Nitration of Heteroaryltrimethyltins by Tetranitromethane and Dinitrogen Tetroxide: Mechanistic Aspects, Scope and Limitations
作者:Valérie Fargeas、Fabien Favresse、Didier Mathieu、Isabelle Beaudet、Pierre Charrue、Bruno Lebret、Marc Piteau、Jean-Paul Quintard
DOI:10.1002/ejoc.200210611
日期:2003.5
The nitration of 2-(trimethylstannyl)heteroarenes by tetranitromethane (TNM) or dinitrogen tetroxide has been shown to be possible when the HOMO energy of the heteroaryltin is high enough to allow the formation of the corresponding radical cation. The reaction proceeds through a charge-transfer complex between heteroaryltin and TNM, followed by a single-electron transfer, which is enhanced under sunlamp
当杂芳基锡的 HOMO 能量足够高以允许形成相应的自由基阳离子时,四硝基甲烷 (TNM) 或四氧化二氮对 2-(三甲基甲锡烷基) 杂芳烃的硝化已被证明是可能的。该反应通过杂芳基锡和 TNM 之间的电荷转移复合物进行,然后是单电子转移,在太阳灯照射下增强。因此,通过该方法获得了2-硝基苯并[b]呋喃、2-硝基苯并[b]噻吩、2-硝基吡啶和2-硝基吲哚。然而,由于 HOMO 轨道的低能量,2-甲锡烷基化嘧啶或甲锡烷基化 1,3,5-三嗪的硝化已被证明是不可能的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)