Multisubstituted pyrazole synthesis via [3 + 2] cycloaddition/rearrangement/N H insertion cascade reaction of α-diazoesters and ynones
作者:Peng Zhao、Zi Zeng、Xiaoming Feng、Xiaohua Liu
DOI:10.1016/j.cclet.2020.11.053
日期:2021.1
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。