Synthesis of Neutral Spin-Delocalized Electron Acceptors for Multifunctional Materials
摘要:
A new synthetic route to stable spin-delocalized radicals, annelated nitronyl nitroxides, has been developed on the basis of the condensation of benzofuroxan with aryl nitrones. The electronic structure of the resulting radicals was investigated through absorption spectroscopy, EPR, electrochemistry, and computation (DFT-UB3LYP). The annelated radicals exhibit electronic transitions in the near IR (850-900 nm) and are excellent electron acceptors (E-red similar to 0.0 vs SCE) ideal for the development of multifunctional magnetic materials.
Cooperative Silver- and Base-Catalyzed Diastereoselective Cycloaddition of Nitrones with Methylene Isocyanides: Access to 2-Imidazolinones
作者:Yan Chen、Yijing Wu、Andrey Shatskiy、Yuhe Kan、Markus D. Kärkäs、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1002/ejoc.202000437
日期:2020.6.23
A protocol involving cooperative silver‐ and base‐catalyzed diastereoselective cycloaddition of nitrones with isocyanides is described, delivering several valuable 2‐imidazolinones derivatives as single diastereomers. A plausible reaction mechanism is rationalized by DFT calculations. DBU plays dual roles in the developed reaction, acting as both the base and ligand.
Iridium-Catalyzed Redox-Neutral C2 and C3 Dual C–H Functionalization of Indoles with Nitrones toward 7<i>H</i>-Indolo[2,3-<i>c</i>]quinolines
作者:Miao Li、Yaqun Dong、Cong Zhou、Junxue Bai、Jiang Cheng、Jianwei Sun、Song Sun
DOI:10.1021/acs.orglett.1c02975
日期:2021.11.5
An iridium-catalyzed redox-neutral C-2 and C-3 dualC–Hfunctionalization of indoles with nitrones has been developed, furnishing a range of 7H-indolo[2,3-c]quinolines with high efficiency and regioselectivity under mild reaction conditions. Notably, sequential multiple C–H bond cleavage and C–C bond formation constitute the key events of this process, in which nitrone serves as a building block and
已开发出铱催化氧化还原中性 C-2 和 C-3 双 C-H 官能化吲哚与硝酮,提供一系列 7 H-吲哚[2,3- c ]喹啉,在温和的条件下具有高效率和区域选择性反应条件。值得注意的是,连续的多重 C-H 键断裂和 C-C 键形成构成了该过程的关键事件,其中硝酮作为构建块和氧化剂。与之前的 7 H-吲哚并[2,3- c ]喹啉方法不同,这种新开发的反应具有容易获得的底物、操作简单、范围广、效率高到高和优异的区域选择性。
Microwave-induced organometallic reactions in aqueous media. Use of Ga and Bi for the allylation of aromatic N-oxides and hydrazones
作者:Dhrubojyoti D. Laskar、Mukut Gohain、Dipak Prajapati、Jagir S. Sandhu
DOI:10.1039/b108525p
日期:2002.2.11
Homoallylic hydroxylamines and homoallylic hydrazides were synthesised in excellent yields by the reaction of allylgallium or allylbismuth reagent, generated in situ in the presence of 0.1 equivalent of NH4Cl–Bu4NBr, with aldonitrones and hydrazones in aqueous media. The reaction rate can be increased dramatically under microwave activation.