A one-pot synthesis of 1,4-dithiins and 1,4-benzodithiins from ketones using the recyclable reagent 1,1′-(ethane-1,2-diyl)dipyridinium bistribromide (EDPBT)
作者:Siva Murru、Veerababurao Kavala、C.B. Singh、Bhisma K. Patel
DOI:10.1016/j.tetlet.2006.12.003
日期:2007.2
the corresponding ketones in one-pot using the recyclable reagent, 1,1′-(ethane-1,2-diyl)dipyridinium bistribromide (EDPBT) is described. This method is mild, simple, environmentally benign and is applied successfully for the ring expansion of 1,3-dithiolane to 1,4-dithiins and the ring expansion associated with aromatisation of cyclic ketones with or without double bonds in the ring. The main feature
描述了使用可循环使用的试剂1,1'-(乙烷-1,2-二基)双吡啶鎓溴化吡啶鎓(EDPBT)从一锅中从相应的酮中新颖地获得1,4-二硫辛和1,4-苯并二硫辛的方法。该方法温和,简单,对环境无害,可成功地用于1,3-二硫戊环扩环成1,4-二硫辛以及与环酮的芳构化相关的扩环,该环酮在环中带有或不带有双键。该方法的主要特征是EDPBT在1,3-二硫杂环戊烷的形成中起促进剂的作用,在扩环步骤中起试剂的作用。用过的试剂可以回收,再生和再利用。