A Convenient One-Pot Synthesis of Triazolopyridine and Related Heterocycle Fused-Triazole Analogs Through Copper Catalyzed Oxidative Cyclization Strategy
作者:R. Srinivasan、J. Sembian Ruso、N. S. Nagarajan、R. Senthil Kumaran、G. Manickam
DOI:10.1002/jhet.2331
日期:2016.3
One‐pot synthesis of heterocycle fused‐triazole analogs from the corresponding aldehydes and heteroarylhydrazines is demonstrated. Transformation of hydrazones to the desired systems was achieved by employing the oxidative cyclization with catalytic CuBr2 and oxone. This reaction condition is mild and selective, and a wide range of functional groups were able to sustain. An array of biologically important
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。
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 green one-pot process for the synthesis of 1,2,4-triazole-fused heterocycles using FeBr3 catalyst and hydrogen peroxide
作者:Yuliang Pan、Ruotong Tian、Yini Chen、Linyang Wang、Huilin Qin、Jian Wang
DOI:10.1016/j.tet.2023.133688
日期:2023.11
An environmentally benign oxidative cyclization utilizing FeBr3 catalyst and hydrogen peroxide as terminal oxidant is devised for one-pot synthesis of 1,2,4-triazole-fused heterocycles from commercially available aliphatic or (hetero)aromatic aldehydes and 2-hydrazinopyridine derivatives. The protocol features mild conditions, simple operation, air/water tolerance, short reaction time, and waste prevention
A metal-free iodine/TBHP-mediated oxidative C-N bond formation for the one-pot synthesis of N-fused 1,2,4-triazoles and related heterocycles via cyclization has been developed. This reaction which is amenable to scale-up affords the corresponding products with good to excellent yields and tolerates a wide range of functional groups. (C) 2018 Elsevier Ltd. All rights reserved.