Copper-Catalyzed Aerobic Oxidative Cyclization of Ketoxime Acetates with Pyridines for the Synthesis of Imidazo[1,2-a]pyridines
作者:Zhi-Hui Ren、Zheng-Hui Guan、Mi-Na Zhao、Yukun Yi、Yao-Yu Wang
DOI:10.1055/s-0035-1561950
日期:——
copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis of imidazo[1,2-a]pyridines has been developed. This reaction tolerates a wide range of functional groups and it affords a series of valuable imidazo[1,2-a]pyridines in high yields under mild conditions. A copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis
摘要 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。
Ruthenium-Catalyzed Cyclization of Ketoxime Acetates with DMF for Synthesis of Symmetrical Pyridines
A novel ruthenium-catalyzed cyclization of ketoxime carboxylates with N,N-dimethylformamide (DMF) for the synthesis of tetrasubstituted symmetrical pyridines has been developed. A methyl carbon on DMF performed as a source of a one carbon synthon. And NaHSO3 plays a role in the reaction.
Rh-catalyzed sequential oxidative C–H activation/annulation with geminal-substituted vinyl acetates to access isoquinolines
作者:Haoke Chu、Song Sun、Jin-Tao Yu、Jiang Cheng
DOI:10.1039/c5cc04708k
日期:——
The concise synthesis of 3-substituted or non-C3-substituted isoquinolines through Rh-catalyzed sequential oxidativeC-Hactivation/annulation with geminal-substituted vinyl acetates was developed.
A three-componentcascadereaction is described that provides concise access to 6H-benzo[c]chromenes via Rh(III)-catalyzed annulation of aryl ketone O-acyloximes, quinones and acetone. Acetone acts as a co-solvent and as a reactant. This reaction shows high efficiency, atom- and step-economy, good substrate scope, excellent functional group compatibility and gives the products in good yields.
描述了一种三组分级联反应,该反应可通过Rh(III)催化的芳基酮O-酰基肟,醌和丙酮的环化反应,提供对6 H-苯并[ c ]色烯的精确访问。丙酮充当助溶剂和反应物。该反应显示出高效率,原子经济和阶梯经济,良好的底物范围,优异的官能团相容性,并以良好的收率得到产物。
Divergent copper-catalyzed syntheses of 3-carboxylpyrroles and 3-cyanofurans from <i>O</i>-acetyl oximes and β-ketoesters/nitriles
作者:Wilfrido E. Almaraz-Ortiz、Aldahir Ramos Orea、Oscar Casadiego-Díaz、Agustín Reyes-Salgado、Arturo Mejía-Galindo、Rubén O. Torres-Ochoa
DOI:10.1039/d2ra04938d
日期:——
The reaction between O-acetyl oximes and β-ketoesters/nitriles catalyzed by copper generated polysubstituted pyrroles and furans, respectively, under redox–neutral reaction conditions. Using this protocol, pyrroles or furans could be obtained simply by choosing an appropriate activemethylene compound. Although both transformations occur essentially under the same reaction conditions, control experiments