Synthesis of 2-Aminofurans by Sequential [2+2] Cycloaddition-Nucleophilic Addition of 2-Propyn-1-ols with Tetracyanoethylene and Amine-Induced Transformation into 6-Aminopentafulvenes
作者:Taku Shoji、Daichi Nagai、Miwa Tanaka、Takanori Araki、Akira Ohta、Ryuta Sekiguchi、Shunji Ito、Shigeki Mori、Tetsuo Okujima
DOI:10.1002/chem.201700121
日期:2017.4.11
Synthesis of 2‐aminofuran derivatives with an azulene or N,N‐dimethylanilino substituent was established by the formal [2+2] cycloaddition–retroelectrocyclization of 3‐(1‐azulenyl or N,N‐dimethylanilino)‐2‐propyn‐1‐ols with tetracyanoethylene, followed by intramolecular nucleophilic addition to the initially formed tetracyanobutadiene moiety of the internal hydroxyl group that come from 2‐propyn‐1‐ol
带有氮杂或N,N-二甲基苯胺基取代基的2-氨基呋喃衍生物的合成是通过3-(1-氮杂烯基或N,N的形式[2 + 2]环加成-逆电环化而建立的-二甲基苯胺基)-2-丙炔-1-醇与四氰基乙烯,然后分子内亲核加成至内部形成的2-羟基丙炔-1-醇的四氰基丁二烯部分。反应在温和的条件下以短的反应时间进行。反应产物可通过简单的纯化程序容易地获得。通过该反应获得的2-氨基呋喃衍生物可在与各种胺反应后转化为6-氨基富勒烯衍生物。通过单晶X射线结构分析证实了具有N,N-二甲基苯胺基取代基的2-氨基呋喃和6-氨基五烯酮的结构。