Rhodium(III)-Catalyzed<i>ortho</i>Alkenylation of<i>N</i>-Phenoxyacetamides with<i>N</i>-Tosylhydrazones or Diazoesters through CH Activation
作者:Fangdong Hu、Ying Xia、Fei Ye、Zhenxing Liu、Chen Ma、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201309650
日期:2014.1.27
A coupling reaction of N‐phenoxyacetamides with N‐tosylhydrazones or diazoestersthrough RhIII‐catalyzed CHactivation is reported. In this reaction, ortho‐alkenyl phenols were obtained in good yields and with excellent regio‐ and stereoselectivity. Rh–carbene migratory insertion is proposed as the key step in the reaction mechanism.
作者:Zhenhua Zhang、Yiyang Liu、Mingxing Gong、Xiaokun Zhao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.200906349
日期:2010.2.1
On the move: A palladium‐catalyzed reaction of aryl iodides, diazo compounds or N‐tosylhydrazones, and carbon monoxide affords β‐oxo esters or ketones/enones (see scheme; DCE=1,2‐dichloroethane). The products are delivered with high efficiency through the title sequence.
Efficient palladium-catalyzed cross-coupling reactions of α-diazocarbonyl compounds and arylboronic acids or arylhalides have been developed. The reaction proceeds smoothly for a range of diazo compounds, boronic acids, and halides. The coupling reaction conditions tolerate various substituents on the aromatic rings of the substrates, such as chloro, fluoro, acyl, oxo, ester, and nitro groups. This
Palladium-Catalyzed Oxidative Cross-Coupling of N-Tosylhydrazones or Diazoesters with Terminal Alkynes: A Route to Conjugated Enynes
作者:Lei Zhou、Fei Ye、Jiachen Ma、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201007224
日期:2011.4.4
Coming at them from another angle: In a fresh approach to the synthesis of conjugatedalkynes, the palladium‐catalyzed cross‐coupling of N‐tosylhydrazones or diazoesters with terminalalkynes provided the desired enyne products with excellent stereoselectivity (see scheme; Ts=p‐toluenesulfonyl). The reaction is proposed to involve an unprecedented alkynyl migratory insertion of a palladium carbene
从另一个角度出发:在一种新颖的共轭炔烃合成方法中,钯催化的N-甲苯磺酰hydr或重氮酸酯与末端炔烃的交叉偶联为所需的烯炔产物提供了出色的立体选择性(参见方案; Ts = p ‐甲苯磺酰基)。提出该反应涉及钯卡宾络合物的前所未有的炔基迁移插入。
Rhodium-Catalyzed Regioselective <i>N</i>
<sup>2</sup>
-Alkylation of Benzotriazoles with Diazo Compounds/Enynones via a Nonclassical Pathway
作者:Kai Wang、Ping Chen、Danqing Ji、Xinhao Zhang、Guangyang Xu、Jiangtao Sun
DOI:10.1002/anie.201807039
日期:2018.9.17
rhodium‐catalyzed highly selective N2‐alkylation of benzotriazoles with diazo compounds/enynones is achieved, providing N2‐alkylated benzotriazoles in good to excellent yields and with excellent N2 selectivities. Importantly, different to traditional carbeneinsertion into X−H (X=N, O etc) bonds, DFT calculations disclose that this selective N2‐alkylation probably proceeds through a formal 1,3‐ rather than