Rapid Access to Nanographenes and Fused Heteroaromatics by Palladium‐Catalyzed Annulative π‐Extension Reaction of Unfunctionalized Aromatics with Diiodobiaryls
作者:Wataru Matsuoka、Hideto Ito、Kenichiro Itami
DOI:10.1002/anie.201707486
日期:2017.9.25
Efficient and rapidaccess to nanographenes and π‐extended fused heteroaromatics is important in materials science. Herein, we report a palladium‐catalyzed efficient one‐step annulative π‐extension (APEX) reaction of polycyclic aromatic hydrocarbons (PAHs) and heteroaromatics, producing various π‐extended aromatics. In the presence of a cationic Pd complex, triflic acid, silver pivalate, and diiodobiaryls
Intermolecular Oxidative Friedel–Crafts Reaction Triggered Ring Expansion Affording 9,10-Diarylphenanthrenes
作者:Lu Yang、Ilya D. Gridnev、Masahiro Terada、Tienan Jin
DOI:10.1021/acs.orglett.0c03283
日期:2020.11.20
A novel intermolecular tandem oxidative aromatic coupling between arylidene fluorenes and unfunctionalized aromatics mediated by a DDQ/TFA oxidation system has been developed for the construction of 9,10-diarylphenanthrenes (DAPs). The formation of a benzylic carbocation species possessing a quaternary sp3-carbon center on the fluorene moiety by an intermolecular oxidative Friedel–Crafts reaction of
Palladium-Catalyzed Annulation of<i>vic</i>-Bis(pinacolatoboryl)alkenes and -phenanthrenes with 2,2′-Dibromobiaryls: Facile Synthesis of Functionalized Phenanthrenes and Dibenzo[<i>g</i>,<i>p</i>]chrysenes
Palladium-catalyzed double cross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls: annulative approach to functionalized polycyclic aromatic hydrocarbons
This study demonstrates that the doublecross-coupling reaction of 1,2-bis(pinacolatoboryl)alkenes and -arenes with 2,2′-dibromobiaryls proceeds smoothly with the aid of a catalytic amount of Pd(PPh3)4 in the presence of excess base to give a variety of polycyclic aromatic hydrocarbons, such as phenanthrenes, [5]helicene, dithienobenzenes, triphenylenes, dibenzo[g,p]chrysenes, and triphenyleno[1,2-b:4
这项研究表明,在催化量的Pd(PPh 3)4存在下,1,2-双(频哪醇硼基)烯烃和-芳烃与2,2'-二溴联芳基的双交叉偶联反应可以顺利进行。过量的碱可得到各种多环芳烃,例如菲,[5]螺旋烯,二硫代苯,三苯撑,二苯并[ g,p ],和三苯并[1,2- b:4,3- b ']二噻吩好到高产。值得注意的是,使用2,2'-二溴八氟联苯作为亲电试剂的环化反应提供了否则难以合成的八氟菲和半氟化二苯并[ g,p] chrysenes高产。