I<sub>2</sub>-TBHP-catalyzed one-pot highly efficient synthesis of 4,3-fused 1,2,4-triazoles from N-tosylhydrazones and aromatic N-heterocycles via intermolecular formal 1,3-dipolar cycloaddition
I2-TBHP-catalyzed azomethine imine generation and subsequent regioselective 1,3-dipolarcycloaddition (DC) with aromatic N-heterocycles was developed to afford various 4,3-fused 1,2,4-triazoles in excellent yields. The method is operationally simple and highly efficient with broad functional group tolerance.
cross-coupling reaction has been developed under mild electrolytic conditions. In this atom- and step-economical one-pot process, valuable 1,2,4-triazolo[4,3-a]pyridines and related heterocyclic compounds could be synthesized efficiently from commercially available aliphatic or (hetero)aromatic aldehydes and 2-hydrazinopyridines. Various functional groups are compatible with this metal- and oxidant-free
在温和的电解条件下已开发出无试剂的分子内脱氢C–N交叉偶联反应。在这种原子经济和一步经济的一锅法中,有价值的1,2,4-三唑并[4,3- a ]吡啶和相关的杂环化合物可以从可商购的脂族或(杂)芳族醛和2-肼基吡啶。各种官能团都与这种无金属和无氧化剂的方案兼容,可以轻松地以克为单位进行操作。这种新方法被应用于最畅销药物Xanax的合成和后期功能化,以在生物学相关的先导分子中产生化学多样性。
A convenient one-pot synthesis of N-fused 1,2,4-triazoles via oxidative cyclization using chromium (VI) oxide
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1080/00397911.2018.1529795
日期:2019.1.2
Abstract A facile one-pot synthesis of N-fused 1,2,4-triazoles from heterocyclic hydrazines and aldehydes is reported. The reaction is efficiently promoted by chromium (VI) oxide to afford the desired products mostly in highyields and in relatively short time. The highyield of the products and short reaction time are notable advantages of the developed protocol. This protocol is effective toward
A simple and efficient automatable one step synthesis of triazolopyridines from carboxylic acids
作者:Ying Wang、Kathy Sarris、Daryl R. Sauer、Stevan W. Djuric
DOI:10.1016/j.tetlet.2007.02.004
日期:2007.3
Triazolopyridines can be rapidly and efficiently synthesized from a variety of carboxylic acids with 2-hydrazinopyridines in one simple step. The use of commercially available PS-PPh3 resin combined with microwave heating delivered the product triazolopyridines in good yields and purities.
RuCl3/Oxone: An efficient combination for the synthesis of 3-aryl-[1,2,4]triazolo[4,3-a]pyridines from 2-(2-arylidenehydrazinol)pyridines
作者:Tallapally Swamy、Padma Raviteja、Goskula Srikanth、Basi V. Subba Reddy、Vadde Ravinder
DOI:10.1016/j.tetlet.2016.10.110
日期:2016.12
An efficient and convenient method for the synthesis of 3-aryl[1,2,4]triazolo[4,3-a]pyridines has been developed involving RuCl3/Oxone oxidative cyclization of 2-(2-arylidenehydrazinyl)pyridines, which occurs chemoselectively at the pyridine nitrogen. RuCl3 can be used as an efficient homogeneous catalyst for the synthesis of triazolopyridines through a direct intramolecular cyclization involving CN
已经开发出一种有效且方便的合成3-芳基[1,2,4]三唑并[4,3- a ]吡啶的方法,该方法涉及RuCl 3 / Oxone对2-(2-亚芳基肼基嗪)吡啶的氧化环化反应。在吡啶氮上有化学选择性。RuCl 3可以用作通过涉及C N键形成的直接分子内环化合成三唑并吡啶的有效均相催化剂。