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Aryl-to-alkyl radical relay arylation reaction of remote C(sp3)-H bond using 1,4-dicyanobenzene as an electrochemical redox-mediator 以 1,4-二氰基苯为电化学氧化还原介质实现远端 C(sp3)-H 键的芳基-烷基自由基中继芳基化反应
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-07 DOI: 10.1039/d4qo00623b
Weijie Yu, Hongjie Zhang, Zhipeng Shen, Lingyun Yang, Jin Luo, Wendong Li, Kuang Zhao, Xiaolong Li, Jiale Xu, Yuan Zhou, Tao Wang
An electroreduction-enabled aryl-to-alkyl radical relay arylation reaction of remote C(sp3)-H bond of 2-iodoalkylarenes is reported. This electrochemical strategy undergoes a 1,5-H transfer process, leading to various arylated products bearing all-carbon quaternary centers under transition-metal and ligand-free conditions. The aryl nitriles serve as both aryl radical precursors and redox mediators in this transformation.
本研究报道了一种电还原催化的 2-iodoalkylarenes 远端 C(sp3)-H 键的芳基-烷基自由基接替芳基化反应。这种电化学策略经历了一个 1,5-H 转移过程,在过渡金属和无配体条件下产生了各种带有全碳季中心的芳基化产物。在这一转化过程中,芳基腈既是芳基自由基前体,又是氧化还原媒介。
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引用次数: 0
Catalytic alkane C–H functionalization by carbene insertion into unactivated C(sp3)–H bonds 通过碳烯插入未活化的 C(sp3)-H 键催化烷烃 C-H 功能化
IF 4.6 1区 化学 Q1 Chemistry Pub Date : 2024-06-07 DOI: 10.1039/D4QO00606B
Yongzhen Pan, Yeming Wang, Swastik Karmakar, Paramasivam Sivaguru and Zhaohong Liu

The direct and selective C–H functionalization of unactivated alkanes has been an outstanding yet challenging goal of modern synthetic chemistry. The C(sp3)–H insertion of metal carbenes has established itself as one of the most powerful methodologies for achieving alkane C–H functionalization, allowing for exquisite regioselectivity and stereoselectivity without resorting to the usage of directing groups. This review highlights the early and recent developments in the C–H functionalization of simple alkanes by carbene insertion into unactivated C(sp3)–H bonds. This review is organized into four sections: metal-catalyzed insertion of acceptor, acceptor/acceptor, donor/acceptor and donor carbenes into the C–H bonds of cycloalkanes and linear alkanes, respectively.

对未活化的烷烃进行直接和选择性的 C-H 功能化一直是现代合成化学的一个杰出而又具有挑战性的目标。金属碳烯诱导的 C(sp3)-H 插入已成为实现烷烃 C-H 功能化最有力的方法之一,无需使用定向基团即可实现精湛的区域选择性和立体选择性。本综述重点介绍了通过金属-碳烯诱导 C-H 插入实现简单烷烃 C-H 功能化的早期和最新进展。综述分为四个部分:金属催化的受体、受体/受体、供体/受体和供体碳烯分别插入环烷烃和线性烷烃的 C-H 键。
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引用次数: 0
Silanes a Versatile Hydride Source for Ni–H Chemistry: A Promising Tool for π-Hydro Functionalization 硅烷是镍氢化学的多功能氢化物源:π-氢功能化的理想工具
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-07 DOI: 10.1039/d4qo00860j
Yafia Kousin Mirza, Partha Sarathi Bera, Sachin Mohite, Ajeet Kumar Pandey, Milan Bera
Silanes, a simple and common hydride source, are emphasized for their chemical stability, neat and easy-to-handle and usually not requiring any precautions upon activation by nickel catalysis. Their hydride donor nature, reacted with ligand tailored nickel complex generates reactive Ni-H species, which is normally more prone to facile addition to the π-bond, thus generating the organonickel intermediate, which can undergo variety of sequential cross-coupling reactions. Notably, recent developments have brought to the forefront π-hydrofunctionalization reactions facilitated by Ni-H catalysis. In addition, the exploitation of suitable chiral ligands has paved the way for the realization of asymmetric hydrofunctionalization reactions in the realm of π-bonds. This review aims to provide an in-depth exploration of the latest achievements in C-C and C-heteroatom bond formations through silane mediated hydrofunctionalization catalyzed by nickel hydride. In particular, the NiH/ligand-catalytic system exhibits remarkable reactivity with π-substrates including alkenes, alkynes, and allenes. A thorough mechanistic understanding of these processes offers insights into the trends and future direction in drive innovation in catalyst design, fine tune reaction systems, and development of new cross-coupling reactions with π-substrates.
