Photodimerization of 4-Aryl-1,4-dihydropyridines in 1-Butyl-3-methylimidazolium Tetrafluoroborate
作者:Jing-Yu He、Hui-Zhen Jia、Qing-Guo Yao、Si-Jie Liu、Hong-Kun Yue、Wei-Yan Liu、Xiao-Hong Wang、Jing-Chao Tian
DOI:10.1246/cl.140513
日期:2014.10.5
A simple, efficient, and convenient method for the photodimerization of 4-aryl-1,4-dihydropyridine in room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) has been developed. By this way, head-to-tail syn-dimers and 3,9-diazatetraasteranes were obtained in good to excellent yields. In addition, [Bmim][BF4] can be reused at least 5 times as the medium without obvious decrease in reaction time and yield.
开发了一种简单、高效、便利的方法,用于在室温离子液体1-丁基-3-甲基咪唑四氟硼酸盐([Bmim][BF4])中进行4-芳基-1,4-二氢吡啶的光二聚化。通过这种方法,得到了头尾连接的同聚二聚体和3,9-二氮四星烷,产率良好至极佳。此外,[Bmim][BF4]作为反应介质可重复使用至少5次,反应时间和产率没有明显下降。