Palladium catalyzed C5-arylation of 2-fused triazole substituted thiophene and furan using aryl iodide through C H activation strategy
摘要:
Pd-catalyzed arylation of 2-fused triazole substituted thiophene and furan using aryl iodide through C-H activation is reported. It is found that the arylation occurs selectively at C-5 position of the thiophene and furan. Moreover, the nitrogens in the fused 1,2,4-thazole core were assisting neither N-directed arylation nor arylation in the triazole. (C) 2014 Elsevier B.V. All rights reserved.
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。
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。
1,1′-Carbonyldiimidazole (CDI) Mediated Coupling and Cyclization To Generate [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Kyle D. Baucom、Siân C. Jones、Scott W. Roberts
DOI:10.1021/acs.orglett.5b03589
日期:2016.2.5
An operationally efficient CDI mediated tandem coupling and cyclization reaction to generate [1,2,4]triazolo[4,3-a]pyridines has been reported. The reaction conditions and scope were investigated, and the methodology was demonstrated in batch mode as well as in a continuous process.
已经报道了可操作有效的CDI介导的串联偶联和环化反应以生成[1,2,4]三唑并[4,3- a ]吡啶。研究了反应条件和范围,并以分批方式以及连续过程证明了该方法。