Electrophilic halogenation is used to produce a wide variety of halogenated compounds. Previously reported methods have been developed mainly using a reagent‐based approach. Unfortunately, a suitable “catalytic” process for halogen transfer reactions has yet to be achieved. In this study, arylamines have been found to generate an N‐halo arylamine intermediate, which acts as a highly reactive but selective catalytic
Dichloro-Bis(aminophosphine) Complexes of Palladium: Highly Convenient, Reliable and Extremely Active Suzuki-Miyaura Catalysts with Excellent Functional Group Tolerance
作者:Jeanne L. Bolliger、Christian M. Frech
DOI:10.1002/chem.200903309
日期:2010.4.6
systems, is a highlyconvenient, reliable, and extremelyactive Suzuki catalyst with excellentfunctionalgrouptolerance that enables the quantitative coupling of a wide variety of activated, nonactivated, and deactivated and/or sterically hindered functionalized and heterocyclic aryl and benzyl bromides with only a slight excess (1.1–1.2 equiv) of arylboronic acid at 80 °C in the presence of 0.2 mol % of
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
less‐reactive β position of thiophenes was previously inaccessible to direct functionalization. However, the β selectivity observed with the catalytic system PdCl2/POCH(CF3)2}3/Ag2CO3 in the arylation of thiophenes with iodoarenes (see scheme) is a remarkably general phenomenon applicable to unsubstituted, monosubstituted, and disubstituted thiophene derivatives, as well as thiophene‐containing fused aromatic
开放获取:通常无法直接将噻吩的反应性降低的噻吩的β位置进行直接功能化。但是,在噻吩与碘代芳烃的芳基化反应中,催化体系PdCl 2 / P OCH(CF 3)2 } 3 / Ag 2 CO 3所观察到的β选择性是一种显着的普遍现象,适用于未取代的,单取代的,和二取代的噻吩衍生物,以及含噻吩的稠合芳族化合物。