Visible-Light-Promoted Iron-Catalyzed <i>N</i>-Arylation of Dioxazolones with Arylboronic Acids
作者:Jing-Jing Tang、Xiaoqiang Yu、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acscatal.1c04538
日期:2021.11.19
A visible-light-promoted and simple iron salt-catalyzed N-arylation was achieved efficiently under external photosensitizer-free conditions. Arylboronic acids and bench-stable dioxazolones were used for this cross-coupling reaction. This reaction features high reactivity, wide substrate scope, good functional group tolerance, simple operation procedure, and mild reaction conditions. Preliminary mechanistic
Ir(III)/MPAA-Catalyzed Mild and Selective C–H Amidation of <i>N</i>-Sulfonyl Ketimines: Access To Benzosultam-Fused Quinazolines/Quinazolinones
作者:Aniket Mishra、Upasana Mukherjee、Tripta Kumari Vats、Indubhusan Deb
DOI:10.1021/acs.joc.8b00125
日期:2018.4.6
unprecedented mild C–H amidation for weakly coordinating cyclic N-sulfonyl ketimines, accelerated by a mono protected l-amino acid, has been developed. The method uses 1,4,2-dioxazol-5-ones as the robust amidating reagent in conjunction with a catalytic amount of silver triflate. It is highlyselective and does not require a stoichiometric amount of oxidants or additives. A series of mechanistic experiments
已经开发了Ir(III)催化的空前温和的C H H酰胺化,用于弱配位的环状N-磺酰基酮亚胺,由一个单保护的1-氨基酸促进。该方法与催化量的三氟甲磺酸银一起使用1,4,2-二恶唑-5-酮作为强力酰胺化试剂。它具有很高的选择性,不需要化学计量的氧化剂或添加剂。进行了一系列的机械实验,以获取对反应机理的一些见解。该策略可轻松获得具有药学相关功能的新型苯并舒坦-喹唑啉和苯并舒坦-喹唑啉酮杂合支架。
Synthesis of 2,5-Disubstituted Oxazoles and Oxazolines Catalyzed by Ruthenium(II) Porphyrin and Simple Copper Salts
作者:Chuan Long Zhong、Bo Yang Tang、Ping Yin、Yue Chen、Ling He
DOI:10.1021/jo202663n
日期:2012.5.4
A novel and moderate synthesis of 2,5-disubstituted oxazoles and oxazolines involving ruthenium(II) porphyrin copper chloride catalyzed cyclization was developed. These reactions using readily available benzene carboxylic acids and phenylethenes or phenylacetylenes are performed under mild conditions. The reactions proceed in series, giving rise to the formation of an intermolecular C-N bond and an intramolecular C-O bond, which yield oxazole or oxazoline derivatives simultaneously.