萘并[1,2- b ]呋喃1a - f,萘并[2,1- b ]呋喃2a - f,苯并[1,2- b:5,4- b ']双呋喃3a - b,苯并[1,通过相应的邻烷氧基苯并芳基芳烃的碱催化环化反应合成了2- b:4,5- b ']二呋喃4a - b和苯并[1,2- b:4,3- b ']二呋喃5a - b衍生品。该Øα-烷氧基苯甲酰基芳烃是由邻羟基苯甲酰基芳烃的醚化反应制得的,该反应是通过在氯化铝存在下甲氧基芳烃与苯甲酰氯的反应或通过芳基苯甲酸酯的光-弗里斯重排而制备的。
Electrochemical Oxidative [4+2] Annulation for the π‐Extension of Unfunctionalized Heterobiaryl Compounds
作者:Xia Hu、Lei Nie、Guoting Zhang、Aiwen Lei
DOI:10.1002/anie.202003656
日期:2020.8.24
biological activities, regioselective access to fused aromatic compounds is significantly important in the field of organic materials and pharmaceutical science. Herein, we developed electrochemical oxidative [4+2] annulationreactions of heterobiaryl compounds with alkynes or alkenes, leading to the formation of several polycyclic heteroaromatic compounds. This electrosynthetic methodology serves for
An efficient and environmentally benign electrochemical oxidative radical C–H sulfonylation of arenes/heteroarenes was developed in this work. A series of significant diarylsulfones were prepared under mild catalyst- and exogenous-oxidant-free reaction conditions, which efficiently avoid the issues of desulfonylation or over-reduction of sulfonyl groups.
Nickel-Catalyzed Intramolecular Nucleophilic Addition of Aryl Halides to Aryl Ketones for the Synthesis of Benzofuran Derivatives
作者:Chen-Liang Deng、Xiao-Rui Zhu
DOI:10.1055/s-0040-1706662
日期:2021.5
A nickel-catalyzed intramolecularnucleophilicaddition reaction of aryl halides to arylketones for the formation of benzofuran derivatives has been developed. A number of substrates bearing electron-donating or electron-withdrawing groups were subjected to the standard reaction conditions, giving the corresponding products in moderate to good yields.
Synthesis of benzofurans from the cyclodehydration of α-phenoxy ketones mediated by Eaton’s reagent
作者:Zhanwei Ma、Min Zhou、Lin Ma、Min Zhang
DOI:10.1177/1747519820907244
日期:2020.7
acid) is used to prepare 3-substituted or 2,3-disubstituted benzofurans with moderate to excellent yields under mild conditions. The method provides a facile access to benzofurans from readily available starting materials such as phenols and α-bromo ketones. The reaction is highly efficient, which is attributed to the good reactivity and fluidity of Eaton’s reagent. The reaction can be applied to prepare
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。