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。
KI-catalyzed oxidative cyclization of α-keto acids and 2-hydrazinopyridines: efficient one-pot synthesis of 1,2,4-triazolo[4,3-<i>a</i>]pyridines
作者:De-Suo Yang、Juan Wang、Peng Gao、Zi-Jing Bai、Dong-Zhu Duan、Ming-Jin Fan
DOI:10.1039/c8ra06215c
日期:——
A one-pot approach to substituted 1,2,4-triazolo[4,3-a]pyridines has been developed that is based on a KI-catalyzed oxidative cyclization of α-keto acids and 2-hydrazinopyridines. This transition-metal-free procedure was highly efficient and shows good economical and environmental advantages.
基于 KI 催化的 α-酮酸和 2-肼基吡啶的氧化环化,开发了一种取代 1,2,4-三唑并[4,3- a ]吡啶的一锅法。这种不含过渡金属的工艺非常高效,并显示出良好的经济和环境优势。
Palladium-Catalyzed Chemoselective Monoarylation of Hydrazides for the Synthesis of [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Andreas Reichelt、James R. Falsey、Robert M. Rzasa、Oliver R. Thiel、Michal M. Achmatowicz、Robert D. Larsen、Dawei Zhang
DOI:10.1021/ol902868q
日期:2010.2.19
efficient and convenientmethod for the synthesis of [1,2,4]triazolo[4,3-a]pyridines was exemplified by the synthesis of 20 analogues bearing a variety of substituents at the 3-position. The methodology involves a palladium-catalyzed addition of hydrazides to 2-chloropyridine, which occurs chemoselectively at the terminal nitrogen atom of the hydrazide, followed by dehydration in acetic acid under microwave
合成[1,2,4]三唑并[4,3- a ]吡啶的一种有效而方便的方法,是通过合成20个在3位带有取代基的类似物来举例说明的。该方法包括将钯催化的酰肼加成至2-氯吡啶,其在酰肼的末端氮原子上发生化学选择性,然后在微波辐射下于乙酸中脱水。
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