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。
Copper-Catalyzed Synthesis of 4-Aryl-1H-1,2,3-triazoles from 1,1-Dibromoalkenes and Sodium Azide
作者:Xiaokun Wang、Chunxiang Kuang、Qing Yang
DOI:10.1002/ejoc.201101204
日期:2012.1
A new methodology for the Cu-catalyzed synthesis of 1H-1,2,3-triazoles from1,1-dibromoalkenes and sodiumazide is presented. Aryl dibromoolefins were efficiently converted into the corresponding 1,2,3-triazoles. A comprehensive number of functional groups were compatible with this reaction. 1,2,3-Triazoles were obtained in moderate to excellent yields.
Mesoporous Pd‐MCM‐41 catalyzed expeditious synthesis of 1,3,5‐triarylbenzenes and 4‐aryl‐NH‐1,2,3‐triazoles have been developed via denitrative cyclo‐trimerization of β‐nitrostyrenes and de‐nitrative [3+2] cycloaddition of β‐nitrostyrenes with TMSN3 respectively. The catalyst was reused at least up to eight times with minimum loss of catalytic activity.
Synthesis of <i>N</i>-vinyl isothiocyanates and carbamates by the cleavage of NH-1,2,3-triazoles with one-carbon electrophiles
作者:Vladimir Motornov、Petr Beier
DOI:10.1039/d2ob02115c
日期:——
Metal-free cascade reaction of NH-1,2,3-triazoles with one-carbon electrophiles, such as thiophosgene and triphosgene, led to N-vinylated ring cleavage products. Using this approach the synthesis of N-vinylisothiocyanates from NH-triazoles and thiophosgene was achieved. A variety of multifunctional compounds, such as N-vinylcarbamates, unsymmetrical vinylureas, carbamothioates, etc. was prepared by