Al(OTf)3 as the catalyst are described. A series of 4-substituted pyrazoles were obtained via [3 + 2] cycloaddition, 1,5-ester shift, 1,3-H shift, and N H insertion process. Deuterium labelling experiments, kinetic studies and control experiments were carried out for the rationalization of the mechanism.
摘要描述了以Al(OTf)3为催化剂的烷基α-重氮酸酯和炔酮的级联反应。通过[3 + 2]环加成,1,5-酯转移,1,3-H转移和NH插入过程获得了一系列4-取代的
吡唑。为了使机理合理化,进行了
氘标记实验,动力学研究和对照实验。