Access to (<i>Z</i>)-β-Substituted Enamides from <i>N</i>1-H-1,2,3-Triazoles
作者:Tao Wang、Zongyuan Tang、Han Luo、Yi Tian、Mingchuan Xu、Qixing Lu、Baosheng Li
DOI:10.1021/acs.orglett.1c02087
日期:2021.8.20
A direct ring-opening/nucleophilic substitution reaction of N1-H-1,2,3-triazoles has been described. Divergent (Z)-β-halogen- or sulfonyl-substituted enamides could be stereospecifically synthesized in a tunable manner. This strategy might not only enable a new ring-opening method of N1-H-1,2,3-triazoles under nonmetal catalysis and mild reaction conditions but also offer a good opportunity to reliably
已经描述了N 1-H-1,2,3-三唑的直接开环/亲核取代反应。发散的 ( Z )-β-卤素或磺酰基取代的烯酰胺可以以可调的方式立体定向合成。这种策略不仅可以在非金属催化和温和的反应条件下实现N 1-H-1,2,3-三唑的新开环方法,而且还为可靠地获得多功能 ( Z )-β-取代的烯酰胺提供了良好的机会可用作进一步合成转化的合成前体。
Magnetically recoverable copper ferrite catalyzed cascade synthesis of 4-Aryl-1H-1,2,3-triazoles under microwave irradiation
Magnetically active CuFe2O4 catalyzed cascade synthesis of 4-Aryl-1H-1,2,3-triazoles undermicrowaveirradiation starting from aromatic aldehydes, sodium azide and nitromethane has been developed and demonstrated here. The catalyst system needed for the purpose was prepared following a procedure by A. Dandiya et al. with a slight modification and was characterized using FT-IR, XRD, SEM-EDX and TEM
磁性活性CuFe 2 O 4催化4-芳基-1 H的级联合成在微波辐射下,从芳族醛,叠氮化钠和硝基甲烷开始的-1,2,3-三唑已被开发出来并在此进行了证明。该目的所需的催化剂体系是按照A.Dandiya等人的方法制备的。稍作修改,并使用FT-IR,XRD,SEM-EDX和TEM分析对其进行表征。所开发方法的最显着优势是出色的时间经济性来进行转换。其他功能还包括简单的操作程序,广泛的基材覆盖范围和催化剂的易于回收。已经测试了催化剂的可重复使用性,发现直到第六个循环都非常令人满意,而效率没有显着损失。所有合成的化合物均已使用FTIR,1 H和13进行了表征CNMR光谱,HRMS。
Cu-Catalyzed Site-Selective and Enantioselective Ring Opening of Cyclic Diaryliodoniums with 1,2,3-Triazoles
作者:Zengyin Chao、Mingming Ma、Zhenhua Gu
DOI:10.1021/acs.orglett.0c02256
日期:2020.8.21
A Cu-catalyzed enantioselective ring-opening/triazolylation reaction is reported. The reaction shows excellent chemoselectivity regarding the three different nitrogen atoms of 1,2,3-triazoles. The optically enriched axially chiral aryl iodides thus obtained were readily derivatized to different types of chiral phosphine ligands and their corresponding copper or palladium complexes.
A one‐pot three‐component reaction of aldehydes, nitroalkanes and NaN3 for the synthesis of NH‐1,2,3‐triazoles has been developed. The reaction provides a safe, efficient and step‐economic approach for the synthesis of various NH‐1,2,3‐triazoles in good to excellent yields.
Aluminium(III) Chloride-Catalyzed Three-Component Condensation of Aromatic Aldehydes, Nitroalkanes and Sodium Azide for the Synthesis of 4-Aryl-<i>NH</i>-1,2,3-triazoles
three‐component reaction of aromatic aldehydes, nitroalkanes, and sodium azide has been developed; this reaction sequence can be applied to a broad substrate scope and affords the corresponding 4‐aryl‐NH‐1,2,3‐triazoles in good to excellent yields. The milder reaction conditions and easier operation make this AlCl3‐catalyzed protocol more advantageous for the synthesis of 4‐aryl‐NH‐1,2,3‐triazoles.