Visible‐Light‐Induced [4+2] Annulation of Thiophenes and Alkynes to Construct Benzene Rings
作者:Chunlan Song、Xin Dong、Zhongjie Wang、Kun Liu、Chien‐Wei Chiang、Aiwen Lei
DOI:10.1002/anie.201905971
日期:2019.8.26
The [4+2] annulation represents an elegant and versatile syntheticprotocol for the construction of benzene rings. Herein, a strategy for visible-light induced [4+2] annulation of thiophenes and alkynes, to afford benzene rings, is presented. Under simple and mild reaction conditions, the ready availability and structural diversity of thiophenes and alkynes permit the facile synthesis of several substituted
Palladacycles derived from arylphosphinamides for mild Suzuki–Miyaura cross-couplings
作者:Guo-Jie Wu、Fu-She Han、Yu-Long Zhao
DOI:10.1039/c5ra12742d
日期:——
of palladacycles, a wide variety of aryl bromides and boronicacids could be coupled very efficiently at ambient temperature and under air atmosphere without the need of external supporting ligands. Moreover, the mild conditions also allow for smooth coupling of electron-deficient, i.e., the less stable aryl triflates. In addition to the highly catalytic activity, the palladacyclic complexes can be
Arylketones as Aryl Donors in Palladium-Catalyzed Suzuki–Miyaura Couplings
作者:Zhen-Yu Wang、Biao Ma、Hui Xu、Xing Wang、Xu Zhang、Hui-Xiong Dai
DOI:10.1021/acs.orglett.1c03048
日期:2021.11.5
Herein, we report the arylation, alkylation, and alkenylation of aryl ketones via a palladium-catalyzed Suzuki–Miyaura cross-coupling reaction. The use of the pyridine-oxazoline ligand is the key to the cleavage of the unstrained C–C bond. The late-stage arylation of aryl ketones derived from drugs and natural products demonstrated the synthetic utility of this protocol.
Parallel Synthesis and Purification Using Anthracene-Tagged Substrates
作者:Xiang Wang、John J. Parlow、John A. Porco
DOI:10.1021/ol0065625
日期:2000.11.1
[reaction: see text] A new strategy for the synthesis and purification of synthetic intermediates is described using anthracene-tagged ester substrates in conjunction with an N-benzylmaleimide resin. Anthracene chemical tags permit use of standard solution-phase reaction conditions and reaction-monitoring techniques.