Electrochemical oxidation of aldehyde-N-arylhydrazones into symmetrical-2,5-disubstituted-1,3,4-oxadiazoles
作者:Sushma Singh、Laxmi K. Sharma、Apoorv Saraswat、Ibadur R. Siddiqui、Rana K. Pal Singh
DOI:10.1007/s11164-012-1013-z
日期:2014.3
A convenient, efficient and one-pot synthesis of chemically and pharmaceutically interesting symmetrical-2,5-disubstituted-1,3,4-oxadiazoles is reported. The protocol involves anodic oxidation of aldehyde-N-arylhydrazones in anhyd. MeCN–LiClO4. Constant potential electrolysis carried out in an undivided cell and platinum electrodes leads to the formation of the corresponding oxadiazoles under ambient condition and the mechanism was deduced from voltammetry studies. The reaction proceeded smoothly with high atom economy.
报道了一种方便、高效的一锅法合成化学和药学上有趣的对称2,5-二取代-1,3,4-噁二唑。该方案涉及在无水的乙腈–氯酸锂中对醛-N-芳基肼进行阳极氧化。在未分隔的电池和铂电极中进行恒电位电解,在常温条件下生成相应的噁二唑,反应机制通过伏安研究进行了推导。反应过程顺利,原子经济性高。