Aqueous bile salt accelerated cascade synthesis of 1,2,3-triazoles from arylboronic acids
作者:Anirban Garg、Abdul Aziz Ali、Krishnaiah Damarla、Arvind Kumar、Diganta Sarma
DOI:10.1016/j.tetlet.2018.09.064
日期:2018.11
A facile, efficient and mild copper catalyzed strategy for cascade synthesis of various 1,4-disubstituted 1,2,3-triazoles from arylboronic acids, sodium azide and alkynes was developed by using aqueous bile salt NaDC solution as an accelerating medium. Low catalyst loading (only 1 mol% Cu source was sufficient for in situ generation of azide followed by azide–alkyne coupling), green solvent, use of
Eight-membered-ring diaminocarbenes bearing naphthalene moiety in the backbone: DFT studies, synthesis of amidinium salts, generation of free carbene, metal complexes, and solvent-free copper catalyzed azide–alkyne cycloaddition (CuAAC) reaction
作者:Gleb A. Chesnokov、Maxim A. Topchiy、Pavel B. Dzhevakov、Pavel S. Gribanov、Aleksandr A. Tukov、Victor N. Khrustalev、Andrey F. Asachenko、Mikhail S. Nechaev
DOI:10.1039/c6dt04484k
日期:——
eight-membered ringN-heterocycliccarbene (NHC) bearing a rigid naphthalene moiety in the backbone is reported for the first time. Stereoelectronic properties of 4,5-dihydro-1H-naphtho[1,8-ef][1,3]diazocin-3(2H)-ylidene (NaphtDHD) and smaller ring NHCs were theoretically studied at the DFT level. Amidinium salts were prepared from corresponding amidines and dibromides. Free carbene NaphtDHD-Dipp (Dipp
首次报道了在骨架中带有刚性萘部分的新型八元环N-杂环卡宾(NHC)。理论上在DFT水平上研究了4,5-二氢-1 H-萘[1,8- ef ] [1,3]二唑-3(2 H)-亚烷基(NaphtDHD)和较小的环NHC的立体电子性质。由相应的salts和二溴化物制备盐。通过用LiHMDS处理相应的盐,在溶液中生成了游离的卡宾NaphtDHD-Dipp(Dipp = 2,6-二异丙基苯基)。它在低温下在溶液中稳定,而在室温下则迅速分解。银(I)和铜(I合成了复合物,并在固态下对其结构进行了表征。铜(I)络合物[(NaphtDHD-Mes)CuBr](Mes =甲基1,2,4,6-三甲基苯基)在炔烃-叠氮化物环加成(CuAAC)反应中在无溶剂条件下表现出高催化活性。
Ag–NHC anchored on silica: an efficient ultra-low loading catalyst for regioselective 1,2,3-triazole synthesis
A silica-supported silver complex, Ag–NHC@SiO2, was prepared by an anchoring coordination technique, which was successfully employed for the click reaction under mild reaction conditions.
Synthesis of <sup>13</sup>N-labelled polysubstituted triazoles via Huisgen cycloaddition
作者:S. M. Joshi、V. Gómez-Vallejo、V. Salinas、J. Llop
DOI:10.1039/c6ra24670b
日期:——
the incorporation of 13N in the toolbox of PET chemists might be a valuable option for the preparation of new labelled compounds or incorporation of the label in different positions. Here we present the unprecedented radiosynthesis of 13N-labelled polysubstituted triazoles via Huisgen cycloaddition by reaction of 13N-labelled aromatic azides with alkyne derivatives and aldehydes. Six different 13N-labelled
由于其半衰期短(T 1/2 = 9.97分钟),历史上一直限制使用正电子发射极氮13(13 N )。但是,它的稳定同位素(14号氮和15号氮)存在于许多生物活性分子中。因此,在PET化学家的工具箱中掺入13 N可能是制备新标记化合物或在不同位置掺入标记的有价值的选择。在这里,我们介绍了13个N标记的芳族叠氮化物与炔烃衍生物和醛的反应,通过惠斯根环加成反应,空前地合成了13个N标记的多取代三唑。六种不同的13N标记的三唑已成功合成。经过合成过程的自动化和实验条件的优化,可以制备出一种具有高放射化学纯度和经衰减校正的放射化学产率为11±2%的三唑。获得的活性量应足以进行将来的体外和体内研究。这种新颖的方法可能会为放射性示踪剂的制备开辟新的途径,而使用其他更常规的正电子发射器则无法对其进行标记。
Copper(II) Acetylacetonate: An Efficient Catalyst for Huisgen-Click Reaction for Synthesis of 1,2,3-Triazoles in Water
An efficient and green copper(II) acetylacetonate‐catalyzed protocol for the Huisgen‐click reaction in water at 100 °C has been established. The protocol was not only suitable for the reaction between organic azides and alkynes, but also suitable for one‐pot three‐component reaction among alkyl halides, NaN3 and alkynes.