A new highly efficient cascade reaction of pyrazolines with α,β-unsaturated carbonyl compounds catalyzed by DBU was reported. The process underwent the first deprotection/Michael addition reaction to give 4-substituted pyrazoline derivatives, which were further converted into 4,4-di-substituted pyrazolone derivatives through the second deprotection/Michael reaction. The mechanism for this reaction
报道了
吡唑啉与
DBU催化的α,β-不饱和羰基化合物的新型高效级联反应。该方法进行第一次脱保护/ Michael加成反应,得到4-取代的
吡唑啉衍
生物,通过第二次脱保护/ Michael反应将其进一步转化为4,4-二取代的
吡唑啉酮衍
生物。还研究了该反应的机理。