Iron-Catalyzed Oxidative Tandem Reactions with TEMPO Oxoammonium Salts: Synthesis of Dihydroquinazolines and Quinolines
作者:Renate Rohlmann、Tobias Stopka、Heinrich Richter、Olga Garcı́a Mancheño
DOI:10.1021/jo4007199
日期:2013.6.21
formation or C–C bond formation upon homocondensation or reaction with simple olefins, respectively. Cyclization followed by a final oxidation generates these classes of interesting bioactive heterocycles in one synthetic transformation. Additionally, the one-pot multicomponent synthesis of quinolines from anilines, aldehydes, and olefins has also been successfully developed under these mild oxidative conditions
已经开发了使用TEMPO氧铵盐作为温和,无毒的氧化剂,由N-烷基苯胺直接催化铁催化的二氢喹唑啉和喹啉的发散性串联氧化反应。Fe(OTf)2是形成二氢喹唑啉的首选路易斯酸催化剂,而FeCl 3则可以更好地合成喹啉。这种发散的方法意味着,对于两种合成,N的α-C(sp 3)–H键的直接氧化功能化-烷基苯胺的出现,分别导致它们与均相缩合或与简单烯烃反应时形成C–N键或形成C–C键。环化后再进行最终氧化,可以在一个合成转化中生成这类有趣的生物活性杂环。此外,在这些温和的氧化条件下,还成功地开发了由苯胺,醛和烯烃单锅多组分合成喹啉的方法。