2,2,2-trifluoro-N'-phenylacetohydrazide;phenylhydrazide of trifluoroacetic acid;trifluoroacetaldehyde phenylhydrazone;N-Phenyl-N'-(trifluoracetyl)hydrazin;N-Phenyl-N'-trifluoroacetylhydrazine;N'-phenyltrifluoroacetohydrazide
Route to Benzo- and Pyrido-Fused 1,2,4-Triazinyl Radicals via <i>N</i>′-(Het)aryl-<i>N</i>′-[2-nitro(het)aryl]hydrazides
作者:Andrey A. Berezin、Georgia Zissimou、Christos P. Constantinides、Yassine Beldjoudi、Jeremy M. Rawson、Panayiotis A. Koutentis
DOI:10.1021/jo402481t
日期:2014.1.3
involves the N′-(2-nitroarylation) of easily prepared N′-(het)arylhydrazides via nucleophilic aromatic substitution of 1-halo-2-nitroarenes, which in most cases gives N′-(het)aryl-N′-[2-nitro(het)aryl]hydrazides in good yields. Mild reduction of the nitro group followed by an acid-mediated cyclodehydration gives the fused triazines, which upon alkali treatment afford the desired radicals. Fifteen examples
Synthesis of fluorine-containing alkyl 2-cyano-3-oxocarboxylates. Reactions with nucleophiles
作者:O. G. Kuzueva、Ya. V. Burgart、V. I. Saloutin、O. N. Chupakhin
DOI:10.1007/bf02494751
日期:1999.10
Fluorine-containing alkyl 2-cyano-3-oxocarboxylates were synthesized for the first time by the reaction of ethyl cyanoacetate with fluorine-substituted carboxylic acid halides or alkyl carboxylates. The reactions with hydrazine hydrate, phenylhydrazine, ando-phenylenediamine give hydrazinium (ammonium) enolates or products of acid decomposition.
Assembly of <i>N</i>,<i>N</i>-Disubstituted Hydrazines and 1-Aryl-1<i>H</i>-indazoles via Copper-Catalyzed Coupling Reactions
作者:Xiaodong Xiong、Yongwen Jiang、Dawei Ma
DOI:10.1021/ol300847v
日期:2012.5.18
CuI-catalyzed coupling of N-acyl-N′-substituted hydrazines with aryl iodides takes place at 60–90 °C to afford N-acyl-N′,N′-disubstituted hydrazines regioselectively and thereby gives a facile method for assembling N,N-diaryl hydrazines. N-Acyl-N′-substituted hydrazines can also react with 2-bromoarylcarbonylic compounds at 60–125 °C under the catalysis of CuI/4-hydroxy-l-proline to provide 1-aryl-1H-indazoles
Copper(<scp>ii</scp>)-catalyzed coupling reaction: an efficient and regioselective approach to N′,N′-diaryl acylhydrazines
作者:Ji-Quan Zhang、Gong-Bin Huang、Jiang Weng、Gui Lu、Albert S. C. Chan
DOI:10.1039/c4ob02343a
日期:——
An efficient and regioselective copper(ii)-catalyzed coupling reaction of N′-aryl acylhydrazines for the synthesis of N′,N′-diaryl acylhydrazines has been developed.
Regioselective Decarboxylative Cycloaddition Route to Fully Substituted 3‐CF
<sub>3</sub>
‐Pyrazoles from Nitrilimines and Isoxazolidinediones
作者:Yu‐Chen Tian、Jun‐Kuan Li、Fa‐Guang Zhang、Jun‐An Ma
DOI:10.1002/adsc.202100091
日期:2021.4.13
1,4‐Diaryl‐5‐carboxamido substituted 3‐trifluoromethylpyrazoles are obtained with exclusive regioselectivity under transition‐metal‐free conditions. This decarboxylative [3+2] cycloaddition protocol was enabled by employing trifluoromethyl nitrilimines as 1,3‐dipoles, and isoxazolidinediones as CO2‐masked alkynyl dipolarophiles. The applicability of this method is further manifested by its compatibility