Synthesis of trifluoromethylated pyrazolidines by [3 + 2] cycloaddition
作者:Xiansha Peng、Danfeng Huang、Ke-Hu Wang、Yalin Wang、Juanjuan Wang、Yingpeng Su、Yulai Hu
DOI:10.1039/c7ob01299c
日期:——
A highly efficient [3 + 2] cycloaddition between trifluoromethylated N-acylhydrazones and nitroolefins in the presence of potassium hydroxide under phase transfer catalysis is developed to afford potentially bioactive trifluoromethylated pyrazolidines, which can be further transformed into trifluoromethylated pyrazoles in good yields.
[3+2] Cycloaddition of Trifluoromethylated N-Acylhydrazones with Maleates: Synthesis of Trifluoromethylated Pyrazolidines
作者:Lan Wen、Danfeng Huang、Ke-Hu Wang、Yuxiang Wang、Lili Liu、Zheng Yang、Yingpeng Su、Yulai Hu
DOI:10.1055/s-0036-1591768
日期:2018.5
developed under basic conditions. This protocol provides an easy access to potentially bioactive trifluoromethylated pyrazolidines in moderate to excellent yields. It also illustrates that the trifluoromethylated N-acylhydrazones are useful trifluoromethyl building blocks for the synthesis of trifluoromethylated N-heterocycles. An efficient [3+2] cycloaddition reaction of trifluoromethylated N-acylhydrazones
<i>N</i>-Arylations of trifluoromethylated <i>N</i>-acylhydrazones with diaryliodonium salts as arylation reagents
作者:Huaiyuan Zhang、Ke-Hu Wang、Junjiao Wang、Yingpeng Su、Danfeng Huang、Yulai Hu
DOI:10.1039/c9ob00236g
日期:——
A novel and efficient N-arylation of trifluoromethylated N-acylhydrazones is described by using diaryliodoniumsalts as arylation reagents in the presence of copper salts. A wide variety of N-aryl acylhydrazones are obtained with good to excellent yields under mild reaction conditions.
Synthesis of trifluoromethyl formazans by reaction of trifluoromethyl N-acylhydrazones/N-Aryl hydrazones and aryldiazonium tetrafluoroborates
作者:Ke-Hu Wang、Chang Bian、Xiuwen Liang、Wenjing Luo、Junjiao Wang、Danfeng Huang、Yulai Hu
DOI:10.1016/j.jfluchem.2023.110211
日期:2023.11
azo-coupling reaction of trifluoromethyl N-acylhydrazones/N-aryl hydrazones with aryldiazonium tetrafluoroborates was developed for the synthesis of various trifluoromethyl formazans. This protocol has the advantages of mild reaction condition, broad substrate scope and easy operation, which extends the application of trifluoromethyl N-acylhydrazones/N-aryl hydrazones as versatile trifluoromethyl building blocks
The cyclization/rearrangement of α-hydroxy ketones with trifluoromethyl <i>N</i>-acylhydrazones to synthesize multi-substituted trifluoromethyloxazolines
A highly efficient and metal-free [3+2] cyclization/rearrangement reaction toward the synthesis of multisubstituted trifluoromethyloxazolines from α-hydroxyketones and trifluoromethyl N-acylhydrazones has been developed. The unprecedented rearrangement of the amide fragment under acidic conditions after cleavage of the N–N bond of acylhydrazones has opened up new avenues for the development of reactions