Fluorenone Synthesis by Palladacycle-Catalyzed Sequential Reactions of 2-Bromobenzaldehydes with Arylboronic Acids
摘要:
A new, anionic four-electron donor-based (type I) palladacycle-catalyzed sequential reaction of 2-bromobenzaldehydes with arylboronic acids based on the addition reaction, cyclization via C-H activation-oxidation sequence is described. Our study provided an efficient access to a variety of substituted fluorenones/indenofluorenediones from readily available arylboronic acids and 2-bromobenzaldehydes.
Efficient palladium-catalyzed C(sp<sup>2</sup>)–H activation towards the synthesis of fluorenes
作者:Juan Song、Yali Li、Wei Sun、Chenglong Yi、Hao Wu、Haotian Wang、Keran Ding、Kang Xiao、Chao Liu
DOI:10.1039/c6nj02033j
日期:——
protocol for the synthesis of fluorene derivatives has been developed through palladium-catalyzed cyclization of 2′-halo-diarylmethanes via activation of arylic C–H bonds. The reactions occurred smoothly and allowed both electron-rich and electron-deficient substrates to convert into their corresponding fluorenes in good to excellent yields. Studies revealed that this Pd-catalyzedcyclization was also available
Palladium(II)‐Catalyzed Intermolecular Cascade Cyclization of Methylenecyclopropanes with Aromatic Alkynes: Construction of Spirocyclic Compounds Containing Indene and 1,2‐Dihydronaphthalene Moieties
作者:Wei Fang、Yin Wei、Min Shi
DOI:10.1002/adsc.201900327
日期:2019.7.11
A palladium(II)‐catalyzed intermolecular cascade cyclization of methylenecyclopropanes with aromatic alkynes is reported in this paper. The reaction involves a migratory insertion of alkyne, an intramolecular Heck‐type reaction, and β‐H elimination, providing a series of spirocyclic compounds containing indene and 1,2‐dihydronaphthalene moieties in moderate to excellent yields upon heating.
Borylation of Olefin C–H Bond via Aryl to Vinyl Palladium 1,4-Migration
作者:Tian-Jiao Hu、Ge Zhang、Ya-Heng Chen、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1021/jacs.5b11990
日期:2016.3.9
The aryl to vinyl palladium 1,4-migration was realized for the first time. The generated alkenyl palladium species was trapped by diboron reagents under Miyaura borylation conditions, providing a new method to synthesize β,β-disubstituted vinylboronates. The excellent regioselectivity and broad substrate scope were observed for this novel transformation.
Bismuth-catalyzed synthesis of anthracenes via cycloisomerization of o-alkynyldiarylmethane
作者:Jungmin Park、Hyuck Choi、Deug-Chan Lee、Kooyeon Lee
DOI:10.1016/j.tetlet.2015.10.111
日期:2015.12
In this study, anthracenes were efficiently synthesized from o-alkynyldiarylmethane using a novel method that exploits the synergistic effect between Bi(OTf)3 as the catalyst, and trifluoroacetic acid (TFA). Through this reaction, we achieved the rapid and efficient synthesis of anthracenes bearing various functional groups under mild conditions.