developed a B(C6F5)3catalyzedhydroarylation of terminalalkynes with various phenols at room temperature without adding any additives, leading to the synthesis of 2-gem-vinylphenols with good regio-selectivity. Those transformations featured a broad substrate scope with moderate yields. Mechanism studies indicated that those transformations proceeded through the activation of phenol by B(C6F5)3 with subsequent
B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
‐Catalyzed Hydroarylation of Aryl Alkynes for the Synthesis of 1,1‐Diaryl and Triaryl Substituted Alkenes
作者:Hui Chen、Liuzhou Gao、Xueting Liu、Guoqiang Wang、Shuhua Li
DOI:10.1002/ejoc.202101001
日期:2021.10.7
B(C6F5)3-catalyzed hydroarylation of both terminal and internal alkynes leads to 1,1-diaryl and triaryl substituted alkenes. A B(C6F5)3-phenol adduct mediated protonation mechanism is responsible for the formation of the related alkenes as well as the observed stereoselectivity.
B(C 6 F 5 ) 3 -催化的末端和内部炔烃的加氢芳基化产生1,1-二芳基和三芳基取代的烯烃。AB(C 6 F 5 ) 3 -苯酚加合物介导的质子化机制负责相关烯烃的形成以及观察到的立体选择性。
Rh(III)-catalyzed C–H activation-desymmetrization of diazabicycles using enol as directing group: A straightforward approach to difunctionalized cyclopentenes
作者:Yan Zhang、Tianbo Shang、Lisha Li、Yu He、Tingting Wen、Yanan Tu、Shanshan Wang、Dan Lin
DOI:10.1016/j.tetlet.2018.02.063
日期:2018.4
o-vinylphenols as an efficient approach to alkenyl-substituted aminocyclopentenes is reported. This protocol represents another classic example for direct C–H activation of terminal alkenes using enol as directing group. The reaction features the ease of the preparation of starting materials, fast and high efficiency, broad substrate scope and 100% atom economy, thus provides a valuable entry to synthesize
A highly atom-efficient synthetic protocol for hydroarylation of terminal-aryl alkynes and styrene through the regioselective CC bond formation via the electrophilic addition of naphthols and substituted phenols has been developed using alumina-sulfuric acid as a heterogeneous supported solid acid catalyst. This methodology shows excellent regioselectivity and affords the desired product in good to
Benzofurans from Benzophenones and Dimethylacetamide: Copper-Promoted Cascade Formation of Furan O1C2 and C2C3 Bonds Under Oxidative Conditions
作者:María J. Moure、Raul SanMartin、Esther Dominguez
DOI:10.1002/anie.201108513
日期:2012.3.26
benzofuran core through a cascade of copper‐catalyzed processes wherein the key carbon atom comes from the dimethylacetamide (DMA) solvent. Strong evidence for the participation of a Wacker cyclization catalyzed solely by copper is provided, not only in the title reaction from benzophenones but also from 2‐hydroxy‐α‐arylstyrene derivatives.