A Convoluted Polyvinylpyridine‐Palladium Catalyst for Suzuki‐Miyaura Coupling and C−H Arylation
作者:Aya Ohno、Takuma Sato、Toshiaki Mase、Yasuhiro Uozumi、Yoichi M. A. Yamada
DOI:10.1002/adsc.202000742
日期:2020.11.4
and reusablesupportedcatalysts for Suzuki‐Miyaura coupling and catalytic C−H arylation is important for fundamental and applied chemistry, with these reactions being used to produce medical compounds and functional materials. Herein, we found that a mesoporous composite made of a linear poly(4‐vinylpyridine) and tetrachloropalladate acted as a dual‐mode catalyst for a variety of cross‐coupling reactions
Trisulfur Radical Anion as the Key Intermediate for the Synthesis of Thiophene via the Interaction between Elemental Sulfur and NaO<i>t</i>Bu
作者:Guoting Zhang、Hong Yi、Hong Chen、Changliang Bian、Chao Liu、Aiwen Lei
DOI:10.1021/ol503015b
日期:2014.12.5
A facile base-promoted sulfur-centered radical generation mode and a single-step protocol for the synthesis of thiophene derivatives using 1,3-diynes via the interaction between elemental sulfur and NaOtBu has been reported. EPR experiments revealed that the trisulfur radicalanion acts as a key intermediate of this process. A plausible mechanism has been proposed.
据报道,一种简便的碱促进的以硫为中心的自由基生成方式和一种通过元素硫与NaO t Bu相互作用使用1,3-二炔合成噻吩衍生物的单步操作方案。EPR实验表明,三硫自由基阴离子是该过程的关键中间体。已经提出了一种合理的机制。
A NOVEL PHOTOREARRANGEMENT OF 2,5-DIARYL-1,4-DITHIIN-1,1-DIOXIDE ACCOMPANIED BY EXTRUSION OF SULFUR DIOXIDE
作者:Keiji Kobayashi、Kiyoshi Mutai
DOI:10.1246/cl.1983.1461
日期:1983.9.5
Photolysis of the title compound afforded 2,5-diarylthiophene. The mechanism involving the valence isomerization to thioketone was supported by the photolysis in n-butylamine, which gave pyrrole derivatives.
Copper(I)-Catalyzed Synthesis of 2,5-Disubstituted Furans and Thiophenes from Haloalkynes or 1,3-Diynes
作者:Huanfeng Jiang、Wei Zeng、Yibiao Li、Wanqing Wu、Liangbing Huang、Wei Fu
DOI:10.1021/jo300692d
日期:2012.6.1
A regioselective synthesis of 2,5-disubstitutedfurans using copper(I) catalyst from haloalkynes in a one-pot procedure has been reported. This chemistry proceeds through the hydration reaction of 1,3-diynes, which can be readily prepared from the coupling reaction of haloalkynes in the presence of CuI. The procedure also can be used for the facile synthesis of 2,5-disubstituted thiophenes.