Palladium-Catalyzed Coupling of Aldehyde-Derived Hydrazones: Practical Synthesis of Triazolopyridines and Related Heterocycles
作者:Oliver R. Thiel、Michal M. Achmatowicz、Andreas Reichelt、Robert D. Larsen
DOI:10.1002/anie.201001999
日期:2010.11.2
The palladium‐catalyzed intermolecular coupling of aldehyde‐derived hydrazones with chloroazines, followed by oxidative cyclization under mild conditions afforded access to a broad variety of bicyclic heterocyclic scaffolds (see scheme) that have potential for use in drug discovery.
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。