Self-Terminating Radical Oxygenations: Probing of the Scope of the Concept by Use of Various Organic O-Centered Radicals
作者:Christian Jargstorff、Uta Wille
DOI:10.1002/ejoc.200300257
日期:2003.8
Addition of various organic O-centered radicals XO• i.e. (alkoxycarbonyl)oxyl radicals, ROC(O)O•, [(alkoxycarbonyl)acyl]oxyl radicals, ROC(O)C(O)O•, (carbamoyl)oxyl radicals, R2NC(O)O•, alkoxyl radicals, RO•, and nitroxyl radicals, R2NO•} to alkynes initiates an oxidative radical cyclization cascade, which is terminated by release of a C- or N-centered radical X•. This finding clearly highlights the
添加各种以 O 为中心的有机基团 XO• 即(烷氧基羰基)氧基团、ROC(O)O•、[(烷氧基羰基)酰基]氧基团、ROC(O)C(O)O•、(氨基甲酰基)氧基团、R2NC(O)O•、烷氧基自由基RO• 和硝酰基自由基R2NO•} 到炔烃引发氧化自由基环化级联反应,该级联反应通过释放以C 或N 为中心的自由基X• 终止。这一发现清楚地突出了最近发现的自终止自由基氧化概念的普遍性,通过该概念,C≡C 三键可以在非常温和的反应条件下转化为羰基。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)