Here we report a paired electrochemical coupling of readily accessible nitro-compounds with benzyl alcohols to yield nitrone derivatives. In this work, electrochemical behavior of nitrobenzene and benzyl alcohol derivatives was studied by cyclic voltammetry and controlled potential coulommetry. Electrochemical reactions have been performed in aqueous/ethanol (or acetonitrile) solutions by employing
Regioselective 1,3-dipolarcycloadditions of captodative 1-acetylvinyl p-nitrobenzoyloxy (1a) with propionitrile oxide, diphenylnitrile imine and diazoalkanes provided the corresponding 5-acetyl- isoxazoles and pyrazoles. Evidence to support the formation of the initial cycloadducts was obtained. The addition of nitrones also proved to be highly regio- and stereoselective.
1,3-Dipolar Cycloaddition Reactionsof Nitrones to Prop-1-ene-1,3-sultone
作者:Lun-Zu Liu、Li Tian、Guo-Yan Xu、Yong Ye
DOI:10.1055/s-2003-40201
日期:——
The reaction of prop-1-ene-1,3-sultone (1) with a variety of nitrones 2 afforded novel [3+2] cycloaddition products 3, 4, and 5 in good yield. Excellent regio- and stereoselectivity were achieved in the cycloaddition reaction with phenylnitrones.
Nitrones as Trapping Reagents of α,β-Unsaturated Carbene Intermediates - [1,2]Oxazino[5,4-<i>b</i>]indoles by a Platinum- Catalyzed Intermolecular [3+3] Cycloaddition
作者:Weibo Yang、Tao Wang、Yang Yu、Shuai Shi、Tuo Zhang、A. Stephen K. Hashmi
DOI:10.1002/adsc.201300338
日期:2013.5.17
Boc‐protected 2‐(3‐methoxy‐1‐propynyl)anilines and nitrones in platinum‐catalyzed reactions deliver [1,2]oxazino[5,4‐b]indoles. Twelve examples with yields of 41–95% are reported. Different substituents like nitro, trifluoromethyl, fluoro, bromo, and ester groups are tolerated. With regard to the mechanism, this reaction probably combines an initial intramolecular cyclization/elimination to vinylcarbenoid
在铂催化的反应中,一些容易获得的Boc保护的2-(3-甲氧基-1-丙炔基)苯胺和硝酮可提供[1,2]恶嗪基[5,4- b ]吲哚。报道了十二个产量为41–95%的例子。可以容忍不同的取代基,例如硝基,三氟甲基,氟,溴和酯基。关于机理,该反应可能结合了最初的分子内环化/消除为乙烯基类胡萝卜素物质,以及随后与硝酮的逐步的分子间[3 + 3]环加成反应。
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.