Highly Selective Hydrogenation of C═C Bonds Catalyzed by a Rhodium Hydride
作者:Yiting Gu、Jack R. Norton、Farbod Salahi、Vladislav G. Lisnyak、Zhiyao Zhou、Scott A. Snyder
DOI:10.1021/jacs.1c04683
日期:2021.6.30
Undermildconditions (room temperature, 80 psi of H2) Cp*Rh(2-(2-pyridyl)phenyl)H catalyzes the selectivehydrogenation of the C═C bond in α,β-unsaturated carbonyl compounds, including natural product precursors with bulky substituents in the β position and substrates possessing an array of additional functionalgroups. It also catalyzes the hydrogenation of many isolated double bonds. Mechanistic
在温和条件下(室温,80 psi H 2)Cp*Rh(2-(2-吡啶基)苯基)H催化α,β-不饱和羰基化合物(包括天然产物前体)中C=C键的选择性氢化在 β 位具有庞大的取代基,并且底物具有一系列额外的官能团。它还催化许多分离的双键的氢化。机理研究表明,不涉及自由基中间体,并且催化剂似乎是均相的,从而为类似氢化过程的现有方案提供了重要的互补性。
Protected Chloroethyl and Chloropropyl Amines as Conformationally Unrestricted Annulating Reagents
作者:Qing Shi、Mariah C. Meehan、Michael Galella、Hyunsoo Park、Purnima Khandelwal、John Hynes、T. G. Murali Dhar、David Marcoux
DOI:10.1021/acs.orglett.7b03548
日期:2018.1.19
The purpose of this letter is to document the use of protected chloroethyl and chloropropyl amines as conformationally unrestricted ambiphilic reagents that undergo annulation reactions with Michael acceptors. This reaction is wide in scope and utilizes reagents that are commercially available, inexpensive, and stable. Furthermore, this reaction is easy to execute and proceeds rapidly.
Fe-Catalyzed Allylic C–C-Bond Activation: Vinylcyclopropanes As Versatile a1,a3,d5-Synthons in Traceless Allylic Substitutions and [3 + 2]-Cycloadditions
作者:André P. Dieskau、Michael S. Holzwarth、Bernd Plietker
DOI:10.1021/ja300294a
日期:2012.3.21
The low-valent iron complex Bu(4)N[Fe(CO)(3)(NO)] (TBAFe) catalyzes the allylic C-C-bond activation of electron-poor vinyl cyclopropanes to generate syntheticallyuseful a1,a3,d5-synthons which are prone to undergo multiple consecutive reactions. The versatility of this approach is demonstrated by a traceless allylic substitution and a formal [3 + 2] cycloaddition to give either functionalized acyclic
Facile synthesis of polysubstituted furans and dihydrofurans via cyclization of bromonitromethane with oxodienes
作者:Rongshun Chen、Xia Fan、Zhaozhong Xu、Zhengjie He
DOI:10.1016/j.tetlet.2017.08.027
日期:2017.9
A series of polysubstituted furans and dihydrofurans have been prepared from readily available oxodienes and bromonitromethane in modest to excellent yields. This facile synthetic method is developed on the basis of proprietary properties of nitro group such as strong electron-withdrawing ability and cleavability. The conversion of nitro-substituted dihydrofurans to furans is presumably realized by
One-Step Diastereoselective Pyrrolidine Synthesis Using a Sulfinamide Annulating Reagent
作者:Qing Shi、Nathaniel S. Greenwood、Mariah C. Meehan、Hyunsoo Park、Michael Galella、Bhupinder Sandhu、Purnima Khandelwal、John R. Coombs、William P. Gallagher、Carlos A. Guerrero、John Hynes、T. G. Murali Dhar、Francisco Gonzalez Bobes、David Marcoux
DOI:10.1021/acs.orglett.9b03560
日期:2019.11.15
highlights the use of chiral sulfinamides as nitrogen nucleophiles in intermolecular aza-Michael reactions. When chiral sulfinamides are coupled to a chloroethyl group, the corresponding novel annulating reagents can be used to streamline the stereoselective synthesis of complex pyrrolidine-containing molecules. As a result, it has enabled a medicinal chemistry campaign for the synthesis of biologically