An efficient and inexpensive synthesis of N-substituted amides from the Ritter reaction of nitriles with esters catalyzed by Fe(ClO4)3·H2O is described. Fe(ClO4)3·H2O is an economically efficient catalyst for the Ritter reaction under solvent-free conditions. Reactions of a range of esters (benzyl, sec-alkyl, and tert-butyl esters) with nitriles (primary, secondary, tertiary, and aryl nitriles) were
Ring-Expanding Reaction of Cyclopropyl Amides with Triphenylphosphine and Carbon Tetrahalide
作者:Yong-Hua Yang、Min Shi
DOI:10.1021/jo0516988
日期:2005.10.1
prepared in situ in the presence of 2 equiv of PPh3 and 1 equiv of CX4, and the ring-expanding products (N-substituted pyrrolidin-2-ones) were obtained in good yields. The reaction mechanism was investigated on the basis of oxygen-18tracer experiment.
We describe a novel reagent system to obtain acyl fluorides directly from three different functional group precursors: carboxylic acids, aldehydes, or alcohols. The transformation is achieved via a combination of trichloroisocyanuric acid and cesium fluoride, which facilitates the synthesis of various acyl fluorides in high yield (up to 99%). It can be applied to the late-stage functionalization of
Synthesis of Aliphatic Carboxamides Mediated by Nickel NN<sub>2</sub>
-Pincer Complexes and Adaptation to Carbon-Isotope Labeling
作者:Karoline T. Neumann、Aske S. Donslund、Thomas L. Andersen、Dennis U. Nielsen、Troels Skrydstrup
DOI:10.1002/chem.201804077
日期:2018.10.9
reagents, stoichiometric carbonmonoxide and amines is described for the first time, which can be adapted to late‐stage carbon‐isotope labeling. This work expands the scope of the highly established palladium‐promoted version of the reaction, by allowing carbon‐sp3 fragments to take part in the three‐component reaction. Finally, the results obtained show a remarkable effect of the pincer ligand for
首次介绍了使用NN 2钳形镍配合物,烷基锌试剂,化学计量一氧化碳和胺开发镍介导的氨基羰基化反应的方法,该方法可用于后期碳同位素标记。通过允许碳sp 3片段参与三组分反应,这项工作扩展了高度确立的钯促进反应的范围。最后,获得的结果显示了钳型配体在用胺进行的还原消除步骤中的显着效果,随后进行了13 C NMR光谱研究。
Carbonylative C−C Bond Activation of Electron-Poor Cyclopropanes: Rhodium-Catalyzed (3+1+2) Cycloadditions of Cyclopropylamides
作者:Andrew G. Dalling、Takayuki Yamauchi、Niall G. McCreanor、Lydia Cox、John F. Bower
DOI:10.1002/anie.201811460
日期:2019.1.2
Rh‐catalyzed carbonylative C−C bond activation of cyclopropylamides generates configurationally stable rhodacyclopentanones that engage tethered alkenes in (3+1+2) cycloadditions. These studies provide the first examples of multicomponent cycloadditions that proceed through C−C bond activation of “simple” electron poor cyclopropanes.