Programmed Selective sp2 C–O Bond Activation toward Multiarylated Benzenes
摘要:
A variety of important multiarylated benzenes were efficiently synthesized from phloroglucinol derivatives 1 through sequential cross-couplings via Pd-catalyzed C-OTs, Ni-catalyzed C-OC(O)NEt2, and C-OMe bond activation. High selectivity was achieved based on the rational design and inherent diversity in the reactivity of different C-O bonds.
Transition‐Metal‐Free Oxidative Cross‐Coupling of Tetraarylborates to Biaryls Using Organic Oxidants
作者:Carolin Gerleve、Armido Studer
DOI:10.1002/anie.202002595
日期:2020.9
tetraarylborates undergo selective (cross)‐coupling through oxidation with Bobbitt's salt to give symmetric and unsymmetric biaryls. The organic oxoammonium salt can be used either as a stoichiometric oxidant or as a catalyst in combination with in situ generated NO2 and molecular oxygen as the terminal oxidant. For selected cases, oxidative coupling is also possible with NO2/O2 without any additional
容易制备的四芳基硼酸盐通过用博比特盐氧化进行选择性(交叉)偶联,得到对称和不对称的联芳基化合物。有机氧铵盐可用作化学计量氧化剂或与原位产生的NO 2和作为末端氧化剂的分子氧组合用作催化剂。对于某些情况,也可以使用 NO 2 /O 2进行氧化偶联,无需任何额外的氮氧自由基助催化剂。四芳基硼酸盐的无过渡金属催化氧化配体交叉偶联是前所未有的,所引入的方法提供了获得各种联芳基和杂联芳基系统的途径。
N-Heterocyclic Carbene-Catalyzed Construction of 1,3,5-Trisubstituted Benzenes from Bromoenals and α-Cyano-β-methylenones
作者:Chun-Lin Zhang、Song Ye
DOI:10.1021/acs.orglett.6b03306
日期:2016.12.16
A direct and efficient approach to 1,3,5-trisubstituted benzenes has been developed via N-heterocycliccarbene-catalyzed [2 + 4] annulation of α-bromoenals and α-cyano-β-methylenones. The reaction worked well for both aryl- and alkylenones.
DBU-Mediated Construction of 1,3,5-Trisubstituted Benzenes via Annulation of α,β-Unsaturated Carboxylic Acids and α-Cyano-β-methylenones
作者:Chun-Lin Zhang、Zhao-Fei Zhang、Zi-Hao Xia、You-Feng Han、Song Ye
DOI:10.1021/acs.joc.8b01740
日期:2018.10.19
A DBU-mediated synthesis of 1,3,5-trisubstituted benzenes was developed via the [2 + 4] annulation of in situ activated α,β-unsaturatedcarboxylic acids and α-cyano-β-methylenones. The dual role of DBU as Brønsted base and nucleophilic Lewis base is the key for the success of the reaction.
Synthesis of Asymmetric Triarylbenzenes by Using SOCl<sub>2</sub>-C<sub>2</sub>H<sub>5</sub>OH Reagent
作者:Zhiguo Hu、Jun Liu、Gongan Li、Zhibing Dong、Wei Li
DOI:10.1002/jccs.200400089
日期:2004.6
A simple and efficient method for synthesis of asymmetric branched functionalized triarylbenzenes is presented. The dypnone reacting with different substituted acetophenones, corresponding asymmetric 1,3,5-triarylbenzenes were obtained in the presence of catalytic amounts of sulfurous oxychloride in anhydrous ethanol.
Assembly of unsymmetrical 1,3,5-triarylbenzenes <i>via</i> tandem reaction of β-arylethenesulfonyl fluorides and α-cyano-β-methylenones
作者:Fang Zhang、Yi An、Jichang Liu、Guangfen Du、Zhihua Cai、Lin He
DOI:10.1039/d2nj01549h
日期:——
A transition-metal-free method has been proposed for the synthesis of unsymmetrical 1,3,5-triarylbenzenes via a tandem Diels–Alder cycloaddition/SuFEx/elimination process.