Synthesis of 2-amino-4-phenyl-6-(phenylsulfanyl)-3,5-dicyanopyridines by tandem reaction
作者:Dong Hao、Zhong Yun-lei、Shen Xiao-peng、Yang Jin-ming、Fang Dong
DOI:10.1007/s11164-012-0984-0
日期:2014.2
A novel basic ionic liquid, 1-(2-aminoethyl)pyridinium hydroxide, containing both Brønsted base and Lewis base sites has been used as an efficient catalyst for the synthesis of 2-amino-4-phenyl-6-(phenylsulfanyl)-3,5-dicyanopyridines. The condensation and oxidation tandem reaction of aldehydes, malononitrile, and thiols, performed in aqueous ethanol, afforded reasonable to good yields within 30–60 min. After the reaction, the catalyst could be recycled and reused. A possible mechanism to account for the tandem reaction is proposed. .
一种新型的基本离子液体,即含有Brønsted碱和Lewis碱位点的1-(2-氨基乙基)吡啶鎓氢氧化物,已被用作合成2-氨基-4-苯基-6-(苯硫基)-3,5-二氰基吡啶的高效催化剂。在水-乙醇体系中进行的醛、丙二腈和硫醇的缩合与氧化串联反应,在30-60分钟内获得了合理至良好的产率。反应结束后,催化剂可以回收并重复使用。提出了一个可能的机制来解释串联反应。