readily synthesized from N-(pyridin-2-yl)benzimidamides via phenyliodine bis(trifluoroacetate)-mediated intramolecular annulation. This novel strategy allows for the convenient construction of a 1,2,4-triazolo[1,5-a]pyridine skeleton through direct metal-free oxidative N–N bond formation, featuring a short reaction time and high reaction yields.
具有生物学重要性的1,2,4-三唑并[1,5- a ]吡啶很容易通过苯基碘双(三氟乙酸)介导的分子内环化反应从N-(吡啶-2-基)苯甲酰胺酰胺合成。这种新颖的策略允许通过直接形成无金属的氧化性N–N键来方便地构建1,2,4-三唑并[1,5- a ]吡啶骨架,其反应时间短且反应产率高。
I<sub>2</sub>/KI-Mediated Oxidative N–N Bond Formation for the Synthesis of 1,5-Fused 1,2,4-Triazoles from <i>N</i>-Aryl Amidines
An I2/KI-mediated oxidative N–N bond formation reaction is described. This new and environmentally benign approach allows for the convenientsynthesis of a variety of 1,2,4-triazolo[1,5-a]pyridines and other 1,5-fused 1,2,4-triazoles from readily available N-aryl amidines in an efficient and scalable fashion.
描述了I 2 / KI介导的氧化N–N键的形成反应。这种新的对环境无害的方法可以方便地从容易获得的N-芳基合成各种1,2,4-三唑并[1,5- a ]吡啶和其他1,5-稠合的1,2,4-三唑efficient以高效和可扩展的方式。
A Convenient Synthesis of 1,5-Fused 1,2,4-Triazoles from N-Arylamidines via Chloramine-T Mediated Intramolecular Oxidative N–N Bond Formation
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant、Bhupendra K. Sarma
DOI:10.1055/s-0037-1611906
日期:2019.10
substrates having different functionalities. A convenientsynthesis of 1,5-fused 1,2,4-triazoles from readily available N-arylamidines is reported. The reaction is efficiently promoted by chloramine-T to afford the desired products mostly in high yields and in relatively short time, through direct metal-free oxidative N−N bond formation. The mild nature of the synthesis and short reaction time are notable advantages
Trichloroisocyanuric acid-mediated synthesis of 1,5-fused 1,2,4-triazoles from N-heteroaryl benzamidines via intramolecular oxidative N–N bond formation
作者:Ashish Bhatt、Rajesh K. Singh、Bhupendra K. Sarma、Ravi Kant
DOI:10.1016/j.tetlet.2019.151026
日期:2019.9
A convenient synthesis of 1,5-fused 1,2,4-triazoles from readily available N-heteroaryl benzamidines is reported. The reaction is efficiently promoted by trichloroisocyanuric acid to afford the desired products, mostly in high yields and in relatively short time, through direct metal-free oxidative N-N bond formation. The mild nature of the synthesis and short reaction time are notable advantages of the developed protocol. This protocol is effective toward various substrates having different functionalities. (C) 2019 Elsevier Ltd. All rights reserved.