Palladium-Catalyzed Chelation-Assisted Aromatic C–H Nitration: Regiospecific Synthesis of Nitroarenes Free from the Effect of the Orientation Rules
作者:Wei Zhang、Shaojie Lou、Yunkui Liu、Zhenyuan Xu
DOI:10.1021/jo400594j
日期:2013.6.21
ortho-nitration of aryl C–H bond is described. A range of azaarenes such as 2-arylquinoxalines, pyridines, quinoline, and pyrazoles were nitrated with excellent chemo- and regioselectivity. Using the O-methyl oximyl group as a removable directing group, the regiospecific synthesis of a variety of o-nitro aryl ketones was achieved starting from aryl ketones via a three-step process involving the Pd-catalyzed
Rh(III)-Catalyzed C–H Alkylation of Arenes Using Alkylboron Reagents
作者:He Wang、Songjie Yu、Zisong Qi、Xingwei Li
DOI:10.1021/acs.orglett.5b01232
日期:2015.6.5
alkylation of arenes using commercially available alkyltrifluoroborates is disclosed. Oximes, heteroarenes, azomethines, N-nitrosoamines, and amides are viable directing groups to entail this transformation. The alkyl group in the boron reagent can be extended to primary alkyls, benzyl, and cycloalkyls, and the reaction proceeded with controllable mono- and dialkylation selectivity when both ortho C–H
[EN] MICROBIOCIDAL PYRAZOLE DERIVATIVES<br/>[FR] DÉRIVÉS MICROBICIDES DE PYRAZOLE
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2014075874A1
公开(公告)日:2014-05-22
The present invention relates to compounds of formula (I) wherein substituents are as defined in the claims. The invention also relates to methods of using the compounds of formula I to control or prevent infestation of plants, propagation material thereof, harvested crops or non-living materials by phytopathogenic or spoilage microorganisms or organisms potentially harmful to man.
Iridium‐Catalyzed Acid‐Assisted Hydrogenation of Oximes to Hydroxylamines
作者:Josep Mas‐Roselló、Christopher J. Cope、Eric Tan、Benjamin Pinson、Alan Robinson、Tomas Smejkal、Nicolai Cramer
DOI:10.1002/anie.202103806
日期:2021.7.5
stoichiometric amounts of methanesulfonic acid and reduced at room temperature, remarkably without cleavage of the fragile N−O bond. The exquisite functional group compatibility of our hydrogenation system was further demonstrated by additive tests. Experimental mechanistic investigations support an ionic hydrogenation platform, and suggest a role for the Brønstedacid beyond a proton source. Our studies
我们发现环金属化环戊二烯基铱 (III) 配合物是将肟均相氢化成羟胺产物的独特高效催化剂。稳定的铱 C,N 螯合至关重要,烷氧基取代的芳基酮亚胺配体可提供最佳催化性能。通过 X 射线晶体分析绘制了几种 Ir 配合物,以收集空间参数,这些参数可能指导更活性催化剂的合理设计。大量的肟和肟醚被化学计量的甲磺酸活化并在室温下被还原,显着地没有断裂脆弱的 NO 键。添加剂测试进一步证明了我们加氢系统的精细官能团兼容性。实验机理研究支持离子氢化平台,并建议布朗斯台德酸在质子源之外的作用。我们的研究提供了对这种新型酸性氢化的深入理解,并可能促进其改进和应用于其他具有挑战性的底物。
Ruthenium(II)-Catalyzed α-Fluoroalkenylation of Oxime Ethers with <i>gem</i>-Difluorostyrenes <i>via</i> C–H Activation and C–F Cleavage
作者:Lili Zhang、Kezuan Deng、Gaorong Wu、Jinyue Yang、Shibiao Tang、Xiaopan Fu、Chengcai Xia、Yafei Ji
DOI:10.1021/acs.joc.0c01842
日期:2020.10.2
A novel route for ruthenium(II)-catalyzed α-fluoroalkenylation of oxime ethers with gem-difluorostyrenes via C–Hactivation and C–F cleavage has been developed for the first time. Notably, the alkenyl units of products exhibit exclusive Z-configuration. This reaction features a broad substrate scope and good functional group tolerance. A plausible reaction mechanism is confirmed by an available cycloruthenated