QuadrupleFunctionalization: A one-pot regioselective [3+2] cycloaddition platform of fluorinatednitrileimines with dicyanoalkenes was established to produce a broad variety of fully substituted N1-aryl 3-di/trifluoromethyl-4/5-cyanopyrazole pharmacophores.
Base-Promoted (3 + 2) Cycloaddition of Trifluoroacetohydrazonoyl Chlorides with Imidates En Route to Trifluoromethyl-1,2,4-Triazoles
作者:Yue Zhang、Jun-Liang Zeng、Zhen Chen、Ren Wang
DOI:10.1021/acs.joc.2c01926
日期:2022.11.4
base-mediated (3 + 2) cycloaddition of trifluoroacetohydrazonoyl chlorides with imidates for the construction of 3-trifluoromethyl-1,2,4-triazoles has been described. This reaction is characterized by readily starting materials, simple reaction conditions, good yields, a broad substrate scope, and excellent regioselectivity. The utility of this protocol has been validated by the synthesis of a drug-like
Regioselective [3 + 2] cycloaddition of di/trifluoromethylated hydrazonoyl chlorides with fluorinated nitroalkenes: a facile access to 3-di/trifluoroalkyl-5-fluoropyrazoles
作者:Nan Zhang、Hai Ma、Chi Wai Cheung、Fa-Guang Zhang、Marcin Jasiński、Jun-An Ma、Jing Nie
DOI:10.1039/d3ob00644a
日期:——
We describe the base-mediated [3 + 2] cycloaddition reaction of di/trifluoromethylated hydrazonoyl chlorides with fluoronitroalkenes for the synthesis of densely functionalized 3-di/trifluoroalkyl-5-fluoropyrazoles with potent biological activity.
Synthesis of Difluoromethylated Pyrazoles by the [3 + 2] Cycloaddition Reaction of Difluoroacetohydrazonoyl Bromides
作者:Tongyu Han、Ke-Hu Wang、Ming Yang、Pengfei Zhao、Feng Wang、Junjiao Wang、Danfeng Huang、Yulai Hu
DOI:10.1021/acs.joc.1c02521
日期:2022.1.7
efficient difluoromethyl building blocks, difluoroacetohydrazonoyl bromides have been synthesized for the first time. The synthetic utility of this reagent for the construction of difluoromethyl organic compounds is demonstrated by their effective regioselective [3 + 2] cycloaddition reactions with ynones, alkynoates, and ynamides. The reactions provide a novel and efficient protocol to access difluoromethyl-substituted