Regioselective and Redox‐Neutral Cp*Ir
<sup>III</sup>
‐Catalyzed Allylic C−H Alkynylation
作者:Shobhan Mondal、Tobias Pinkert、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.202015249
日期:2021.3.8
bromoalkynes via intermolecular allylicC−Halkynylation. The developed mild reaction conditions tolerate a broad range of common functional groups, even enabling selective alkynylation of allylicC−H bonds in the presence of other prominent directing groups. Mechanistic experiments including the isolation of a catalytically active IrIII‐allyl species support an intermolecular allylicC−H activation followed by
在本文中,我们报道了Cp * Ir III催化的高度区域选择性和氧化还原中性方案,用于通过分子间烯丙基CH-H烷基化反应从未活化的烯烃和溴炔烃构建1,4-烯炔。发达的温和反应条件可以耐受广泛的通用官能团,甚至可以在存在其他重要的导向基团的情况下选择性烯丙基CH键进行炔基化反应。包括分离具有催化活性的Ir III-烯丙基物种的机械实验支持分子间烯丙基CH活化,然后进行亲电炔基化。
Palladium-Catalyzed Tandem Dehydrogenative [4 + 2] Annulation of Terminal Olefins with <i>N</i>-Sulfonyl Amides via C–H Activations
作者:Manman Sun、Weida Chen、Xiangyu Xia、Guodong Shen、Yongmin Ma、Jianguo Yang、Hanfeng Ding、Zhiming Wang
DOI:10.1021/acs.orglett.0c01011
日期:2020.4.17
palladium-catalyzed tandem dehydrogenative [4 + 2] annulation of terminalolefins with N-sulfonyl amides via C(sp2)–H activation, allylicC(sp3)–H activation, and homoallylic C(sp3)–H elimination processes has been developed. Promoted by the DMSO ligand, various benzamides, heterocyclic arylamides, alkenyl carboxamides, and commercial olefins are found to be efficient substrates to construct important heterocyclic
Excited‐State Copper Catalysis for the Synthesis of Heterocycles
作者:Arghya Banerjee、Satavisha Sarkar、Jagrut A. Shah、Nicoline C. Frederiks、Emmanuel A. Bazan‐Bergamino、Christopher J. Johnson、Ming‐Yu Ngai
DOI:10.1002/anie.202113841
日期:2022.1.21
Visible-light-induced excited-state copper catalysis enables the synthesis of more than 10 distinct classes of heterocycles. The reaction tolerates a broad array of functional groups and complex molecular scaffolds, including derivatives of peptides, natural products, and marketed drugs.
Indole and Pyrrole Derivatives as Pre-photocatalysts and Substrates in the Sulfonyl Radical-Triggered Relay Cyclization Leading to Sulfonylated Heterocycles
A visible-light-induced method for the construction of heterocyclic scaffolds such as pyrido[1,2-a]indoles and indolizines via sulfonyl radical-triggered relay cyclization without employing any external photocatalyst has been developed. Preliminary mechanistic investigation indicated that indole and pyrrole derivatives could serve as pre-photocatalysts to promote the sulfonylation/cyclization, thereby
已经开发了一种可见光诱导的方法,用于在不使用任何外部光催化剂的情况下通过磺酰基自由基触发的中继环化构建吡啶并[1,2 - a ]吲哚和中氮茚等杂环支架。初步机理研究表明,吲哚和吡咯衍生物可以作为预光催化剂促进磺酰化/环化,从而为合成有价值的磺酰化杂环提供了一种简便的方法。
Intramolecular photochemical cycloadditions of N-alkenyloxycarbonylindoles and N-alkenoylindoles
作者:David L. Oldroyd、Alan C. Weedon
DOI:10.1039/c39920001491
日期:——
Ultraviolet light irradiation of N-alkenoylindoles affords intramolecular [2 + 2] photocycloadducts with regiochemistry opposite to that obtained in the corresponding intermolecular reaction; in contrast, N-alkenyloxycarbonylindoles appear to be relatively photostable because they are frozen in an unreactive conformation for the duration of the excited state lifetime.