Synthesis of 5-Aryl-3-(methylsulfanyl)-1<i>H</i>-pyrazoles<i>via</i>Three-Component Reaction of 1,1-Bis(methylsulfanyl)-2-nitroethene, Aromatic Aldehydes, and Hydrazine
作者:Abdolali Alizadeh、Hamid Reza Esmaili zand、Vahid Saberi、Javad Mokhtari
DOI:10.1002/hlca.201300070
日期:2013.12
An efficient approach for the preparation of functionalized 5‐aryl‐3‐(methylsulfanyl)‐1H‐pyrazoles 2 is described. This three‐component reaction between benzaldehydes 1, NH2NH2⋅H2O, and 1,1‐bis(methylsulfanyl)‐2‐nitroethene proceeds in EtOH under reflux conditions in good‐to‐excellent yields. The structures of 2 were corroborated spectroscopically (IR, 1H‐ and 13C‐NMR, and EI‐MS). A plausible mechanism
描述了一种有效的方法来制备功能化的5-芳基-3-(甲基硫烷基)-1 H-吡唑2。苯甲醛之间的这种三组分反应1,NH 2 NH 2 ⋅H 2 O,和1,1-双(甲硫基)-2-硝基乙烯进行在EtOH中良好至优异的产率在回流条件下。光谱证实了2的结构(IR,1 H-和13 C-NMR和EI-MS)。提出了这种反应的合理机制(方案2)。