作者:Takanobu Saitou、Yushu Jin、Kotaro Isobe、Takuya Suga、Jun Takaya、Nobuharu Iwasawa
DOI:10.1002/asia.202000476
日期:2020.7
The Rh‐catalyzed direct carboxylation of alkenyl C−H bonds was achieved by using pyrazole as a removable directing group. In the presence of 5 mol% RhCl3 ⋅ 3H2O, 6 mol% P(Mes)3, and 2 equiv. of AlMe2(OMe), the alkenyl C−H bond of various alkenylpyrazoles was directly carboxylated in good yields under CO2 atmosphere. Furthermore, several useful transformations of the pyrazole moiety of the product were
通过使用吡唑作为可移动的导向基团,可实现Rh催化的烯基CH键的直接羧化。在5%(摩尔)的RhCl的存在3 ⋅3H 2 O,6摩尔%P(MES)3,和2当量 在AlMe 2(OMe)的作用下,各种烯基吡唑的烯基CH键在CO 2气氛下以良好的产率直接被羧化。此外,实现了产物的吡唑部分的几种有用的转化,以高收率提供了合成上有用的羧酸衍生物。