Gold(I)-Catalyzed Reactions of 1-(<i>ortho</i>-Alkynylaryl)ureas: Highly Selective Heterocyclization and Synthesis of Mixed<i>N</i>,<i>O</i>-Acetals
作者:Ana Gimeno、Ana B. Cuenca、Mercedes Medio-Simón、Gregorio Asensio
DOI:10.1002/adsc.201300730
日期:2014.1.13
The open chain amino O,O‐acetals and a series of new cyclic mixed N,O‐acetals containing the trifluoroethyl group were synthesized when the reactions were performed in ethanol or trifluoroethanol, respectively, as solvent. The procedure allows for an easy access to this versatile class of key intermediates in organic synthesis from simple starting materials. The effect of using either DMF or protic
现成的1-(邻乙炔基芳基)脲衍生物在二甲基甲酰胺(DMF )中经历选择性的金/银[AuCl(IPr)] / AgSbF 6 }催化的N -6 exo- dig或N -5- endo dig杂环化过程)在60°C下。苯并恶嗪衍生物,即通过尿素氧进行O -6- exo- dig环闭合的产物,只有在N-3碱度大大降低时才能在催化条件下观察到,但在低化学计量比过程中很容易分离。温度。开链氨基O,O-乙缩醛和一系列新的环状混合当分别在乙醇或三氟乙醇中作为溶剂进行反应时,会合成含有三氟乙基的N,O-缩醛。该方法可以轻松地从简单的起始原料获得有机合成中这类通用的关键中间体。报道了使用DMF或质子溶剂对反应过程的影响。