Interweaving Visible‐Light and Iron Catalysis for Nitrene Formation and Transformation with Dioxazolones
作者:Jing‐Jing Tang、Xiaoqiang Yu、Yi Wang、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202016234
日期:2021.7.19
transfer reactions with dioxazolones for intermolecular C(sp3)-N, N=S, and N=P bond formation are described. These reactions occur with exogenous-ligand-free process and feature satisfactory to excellent yields (up to 99 %), an ample substrate scope (109 examples) under mild reaction conditions. In contrast to intramolecular C−H amidations strategies, an intermolecular regioselective C−H amidation via
Rhodium(<scp>iii</scp>)-catalyzed directed amidation of unactivated C(sp<sup>3</sup>)–H bonds to afford 1,2-amino alcohol derivatives
作者:Yi Dong、Jiajing Chen、Heng Xu
DOI:10.1039/c8cc05637d
日期:——
A rhodium-catalyzed directed C(sp3)–H amidation to afford 1,2-amino alcohol oxime derivatives has been developed with good yields and a broad substrate scope. In previous methods for this type of reaction, 1-arylethan-1-ol oxime analogues were challenging substrates owing to strong competition fromC(sp2)–H bondactivation. This Rh-catalyzed C–H activation method overcomes the limitation of competitive
Rh-Catalyzed Annulation of <i>ortho</i>
-C−H Bonds of 2-Arylimidazoles with 1,4,2-Dioxazol-5-ones toward 5-Arylimidazo[1,2-<i>c</i>
]quinazolines
作者:Xiaopeng Wu、Song Sun、Shengbo Xu、Jiang Cheng
DOI:10.1002/adsc.201701331
日期:2018.3.20
A Rh‐catalyzed unique and direct approach for constructing a series of 5‐arylimidazo[1,2‐c]quinazolines in moderate to excellent yields from simple and readily available 2‐arylimidazoles and 3‐phenyl‐1,4,2‐dioxazol‐5‐ones was described. This procedure proceeds with sequential ortho‐C−H bond amidation and cyclization, which represents a facile and straightforward pathway to access such frameworks.
用Rh催化的独特直接方法从简单易得的2芳基咪唑和3苯基-1,4,2-二恶唑-以中等到优异的收率构建一系列5芳基咪唑[1,2- c ]喹唑啉描述了5分。此过程以顺序的邻-C-H键酰胺化和环化进行,这代表了访问此类框架的便捷途径。
Rhodium(<scp>iii</scp>)-catalyzed diamidation of olefins <i>via</i> amidorhodation and further amidation
作者:Jinlei Wang、Guangfan Zheng、Xingwei Li
DOI:10.1039/d0cc00952k
日期:——
Rh(III)-catalyzed synthesis of vicinal diamides has been realized via elaboration of an authenticated Rh–C(sp3) species generated via initial intramolecular amidorhodation of olefins. The second amidation was achieved using both electrophilic and nucleophilic amidating reagents. The reactions proceeded under mild conditions with good yield, broad substrate scope, and excellent functional-group tolerance
Experimental and computational studies on H<sub>2</sub>O-promoted, Rh-catalyzed transient-ligand-free <i>ortho</i>-C(sp<sup>2</sup>)–H amidation of benzaldehydes with dioxazolones
We develop an efficient and convenient ligand-free, rhodium-catalyzed ortho-C(sp2)–H amidation of benzaldehydes with dioxazolones using H2O as the key promoter.