A novel and facile iron-catalyzed cyclization of ketoximeacetates and aldehydes for the green synthesis of substituted pyridines has been developed. In the presence of a FeCl3 catalyst, the reaction...
A new route to triphenylpyridines utilizing ketoximes as building blocks via cascade reactions under iron-organic framework catalysis
作者:Vu H.H. Nguyen、Son H. Doan、Tram T. Van、Phuc H. Pham、Tran T.N. Nguyen、Ngoc N. Nguyen、Thach N. Tu、Nam T.S. Phan
DOI:10.1002/aoc.4841
日期:2019.4
framework VNU‐20 was utilized as a heterogeneous catalyst for cascadereactions between ketoximes and dibenzyl ether to produce 2,4,6‐triphenylpyridines. Additionally, benzyl alcohol and (dimethoxymethyl)benzene could be used as an alternative starting materials for the transformation. The oxidant exhibited a remarkable impact on the reactions, and di‐tert‐butylperoxide was the most appropriate candidate
Synthesis of triphenylpyridines <i>via</i> an oxidative cyclization reaction using Sr-doped LaCoO<sub>3</sub> perovskite as a recyclable heterogeneous catalyst
作者:Thu N. M. Le、Son H. Doan、Phuc H. Pham、Khang H. Trinh、Tien V. Huynh、Tien T. T. Tran、Minh-Vien Le、Tung T. Nguyen、Nam T. S. Phan
DOI:10.1039/c9ra04096j
日期:——
strontium-doped lanthanum cobaltite perovskite was prepared via a gelation and calcination approach and used as a heterogeneouscatalyst for the synthesis of triphenylpyridines via the cyclization reaction between ketoximes and phenylacetic acids. The transformation proceeded via the oxidative functionalization of the sp3 C–H bond in phenylacetic acid. The La0.6Sr0.4CoO3 catalyst demonstrated a superior performance
通过凝胶化和煅烧的方法制备了La 0.6 Sr 0.4 CoO 3锶掺杂的钴酸镧钙钛矿,并将其用作通过酮肟和苯乙酸之间的环化反应合成三苯基吡啶的非均相催化剂。该转化是通过苯乙酸中 sp 3 C-H 键的氧化官能化进行的。 La 0.6 Sr 0.4 CoO 3催化剂表现出优于原始LaCoCO 3以及一系列均相和非均相催化剂的性能。此外,La 0.6 Sr 0.4 CoO 3催化剂很容易回收和再利用,而其催化效率没有明显下降。据我们所知,酮肟与容易获得的苯乙酸的组合是新颖的。
Copper-Catalyzed Formal C–N Bond Cleavage of Aromatic Methylamines: Assembly of Pyridine Derivatives
copper-catalyzed C–N bond cleavage of aromatic methylamines was developed to construct pyridine derivatives. With neat conditions and facile operation, the fragment-assembling strategy affords a broad range of 2,4,6-trisubstituted pyridines in up to 95% yield from simple and readily available starting materials. Interestingly, when pyridin-2-yl methylamine was employed as the substrate, α-alkylation reaction
Metal-Free Synthesis of 2,4,6-Trisubstituted Pyridines via Iodine-Initiated Reaction of Methyl Aryl Ketones with Amines under Neat Heating
作者:Ze Zhang、Hui Xu、Ji-Chao Zeng、Fang-Jian Wang
DOI:10.1055/s-0036-1588380
日期:——
HI-catalyzed) condensation of methyl aryl ketones with amines and the following cyclization-aerobic oxidation. Large-scale synthesis and mechanistic investigation were also performed. A neat heating protocol has been developed for metal-free synthesis of various 2,4,6-trisubstituted pyridines via iodine-initiated (in situ generated HI-catalyzed) condensation of methyl aryl ketones with amines and the following