在温和且可扩展的电解条件下,已开发出无金属和无氧化剂的分子内脱氢N–N键的形成。从容易获得的N-(2-吡啶基)am有效地合成了各种有价值的1,2,4-三唑并[1,5- a ]吡啶。反应在恒定电流条件下,在简单的不分隔电池中进行,其中n Bu 4 NBr作为氧化还原介体和电解质。该方案适用于抗糖尿病化合物关键中间体的有效合成。
Cu(II)-Catalyzed C–H Amidation/Cyclization of Azomethine Imines with Dioxazolones via Acyl Nitrenes: A Direct Access to Diverse 1,2,4-Triazole Derivatives
作者:Xiang Liu、Wen Li、Wenxuan Jiang、Hao Lu、Jiali Liu、Yijun Lin、Hua Cao
DOI:10.1021/acs.orglett.1c04044
日期:2022.1.21
We report a Cu(II)-catalyzed C–H amidation/cyclization of azomethine imines with dioxazolones as acyl nitrene transfer reagents under additive- and ligand-free conditions. An array of 1,2,4-triazolo[1,5-a]pyridine derivatives were afforded in moderate to good yields with excellent functional group tolerance. In addition, scale-up reaction and photoluminescence properties were discussed.
我们报告了在无添加剂和无配体条件下,Cu(II) 催化的 C-H 酰胺化/环化偶氮甲碱亚胺与二恶唑酮作为酰基氮烯转移试剂。一系列 1,2,4-三唑并[1,5- a ] 吡啶衍生物以中等至良好的产率提供,具有优异的官能团耐受性。此外,还讨论了放大反应和光致发光特性。
Mechanochemical Synthesis of 1,2,4‐Triazoles via a [3+2] Cycloaddition of Azinium‐
<i>N</i>
‐Imines and Nitriles
作者:Baofu Zhu、Wen Li、Haixin Chen、Minjian Wu、Jijing Hu、Hua Cao、Xiang Liu
DOI:10.1002/adsc.202200463
日期:2022.9.6
We report here a mechanochemical Cu-catalyzed [3+2] cycloaddition of azinium-N-imines with nitriles under solventless grinding conditions. Various 1,2,4-triazolos derivatives were obtained in 51–80% yields. The developed protocol offers advantages in functional-group compatibility, scalability, no use of solvents, shorter reaction time, and without external heating. In addition, heterocyclic N-imines
我们在此报告了在无溶剂研磨条件下机械化学 Cu 催化的 [3+2] 氮鎓-N-亚胺与腈的环加成反应。以 51-80% 的收率获得了各种 1,2,4-三唑衍生物。开发的协议在官能团兼容性、可扩展性、不使用溶剂、反应时间更短以及无需外部加热等方面具有优势。此外,杂环N-亚胺如喹啉鎓和异喹啉鎓盐也是合适的底物,从而产生1,2,4-三唑并[1,5- a ]喹啉和1,2,4-三唑并[5,1 - a ] 异喹啉衍生物在机械化学条件下。
Intramolecular electrochemical dehydrogenative N–N bond formation for the synthesis of 1,2,4-triazolo[1,5-<i>a</i>]pyridines
scalable electrolytic conditions. Various valuable 1,2,4-triazolo[1,5-a]pyridines were synthesized efficiently from the readily available N-(2-pyridyl)amidines. The reactions were conducted in a simple undivided cell under constant current conditions with nBu4NBr as both the redox mediator and the electrolyte. This protocol was applied to the efficient synthesis of key intermediates for anti-diabetic compounds
在温和且可扩展的电解条件下,已开发出无金属和无氧化剂的分子内脱氢N–N键的形成。从容易获得的N-(2-吡啶基)am有效地合成了各种有价值的1,2,4-三唑并[1,5- a ]吡啶。反应在恒定电流条件下,在简单的不分隔电池中进行,其中n Bu 4 NBr作为氧化还原介体和电解质。该方案适用于抗糖尿病化合物关键中间体的有效合成。