The Smiles rearrangement of 2-aryloxy-5-nitrophenoxides. Attempted routes to benzoxirens and tribenzo[b,e,h]trioxonins
作者:Christopher A. Ramsden
DOI:10.1039/p19810002456
日期:——
8-dinitrodibenzo-p-dioxins (6d) and (6e). The mechanism of formation of the 2,8-isomer (6e) is shown to involve Smiles rearrangement of potassium 2-(2-bromo-5-nitrophenoxy)-5-nitrophenoxide (9a). Further examples of Smiles rearrangements of 2-aryloxy-5-nitrophenoxides and an attempted synthesis of the tribenzo-[b,e,h]trioxonin derivatives (16) are described.
通过2-卤代苯氧化物的热解形成二苯并-p-二恶英似乎不涉及中间体苯并氧杂s。2-溴-5-硝基苯氧钾(1b)的热自缩合得到2,7-和2,8-二硝基二苯并-p-二恶英的混合物(6d)和(6e)。2,8-异构体(6e)的形成机理涉及2-(2-溴-5-硝基苯氧基)-5-硝基苯酚钾(9a)的Smiles重排。描述了2-芳氧基-5-硝基苯氧化物的Smiles重排和尝试合成三苯并- [ b,e,h ]三氧黄酮衍生物(16)的其他实例。