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
Synthesis of 2,4,6-Trisubstituted Pyridines by Oxidative Eosin Y Photoredox Catalysis
作者:Rajendra S. Rohokale、Burkhard Koenig、Dilip D. Dhavale
DOI:10.1021/acs.joc.6b00979
日期:2016.8.19
dye, was activated as a photoredox catalyst in the presence of molecular oxygen using visible light and, when it was used in the reaction of aryl ketones and benzyl amines, afforded good yields (52–87%) of 2,4,6-triarylpyridines (21 examples) at ambient temperature. The aryl groups at the 2- and 6-positions are derived from ketones, while benzyl amine plays the dual role of providing an aryl functionality
A highly efficient one‐pot synthesis of polysubstituted pyridine has been achieved through copper‐catalyzed oxidative sp3 C−H coupling of acetophenones with toluene derivatives. Besides, the polysubstituted benzene was obtained through copper‐catalyzed coupling of acetophenones. Both of the reactions exhibited a good functional group tolerance to produce a 2,4,6‐triphenylpyridine or 1,3,5‐triarylbenzene
A New Synthetic Pathway to Triphenylpyridines via Cascade Reactions Utilizing a New Iron-Organic Framework as a Recyclable Heterogeneous Catalyst
作者:Son H. Doan、Nhu K. Q. Tran、Phuc H. Pham、Vu H. H. Nguyen、Ngoc N. Nguyen、Phuong T. M. Ha、Shuang Li、Ha V. Le、Nhan T. H. Le、Thach N. Tu、Nam T. S. Phan
DOI:10.1002/ejoc.201900094
日期:2019.4.9
Iron‐based Metal‐organic framework (VNU‐22) was utilized as a recyclable heterogeneous catalyst in the synthesis of 2,4,6‐triphenylpyridines via cascadereactions.