Et3N-catalyzed direct cycloaddition reaction of allenoates with acceptor diazo compounds
作者:Yu-Ting Tian、Fa-Guang Zhang、Jun-An Ma
DOI:10.1016/j.tet.2021.131922
日期:2021.2
A Et3N-catalyzed [3 + 2] cycloaddition reaction of allenoates with acceptor diazo compounds that include diazoesters, diazoketones, and diazoamides, has been developed. This transformation allows direct and regioselective synthetic route to a variety of pyrazoles from allenoates. 3-Alkynoates also participate in the cycloaddition reaction by isomerizing to the corresponding allenoates in situ.
己烯酸酯与包括重氮酯,重氮酮和重氮酰胺的受体重氮化合物的Et 3 N催化的[3 + 2]环加成反应已得到开发。这种转化允许直接和区域选择性地合成路线从烯丙酸酯到各种吡唑。3-炔酸酯还通过异构化成相应的烯丙基酸酯而参与环加成反应。