An efficient synthesis of N-substituted indoles from indoline/indoline carboxylic acid via aromatization followed by C–N cross-coupling reaction by using nano copper oxide as a recyclable catalyst
new and elegant protocol for the synthesis of 1-substituted indoles was developed via aromatization of indoline/indoline carboxylic acid followed by C–N cross-coupling with various aryl halides in the presence of nano CuO as a recyclable catalyst, Cs2CO3 as a base in DMSO at 80 °C. 1-Substituted indoles were obtained in good to excellent yields and the catalytic system can be recycled up to four cycles
通过将二氢吲哚/二氢吲哚羧酸芳构化,然后在作为可回收催化剂的纳米CuO Cs 2 CO 3的存在下,与各种芳基卤化物进行C–N交叉偶联,开发了一种新的且优雅的合成1-取代的吲哚的方案。在80°C下用作DMSO的碱。得到的1-取代的吲哚的收率高至优异,催化体系最多可循环使用四个循环而不会损失催化活性。
Tryptamine Synthesis by Iron Porphyrin Catalyzed C−H Functionalization of Indoles with Diazoacetonitrile
作者:Katharina J. Hock、Anja Knorrscheidt、Renè Hommelsheim、Junming Ho、Martin J. Weissenborn、Rene M. Koenigs
DOI:10.1002/anie.201813631
日期:2019.3.11
non‐precious metal catalysts is an important research area for the development of efficient and sustainable processes. Herein, we describe the development of iron porphyrin catalyzed reactions of diazoacetonitrile with N‐heterocycles yielding important precursors of tryptamines, along with experimental mechanistic studies and proof‐of‐concept studies of an enzymatic process with YfeX enzyme. By using readily
Certain 1-heteroaryl-3-acyl-2-oxindoles wherein the acyl-substituent is thenoyl, furoyl, benzoyl or substituted benzoyl, are inhibitors of cycloxygenase and lipoxygenase enzymes and are useful as anti-inflammatory agents in mammals.
Certain N-(substituted)-1-heteroaryl-oxindole-3-carboxamides wherein the N-substituent is thienyl, furyl, phenyl or substituted phenyl, are inhibitors of cycloxygenase and lipoxygenase enzymes and are useful as anti-inflammatory agents in mammals.
Gold‐Catalyzed Oxidative Cross‐Coupling Reactions among Two Distinct Arenes and One Gold Carbene with Phosphoric Acids as Cocatalysts
作者:Manoj D. Patil、Balaji S. Kale、Rai‐Shung Liu
DOI:10.1002/adsc.202000879
日期:2020.12.22
Gold‐catalyzedoxidativecross‐coupling reactions of two distinct arenes with one gold carbene furnish triarylmethane products. Notably, competitive homo‐coupling reactions are efficiently suppressed with a phosphoric acid as co‐catalyst (10 mol%) in THF. These cross‐coupling reactions have a wide scope of applicable substrates, with respect to indoles, arylamines, and α‐aryl diazo cyanides or esters