approach for the synthesis of polysubstituted pyridines has been achieved through copper-catalyzed oxidative sp3 C–H coupling of oxime acetates with toluene derivatives. Besides, benzylamine and p-toluenesulfonylhydrazone were also introduced to react with oxime acetates to enrich the diversity of this synthetic method. These transformations provide highly flexible and facile preparation of substituted pyridines
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...
Copper-catalyzed coupling of oxime acetates with aldehydes offers a new strategy for the synthesis of highly substituted pyridines. This novel method tolerates a wide range of functionality and allows for rapid elaboration of the oxime acetates into a variety of substituted pyridines.
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。
The conversion of primary amines into olefins: a mild alternative to the Hofmann elimination
作者:Alan R. Katritzky、Azzahra M. El-Mowafy
DOI:10.1039/c39810000096
日期:——
Use of the pentacyclic pyrylium salt (1) allows a two-step conversion of the amine RR′CHCH2NH2 into RR′CCH2 in high yield under mild conditions.