Exhaustive Reduction of Esters Enabled by Nickel Catalysis
作者:Adam Cook、Sekar Prakash、Yan-Long Zheng、Stephen G. Newman
DOI:10.1021/jacs.0c02405
日期:2020.5.6
tolyl-derivatives. This is achieved by an organosilane-mediated ester hydrosilylation reaction and subsequent Ni/NHC catalyzed hydrogenolysis. The resulting conditions provide a direct and efficient alternative to multi-step procedures for this transformation that often require use of hazardous metal hydrides. Applications in the synthesis of -CD3 containing products, derivatization of bioactive molecules, and chemoselective
我们报告了将未活化的芳基酯直接还原为其相应的甲苯基衍生物的一步程序。这是通过有机硅烷介导的酯氢化硅烷化反应和随后的 Ni/NHC 催化氢解来实现的。由此产生的条件为通常需要使用危险金属氢化物的这种转化的多步骤程序提供了一种直接有效的替代方法。展示了在合成含 -CD3 的产品、生物活性分子的衍生化以及在其他 CO 键存在下进行化学选择性还原中的应用。
A Tandem Approach to Functionalized Carbazoles from Indoles via Two Successive Regioselective Oxidative Heck Reactions Followed by Thermal Electrocyclization
作者:Joydev K. Laha、Neetu Dayal
DOI:10.1021/acs.orglett.5b02265
日期:2015.10.2
A direct one-pot approach to the synthesis of carbazoles (mono-, di-, and trisubstituted) and α-carbolines from readily available indoles or 7-azaindoles and alkenes is described. Based on mechanistic studies, the tandem reaction follows the sequence: palladium-catalyzed regioselective C-3 alkenylation/palladium-catalyzed C-2 alkenylation/thermal electrocyclization.
Oxidative Pd(II)-Catalyzed C−H Bond Amination to Carbazole at Ambient Temperature
作者:James A. Jordan-Hore、Carin C. C. Johansson、Moises Gulias、Elizabeth M. Beck、Matthew J. Gaunt
DOI:10.1021/ja806543s
日期:2008.12.3
We report a new Pd(II)-catalyzed C-H bond amination reaction to form carbazoles, an important motif that is prevalent in a range of systems. The catalytic amination process operates under extremely mild conditions and produces carbazole products in good to excellent yields. Carbazoles possessing complex moleculararchitecture can also be formed using this reaction, highlighting its potential in natural
First Inverse Electron-Demand Diels–Alder Methodology of 3-Chloroindoles and Methyl Coumalate to Carbazoles
作者:Tezcan Guney、Jennifer J. Lee、George A. Kraus
DOI:10.1021/ol403733n
日期:2014.2.21
The first successful inverse electron-demand Diels–Alder has been demonstrated with the 2-pyrone methylcoumalate in conjunction with substituted indoles. Utilizing 1-alkyl-3-chloroindoles as the electron-rich dienophile efficiently generates carbazoles without the need for additional metal catalysts. Through a thermal, one-pot Diels–Alder/decarboxylation/elimination domino sequence, access to a class