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。
AgNOx as Nitrogen Source for [1+1+3] Cycloaddition of Isocyanides with Isocyanates: Selective Synthesis of 1,2,4-Triazoles
A novel [1+1+3] annulation of AgNOx, isocyanides, and isocyanates for the selective synthesis of 1,2,4-triazoles is presented herein. In this transformation, AgNOx and isocyanates are used as nitrogen sources instead of the traditional hydrazine or diazonium reagents. This process also involves N–O/C–H/C═N bond cleavage and the construction of new N–N/C–N bonds with a good substrate scope and functional