在温和且可扩展的电解条件下,已开发出无金属和无氧化剂的分子内脱氢N–N键的形成。从容易获得的N-(2-吡啶基)am有效地合成了各种有价值的1,2,4-三唑并[1,5- a ]吡啶。反应在恒定电流条件下,在简单的不分隔电池中进行,其中n Bu 4 NBr作为氧化还原介体和电解质。该方案适用于抗糖尿病化合物关键中间体的有效合成。
Novel and efficient base-mediated N-alkylation and amidation of amidines with alcohols have been developed, which can be carried out in one-pot reaction conditions, which allows for the synthesis of a wide range of N-alkyl amines and free amides in good to excellent yields with high atom economy. In contrast to borrowing hydrogen/hydrogen autotransfer or oxidative-type N-alkylation reactions, in which
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.