<i>N</i>-Bromosuccinimide-Induced C–H Bond Functionalization: An Intramolecular Cycloaromatization of Electron Withdrawing Group Substituted 1-Biphenyl-2-ylethanone for the Synthesis of 10-Phenanthrenol
作者:Ya-Ting Jiang、Zhen-Zhen Yu、Ya-Kai Zhang、Bin Wang
DOI:10.1021/acs.orglett.8b01160
日期:2018.7.6
intramolecular cycloaromatization for the synthesis of 10-phenanthrenols from electron-withdrawing groupsubstituted 1-biphenyl-2-ylethanones is described. The in situ generated bromide was designed to act as an initiator for the radical C–H bond activation. An oxidative cross-dehydrogenative coupling reaction of a highly active C–H bond with an inert C–H bond readily occurs under mild conditions without
Using a catalytic amount of N-iodosuccinimide (NIS) in combination with O2 in air, an aerobic oxidative reaction was carried out to efficiently and scalably construct a series of 10-phenanthrenols under sunlight at room temperature. Mechanistic studies reveal that H2O2 generated in situ was responsible for the conversion of I2 to IOH as a potential initiator for later catalytic cycle.
使用催化量的N-碘代琥珀酰亚胺 (NIS) 与空气中的O 2结合,进行有氧氧化反应,以在室温下在阳光下有效且可扩展地构建一系列 10-菲酚。机理研究表明,原位产生的H 2 O 2负责将 I 2转化为 IOH,作为后期催化循环的潜在引发剂。
Rhodium-catalyzed cyclization of acceptor-substituted biphenyl α-diazoketones: a study of the substitution effect on chemoselectivity
作者:Kuo-Hsin Chen、Yi-Jung Chiang、Jia-Liang Zhu
DOI:10.1039/c8ob01489b
日期:——
rhodium(II)-catalyzed intramolecular cyclization. Among which, the α-acetyl, carboxylate and cyano substituted substrates show markedly different selectivity between aromatic substitution and aromatic cycloaddition processes, affording phenanthrol and/or benz[α]azulenone products in varying ratios. The selectivity is mainly directed by α-substitutions, and is also possibly influenced by the substituents
Synthesis of new derivatives of a representative o-quinone scaffold by reduction at the electrode
作者:Belen Batanero、Fructuoso Barba、Fernando Ranz、Isidoro Barba、Michail N. Elinson
DOI:10.1016/j.tet.2012.05.042
日期:2012.7
concomitant electrochemicalreduction of 9,10-phenanthrenequinone and benzenediazoniumtetrafluoroborate, under constant potential conditions (−0.5 V vs Ag/Ag+), has been performed in different organic solvents. An interesting entry to new C–C radical coupling products is here described. Another cathodic pathway where the anion radical intermediate acts as an EGB is also described. The electrochemical behaviour
在不同的有机溶剂中,在恒定电势条件下(-0.5 V对Ag / Ag +),进行了9,10-菲醌和四氟硼酸苯重氮的伴随电化学还原。这里介绍了一个新的C–C自由基偶联产品的有趣条目。还描述了其中阴离子自由基中间体充当EGB的另一种阴极途径。给出了系统的电化学行为和机理建议。