Asymmetric Allylic C–H Oxidation for the Synthesis of Chromans
摘要:
An enantioselective intramolecular allylic C-H oxidation to generate optically active chromans has been accomplished under the cooperative catalysis of a palladium complex of chiral phosphoramidite ligand and 2-fluorobenzoic acid. Mechanistic studies suggest that this reaction commences with a Pd-catalyzed allylic C-H activation event and then undergoes asymmetric allylic alkoxylation. The synthetic significance of the method has been embodied by concisely building up a key chiral intermediate to access (+)-diversonol.
A Rapid and Additive-Free Ruthenium-Catalyzed Reductive Amination of Aromatic Aldehydes
作者:Christian Kerner、Sascha-Dominic Straub、Y. Sun、Werner R. Thiel
DOI:10.1002/ejoc.201600515
日期:2016.6
2-[2-(dimethylamino)pyrimidin-4-yl]pyridine} is highly reactive in catalyzing the reductive amination of aromaticaldehydes through in situ generated imines with 2-propanol as the hydrogen source following a transfer-hydrogenation mechanism. This transformation does not require any activating additives and is applicable to a broad variety of aldehydes.
Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1<i>H</i>-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
report the synthesis of amines/imines directly from alcohol and amines via hydrogen autotransfer or acceptorless dehydrogenation catalyzed by well-defined phosphine-free Mn complexes. Both imines and amines can be obtained from the same set of alcohols and amines using the same catalyst, only by tuning the reaction conditions. The amount and nature of the base are found to be a highly important aspect for
Tungsten‐Catalyzed Direct
<i>N</i>
‐Alkylation of Anilines with Alcohols
作者:Xiao‐Bing Lan、Zongren Ye、Chenhui Yang、Weikang Li、Jiahao Liu、Ming Huang、Yan Liu、Zhuofeng Ke
DOI:10.1002/cssc.202002830
日期:2021.2.5
tungsten‐catalyzed N‐alkylation reaction of anilines with primary alcohols via BH/HA. This phosphine‐free W(phen)(CO)4 (phen=1,10‐phenthroline) system was demonstrated as a practical and easily accessible in‐situ catalysis for a broad range of amines and alcohols (up to 49 examples, including 16 previously undisclosed products). Notably, this tungsten system can tolerate numerous functional groups,
Enhanced Hydride Donation Achieved Molybdenum Catalyzed Direct <i>N</i>-Alkylation of Anilines or Nitroarenes with Alcohols: From Computational Design to Experiment
作者:Weikang Li、Ming Huang、Jiahao Liu、Yong-Liang Huang、Xiao-Bing Lan、Zongren Ye、Cunyuan Zhao、Yan Liu、Zhuofeng Ke
DOI:10.1021/acscatal.1c02956
日期:2021.8.20
An example of homogeneous Mo-catalyzed direct N-alkylation of anilines or nitroarenes with alcohols is presented. The DFT aimed design suggested the easily accessible bis-NHC-Mo(0) complex features a strong hydride-donating ability, achieving effective N-alkylation of anilines or challenging nitroarenes with alcohols. The enhanced hydride-donating strategy should be useful in designing highly active
介绍了均相 Mo 催化的苯胺或硝基芳烃与醇的直接N-烷基化的例子。DFT 目标设计表明,易于获得的双-NHC-Mo(0) 配合物具有强大的氢化物供体能力,可实现苯胺的有效N-烷基化或用醇挑战硝基芳烃。增强的氢化物捐赠策略应该有助于设计用于借氢转化的高活性系统。