Preferential catalytic hydrogenation of aromatic compounds versus ketones with a palladium substituted polyoxometalate as pre-catalyst
作者:Vladimir Kogan、Zeev Aizenshtat、Ronny Neumann
DOI:10.1039/b110937p
日期:2002.3.11
finding that arenes could be selectively reduced in the presence of distal ketone groups under similar conditions, 30 bar H2 and 200°C. For example, 1-phenyl-2-propanone yielded 1-cyclohexyl-2-propanone with no reduction of the ketone moiety. Additionally, aromatic compounds with vicinal (conjugated) ketone moieties underwent complete hydrogenation to saturated hydrocarbons and catalytic McMurry coupling
一种 钯负载在γ-氧化铝或活性炭上的具有Keggin结构的取代多金属氧酸盐用作 催化剂 催化前体 氢化。催化剂系统快速启用氢化 的 竞技场在30 bar H 2和230 °C下。最有趣的是发现竞技场在30 bar H 2和200 °C的类似条件下,如果存在远端酮基,则可以选择性地还原H 2 O 3。例如,1-苯基-2-丙酮 屈服 1-环己基-2-丙酮 没有 减少酮部分的基团。此外,芳香族化合物与邻近 (结合)酮 部分完成 氢化 饱和 碳氢化合物 并观察到催化McMurry偶合 脂族醛。
Iridium‐Catalyzed Remote Site‐Switchable Hydroarylation of Alkenes Controlled by Ligands
An iridium-catalyzed remote site-switchable hydroarylation of alkenes controlled by two different ligands was reported. The protocol enables access to the products functionalized at the subterminal methylene and terminal methyl positions on an alkyl chain in good results. The results of the control experiments and DFT calculations demonstrate that the reaction involves a chain-walking process and the
Bourguel, Bulletin de la Societe Chimique de France, 1927, vol. <4> 41, p. 1476
作者:Bourguel
DOI:——
日期:——
An Alkylidene Carbene C–H Activation Approach toward the Enantioselective Syntheses of Spirolactams: Application to the Synthesis of (−)-Adalinine
作者:Krishna Annadi、Andrew G. H. Wee
DOI:10.1021/acs.joc.5b02582
日期:2016.2.5
that the reaction efficiency is sensitive to the reaction temperature and the amount of lithio(trimethylsilyl)diazomethane employed, which led to the development of optimal reaction conditions for effecting alkylidene carbene generation-C–H insertion. Using the optimal reaction conditions, good to high yields (53–76%) of both γ- and δ-lactam spirocycles were obtained. The synthetic utility of the spirolactams