The one-pot synthesis of multisubstituted pyrazole derivatives was achieved viacatalyst-free 1,3-dipolar cycloaddition of ethyl diazoacetate and nitroalkenes as the key step and elimination of the leaving group (NO2 or Br) followed by intramolecular proton transfer with satisfactory yields.
一锅合成多取代的
吡唑衍
生物是通过无催化剂的1,3-偶极环加成反应实现的
重氮乙酸乙酯和硝基烯烃作为关键步骤,消除离去基团(NO 2或Br),然后以令人满意的产率进行分子内质子转移。