A Traceless Heterocyclic Amine Mediator in Regioselectivity−Switchable Formal [1 + 2 + 2] Cycloaddition Reaction to 1,3,4- and 1,4,5-Trisubstituted Pyrazoles
作者:Jie Huo、Xiao Geng、Wanmei Li、Pengfei Zhang、Lei Wang
DOI:10.1021/acs.orglett.2c04227
日期:2023.1.27
diversity and complexity by slightly changing the reaction conditions. Described herein is a regioselectivity-switchable formal [1 + 2 + 2] cycloaddition reaction from difluoroalkyl compounds, enaminones, and RNHNH2, ultimately using 1-methylindazol-3-amine as a traceless mediator to switch the inherent regioselectivity of 1,3,4-trisubstituted pyrazole formation to 1,4,5-trisubstituted pyrazoles. Remarkable
可切换的多组分反应已成为通过稍微改变反应条件来构建具有骨架多样性和复杂性的化合物库的有吸引力的工具。本文描述的是二氟烷基化合物、烯胺酮和 RNHNH 2的区域选择性可切换形式 [1 + 2 + 2] 环加成反应,最终使用 1-methylindazol-3-amine 作为无痕介质来切换 1,3 的固有区域选择性, 4-三取代吡唑形成1,4,5-三取代吡唑。这项工作的显着特点是条件温和、操作简单、适用范围广。