monosubstituted allenes in the presence of catalytic amounts of copper(I) chloride gives 1,3,5-substituted pyrazoles under mild conditions and very short reaction times. This site- and regioselective process involves first the complexation of copper(I) on the external double bond of the allene moiety, followed by nucleophilic attack on the central carbon atom of the so-formed copper(I)-complexed allene by the
When Hydrazonoyl Chlorides Meet Terminal Alkynes: Regioselective Copper(I)-Catalysed "Click" Sequential Reactions to 5-Substituted Pyrazoles
作者:Giorgio Molteni
DOI:10.3987/com-20-14268
日期:——
In the presence of catalytic amounts of copper(I) salts, terminal alkynes underwent the formation of copper(I) acetylides that enabled their nucleophilic addition onto hydrazonoyl chlorides followed by spontaneous cyclisation of the resulting alkynylhydrazone intermediate. This sequential reaction sequence was exploited as a facile and regioselective synthesis of 1,3,5-substituted pyrazoles. A catalytic
One-flask synthesis of 1,3,5-trisubstituted 1,2,4-triazoles from nitriles and hydrazonoyl chlorides via 1,3-dipolar cycloaddition.
一瓶法合成1,3,5-三取代-1,2,4-三唑,从腈和叠氮酰氯通过1,3-偶极环加成。
Facile One-Pot Synthesis of Methyl 1-Aryl-1<i>H</i>
-1,2,4-triazole-3-carboxylates from Nitrilimines with Vilsmeier Reagent
作者:Shuo-En Tsai、Kun-Heng Chiang、Ching-Chun Tseng、Nai-Wei Chen、Ching-Yuh Chern、Fung Fuh Wong
DOI:10.1002/ejoc.201801808
日期:2019.2.28
A selective and convenient one‐pot methods have been developed for the synthesis of 1,2,4‐triazoles and methyl 1H‐1,2,4‐triazole‐3‐carboxylates by using hydrazonoyl hydrochlorides (nitrilimines) with Vilsmeier reagent. 2‐Amino‐2‐(2‐arylhydrazono)acetates were prepared from 2‐chloro‐2‐(2‐arylhydrazono)acetates with bis(trimethylsilyl)amine [NH(SiMe3)2] as the isolated intermediates for the further mechanistic
已经开发了一种选择性方便的单罐方法,该方法是通过使用肼基酰基盐酸盐(硝化亚胺)和Vilsmeier试剂来合成1,2,4-三唑和1 H - 1,2,4-三唑-3-羧酸甲酯。2-氨基-2-(2-芳基肼基)乙酸酯是由2-氯-2-(2-芳基肼基)乙酸酯与双(三甲基甲硅烷基)胺[NH(SiMe 3)2 ]作为分离的中间体制备的,用于进一步的机理研究。
Development of Radiolabeled Ligands Targeting the Glutamate Binding Site of the <i>N</i>-Methyl-<scp>d</scp>-aspartate Receptor as Potential Imaging Agents for Brain
作者:Lucia Tamborini、Ying Chen、Catherine A. Foss、Andrea Pinto、Andrew G. Horti、Stephen F. Traynelis、Carlo De Micheli、Ronnie C. Mease、Kasper B. Hansen、Paola Conti、Martin G. Pomper
DOI:10.1021/acs.jmedchem.6b01344
日期:2016.12.22
a wide variety of neurological disorders such as Alzheimer’s disease, schizophrenia, and epilepsy. Imaging agents for PET and SPECT that target NMDARs in a subtype-selective fashion may enable better characterization of those disorders and enhance drug development. On the basis of a pyrazoline derivative that demonstrated neuroprotective effects in vivo, we synthesized a series of para-substituted analogues