Nano CoFe<sub>2</sub>O<sub>4</sub> supported antimony(<scp>iii</scp>) as an efficient and recyclable catalyst for one-pot three-component synthesis of multisubstituted pyrroles
A novelmagnetic nano-CoFe2O4 supported Sb ([CoFe2O4@SiO2–DABCO–Sb]) was successfully constructed, which exhibited high catalytic activity for one-potthree-componentsynthesis of multisubstituted pyrroles in the reaction of amines, nitroolefin and 1,3-dicarbonyl compounds. The magneticheterogeneouscatalyst could be easily recovered using an external magnet and reused many times without significant
成功地构建了一种新型的磁性纳米CoFe 2 O 4负载的Sb([CoFe 2 O 4 @SiO 2 –DABCO-Sb]),该催化剂对多取代吡咯的一锅三组分合成具有很高的催化活性。胺,硝基烯烃和1,3-二羰基化合物。磁性非均相催化剂可以使用外部磁体容易地回收,并且可以多次重复使用而不会显着降低催化活性。
The highly chemoselective transfer hydrogenation of the carbon–carbon double bond of conjugated nitroalkenes by a rhodium complex
作者:Jing Xiang、Er-Xiao Sun、Chun-Xia Lian、Wei-Cheng Yuan、Jin Zhu、Qiwei Wang、Jingen Deng
DOI:10.1016/j.tet.2012.04.028
日期:2012.6
Chemoselective transfer hydrogenation of conjugatednitroalkenes catalyzed by [RhCl2Cp∗]2–diamine complex (Cp∗=η5-C5Me5) using HCOOH/Et3N (5:2) (TEAF) as a hydrogen source was realized. A variety of nitrostyrenes, β-methyl nitrostyrenes, and 3-methyl-4-nitro-5-alkenyl-isoxazoles were reduced smoothly in good to excellent yields in short reaction time. Other functional groups are inert under the reaction
DABCO-promoted synthesis of pyrazoles from tosylhydrazones and nitroalkenes
作者:Meng Tang、Wen Zhang、Yuanfang Kong
DOI:10.1039/c3ob41435c
日期:——
An efficient synthesis of pyrazoles fromtosylhydrazones and nitroalkenes was developed. In comparison with the previously reported 1,3-dipolar cycloaddition reaction of diazo compounds with electron-deficient alkenes or alkynes, this methodology proceeded with a sequential Baylis–Hillman/intramolecular cyclization mechanism and a variety of reversed regioselectivity products were prepared in good
Iron-Catalyzed Tandem One-Pot Addition and Cyclization of the Blaise Reaction Intermediate and Nitroolefins: Synthesis of Substituted NH-Pyrroles from Nitriles
The iron‐catalyzed addition and cyclization of the Blaisereactionintermediate and nitroolefins to synthesize highly functionalized NH‐pyrroles in a tandem one‐pot manner fromnitriles has been developed. This reaction shows good functional group tolerance and affords a broad spectrum of substituted NH‐pyrroles in good yields.
Synthesis of 2 or 3-(hetero)aryl pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition ofN-aminopyridine with β-nitrostyrenes followed byin situdenitration under metal-free and mild conditions are described.