A cascade iridium-catalysed oxindolesynthesis was achieved using pyridyl-protected anilines and bis(2,2,2-trifluoroethyl) 2-diazomalonate. The developed protocol is simple and scalable, and has a broad scope and excellent regioselectivity. The pyridyl directing group can easily be removed. The method was further extended to give C-7-functionalized oxindole derivatives in a straightforward manner.
Buchwald-Hartwig Amination of (Hetero)aryl Chlorides by Employing Mor-DalPhos under Aqueous and Solvent-Free Conditions
作者:Bennett J. Tardiff、Mark Stradiotto
DOI:10.1002/ejoc.201200510
日期:2012.7
catalyst system in the Buchwald–Hartwigamination of (hetero)arylchlorides with primary or secondary amines conducted either underaqueousconditions without the use of co-solvents and/or surfactants or undersolvent-freeconditions (52 examples). We have established that reactions of this type can be conducted without the rigorous exclusion of air, and in the case of the solvent-free reactions, we have
我们报告了 [Pd(cinnamyl)Cl]2/Mor-DalPhos 催化剂体系在(杂)芳基氯化物与伯胺或仲胺的 Buchwald-Hartwig 胺化中的应用,该胺化反应在水性条件下进行,不使用共溶剂和/或表面活性剂或在无溶剂条件下(52 个例子)。We have established that reactions of this type can be conducted without the rigorous exclusion of air, and in the case of the solvent-free reactions, we have demonstrated that appropriately selected liquid and solid reagents can be employed successfully.
Ruthenium-Catalyzed Remote C–H Sulfonylation of <i>N</i>-Aryl-2-aminopyridines with Aromatic Sulfonyl Chlorides
作者:Balu Ramesh、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.7b03051
日期:2017.11.3
A ruthenium-catalyzedremote sulfonylation at the C5 position of the pyridine group of N-aryl-2-aminopyridines with aromatic sulfonyl chlorides is described. The mechanistic and deuterium labeling studies clearly reveal that the ruthenametallacycle is a key intermediate in the reaction, which forms via the C–H bond activation. The DFT calculation supports that the C5 position of the 2-aminopyridine
A copper modified phosphorus doped g-C3N4 (Cu/P-CN) has been prepared and identified as an efficient catalyst for the synthesis of N-arylpyridin-2-amine derivatives by the reaction of 2-aminopyridine and aryl boronic acid under the irradiation of blue light.
Tunable Electrochemical C−N versus N−N Bond Formation of Nitrogen‐Centered Radicals Enabled by Dehydrogenative Dearomatization: Biological Applications
Herein, an environmentally friendly electrochemical approach is reported that takes advantage of the captodative effect and delocalization effect to generate nitrogen‐centered radicals (NCRs). By changing the reaction parameters of the electrode material and feedstock solubility, dearomatization enabled a selective dehydrogenative C−N versus N−Nbondformation reaction. Hence, pyrido[1,2‐a ]benzimidazole
本文报道了一种环境友好的电化学方法,该方法利用俘获作用和离域作用产生氮中心自由基(NCR)。通过改变电极材料的反应参数和原料溶解度,脱芳香化使选择性脱氢的CN与NN键形成反应成为可能。因此,吡啶[1,2- a ]苯并咪唑和四芳基肼构架是通过具有广泛普遍性的可持续的无过渡金属和外源氧化剂的策略制备的。生物活性测定表明,吡啶并[1,2- a ]苯并咪唑类化合物具有抗微生物活性和对人类癌细胞的细胞毒性。化合物21具有良好的光化学性质,具有大的斯托克斯位移(约130 nm),并成功应用于亚细胞成像。初步的机理研究和密度泛函理论(DFT)计算揭示了可能的反应途径。