Palladium-Catalyzed Triazolopyridine Synthesis: Synthesis of 7-Chloro-3-(2-Chlorophenyl)-1,2,4-Triazolo[4,3-a]Pyridine
摘要:
Chloramine-T is thermally unstable and heating of chloramines-T beyond the temperature disclosed in this procedure should not be conducted without further safety evaluation. Hydrazine should be handled in a fume hood as it is an animal carcinogen and has been identified it as a potential human carcinogen. In addition, anhydrous hydrazine is potentially explosive, especially in contact with metals, and should only be handled as its hydrate.
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 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.
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
Synthesis of 1,2,4-Triazoles,<i>N</i>-Fused 1,2,4-Triazoles and 1,2,4-Oxadiazoles<i>via</i>Molybdenum Hexacarbonyl-Mediated Carbonylation of Aryl Iodides
protocol has been developed for the synthesis of 1,2,4‐triazoles, N‐fused 1,2,4‐triazoles and 1,2,4‐oxadiazoles using molybdenum hexacarbonyl where, for the first time, molybdenum hexacarbonyl acts as a convenient and reliable solid source of carbon monoxide. This procedure provides an easy access to a library of 1,2,4‐triazole, N‐fused 1,2,4‐triazole and 1,2,4‐oxadiazole derivatives in fair to good
Facile one-pot synthesis of N-fused 1,2,4-triazoles via oxidative cyclization using manganese dioxide
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1007/s10593-019-02400-0
日期:2018.12
A facile one-pot synthesis of N-fused1,2,4-triazoles from heterocyclic hydrazines and aldehydes is reported. The reaction is efficiently promoted by manganese dioxide to afford the desired products mostly in high yields and in relatively short times. The mild nature of the synthesis, cheap oxidizing agent, and short reaction time are notable advantages of the developed protocol. This protocol is effective