The first nickel-catalyzed C–H arylations and alkenylations of imidazoles with phenol and enol derivatives are described.
第一个镍催化的咪唑与酚和烯醇衍生物的C-H芳基化和烯基化反应被描述了。
Unified Protocol for Fe-Based Catalyzed Biaryl Cross-Couplings between Various Aryl Electrophiles and Aryl Grignard Reagents
作者:Lei Wang、Yi-Ming Wei、Yan Zhao、Xin-Fang Duan
DOI:10.1021/acs.joc.9b00151
日期:2019.5.3
Ti(OEt)4/PhOM enabled a highly general iron-based catalyst system, which could efficiently catalyze the biaryl coupling reaction between various electrophiles (I, Br, Cl, OTs, OCONMe2, OSO2NMe2) and common or functionalized aryl Grignardreagents with high functional group tolerance. Selective couplings of aryl iodides and bromides over the corresponding oxygen-based electrophiles have been achieved, and
A General Approach towards Catechol and Pyrogallol through Ruthenium‐ and Palladium‐Catalyzed CH Hydroxylation by Weak Coordination
作者:Xinglin Yang、Yonghui Sun、Zhang Chen、Yu Rao
DOI:10.1002/adsc.201300999
日期:2014.5.5
An efficient ruthenium(II)‐ and palladium(II)‐catalyzed CH hydroxylation of aryl carbamates has been developed for the facile synthesis of catechols and pyrogallols. The reaction demonstrates excellent reactivity, regio‐ and chemoselectivity, good functional group compatibility and high yields. The practicality of this method has been proved by a gram‐scale synthesis.
Phosphane-free Suzuki–Miyaura Coupling of Aryl Imidazolesulfonates with Arylboronic Acids and Potassium Aryltrifluoroborates under Aqueous Conditions
作者:José Francisco Cívicos、Mohammad Gholinejad、Diego A. Alonso、Carmen Nájera
DOI:10.1246/cl.2011.907
日期:2011.9.5
Aryl imidazole-1-sulfonates are efficiently cross-coupled with arylboronic acids and potassium aryltrifluoroborates using only 0.5 mol % of oxime palladacycles 1 under aqueous conditions at 110 °C. Under these simple phosphane-free reaction conditions a wide array of biaryl derivatives has been prepared in high yields. This methodology allows in situ phenol sulfonation and one-pot Suzuki arylation as well as the employment of microwave irradiation conditions.
A Rh(III)-catalyzed multiple C–H bond activation/cyclization of phenol derivatives with alkynes was developed. Polyaryl-substituted naphthol derivatives, potentially useful as organic optoelectronic materials, were obtained in moderate to good yields.