bidentate liga nds for the Cu-catalyzed N-arylation of πexcessive nitrogen heterocycles is described. This ligand accomplishes C-Ncoupling of Nheterocycles and C-Ccoupling of boronic acids with a variety of hindered, functionalized aryl/heteroaryl halides under mild reaction conditi ons in good to excellent yields. Using his ligandC-N and C-C (Suzuki) couplings with bromoarenes
描述了一种有效的基于苯并三唑的 N,O 双齿配体,用于铜催化的 π 过量氮杂环的 N-芳基化。该配体在温和的反应条件下以良好至极好的产率完成了杂环的 CN 偶联和硼酸与各种受阻的官能化芳基/杂芳基卤化物的 CC 偶联。使用他的配体 CN 和 CC (Suzuki) 与溴芳烃偶联可以在较少的催化剂负载下进行。一系列失活和受阻的芳基卤化物可以干净地反应,以高产率提供功能化的联芳基衍生物。
Visible light C–H amidation of heteroarenes with benzoyl azides
作者:E. Brachet、T. Ghosh、I. Ghosh、B. König
DOI:10.1039/c4sc02365j
日期:——
direct and atom economic C–Hamidation of electron rich heteroarenes in the presence of phosphoric acid, a photocatalyst and visible light. Hetero-aromatic amides are obtained in good yields at very mild reaction conditions with dinitrogen as the only by-product. The reaction allows the use of aryl-, heteroaryl- or alkenyl acyl azides and has a wide scope for heteroarenes, including pyrroles, indole
Visible-Light-Induced Direct Oxidative C−H Amidation of Heteroarenes with Sulfonamides
作者:Kun Tong、Xiaodong Liu、Yan Zhang、Shouyun Yu
DOI:10.1002/chem.201604014
日期:2016.10.24
A direct oxidative C−H amidation of heteroarenes with sulfonamides via nitrogen‐centered radicals has been achieved. Nitrogen‐centered radicals are directly generated from oxidative cleavage of N−H bonds under visible‐light photoredox catalysis. Sulfonamides, which are easily accessed, are used as tunable nitrogen sources and bleach (aqueous NaClO solution) is used as the oxidant. A variety of heteroarenes