硅烷是一种简单而常见的氢化物来源,因其化学性质稳定、纯净、易于处理以及在镍催化活化时通常无需采取任何预防措施而受到重视。它们具有氢化物供体性质,与配体定制的镍络合物反应后会产生活性 Ni-H 物种,通常更容易与 π 键发生加成反应,从而生成有机镍中间体,该中间体可发生各种连续的交叉偶联反应。值得注意的是,最近的发展已将 Ni-H 催化下的π-氢功能化反应推到了前沿。此外,利用合适的手性配体为实现π键领域的不对称氢官能化反应铺平了道路。本综述旨在深入探讨在氢化镍催化下,通过硅烷介导的氢官能化反应形成 C-C 和 C-heteroatom 键的最新成果。特别是,氢化镍/配体催化体系在与π基质(包括烯、炔和烯烃)发生反应时表现出显著的活性。对这些过程的透彻机理理解,有助于深入了解推动催化剂设计创新、微调反应体系以及开发以 π 为底物的新型交叉偶联反应的趋势和未来方向。
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引用次数: 0
Photoredox-Catalyzed Hydrogenation of Alkenes Assisted by in situ Generated PPh3(OH) Radical and Acetic Acid 原位生成的 PPh3(OH)自由基和乙酸辅助的光氧化催化烯烃氢化反应
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-07 DOI: 10.1039/d4qo00661e
Zhen-Zhen Xie, Yu Zheng, Zi-Hao Liao, Chu-Ping Yuan, Ming-Zhi Li, Ke-yi Deng, Haoyue Xiang, Kai Chen, Hua Yang
Herein, a practical, mild and convenient strategy was disclosed for the hydrogenation of alkenes under photocatalytic conditions through HAT/protonation process. A combination of experimental and computational studies suggested water was activated by a phosphine radical cation to generate the critical intermediate PR3(OH) radical, which acted as a “free” hydrogen atom to faciliate the initial HAT process.
本文揭示了一种在光催化条件下通过 HAT/质子化过程进行烯烃氢化的实用、温和、便捷的策略。实验和计算研究表明,水被膦自由基阳离子激活,生成临界中间体 PR3(OH)自由基,该自由基作为 "自由 "氢原子促进了最初的 HAT 过程。
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引用次数: 0
An efficient platform for decarboxylative functionalization of carboxylic acids using sulfuryl fluoride: Pd-catalyzed decarboxylative dehydrogenation of alkanecarboxylic acids and decarboxylative cross-coupling of arenecarboxylic acids 使用硫酰氟对羧酸进行脱羧官能化的高效平台:钯催化烷基羧酸的脱羧脱氢反应和非烷基羧酸的脱羧交叉偶联反应
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-06 DOI: 10.1039/d4qo00428k
Chenfei Guan, huijie Qi, Linjun Han, Guofu Zhang, Jinghui Lyu, Chengrong Ding
Decarboxylation functionalization of carboxylic acids has evolved to valuable synthetic methods because of the structural diversity of carboxylic acids and their utility in drug discovery as directing groups for C–H activation. Although transition-metal-catalyzed decarboxylation is one of the most common methods, it typically requires complex operations and additives within a limited substrate scope. In this study, we show that the use of a palladium-catalyzed system together with sulfuryl fluoride can readily effect decarboxylative dehydrogenation and decarboxylative cross-coupling of various alkyl and aryl carboxylic acids. Based on mechanistic studies including DFT calculations, a detailed catalytic cycle is presented in which rapid generation of an acyl fluoride from the reaction of SO2F2 with a carboxylic acid is critical for initiating catalysis. The versatility of a new mediator platform has been demonstrated with a diverse range of substrates and applications.
羧酸的脱羧功能化已发展成为一种重要的合成方法,这是因为羧酸的结构具有多样性,而且在药物发现中可作为 C-H 活化的导向基团。虽然过渡金属催化脱羧是最常见的方法之一,但它通常需要在有限的底物范围内进行复杂的操作和添加剂。在本研究中,我们发现使用钯催化系统和硫酰氟可以轻松实现各种烷基和芳基羧酸的脱羧脱氢和脱羧交叉偶联。基于包括 DFT 计算在内的机理研究,提出了一个详细的催化循环,其中 SO2F2 与羧酸反应快速生成酰基氟化物是启动催化反应的关键。新介质平台的多功能性已在多种底物和应用中得到证实。
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引用次数: 0
Pyridine-Boryl Radical Mediated Cascade Reaction towards the Synthesis of Indolizines: A Computational Mechanistic Analysis 吡啶-芳基自由基介导的级联反应合成吲哚利嗪类化合物:计算机理分析
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-06 DOI: 10.1039/d4qo00558a
Zhang Xinyu, Xiangxue Cao, Lanfeng Wei, Zhijun Wang, Yu Wei, Liang Xu, Genping Huang
The pyridine-boryl radical chemistry has witnessed significant advancements in the last decade, enabling an array of novel synthetic applications. In this context, density functional theory calculations provide a computational mechanistic analysis of the pyridine/B2pin2-mediated cascade synthesis of indolizines. The radical-radical cross-coupling pathway is dissected to be energetically more feasible than the conventionally assumed Minisci-type radical addition route. Furthermore, the computations reveal that a 1,4-O[B] migration step leads to the formation of zwitterionic intermediates, whose cyclization then generates the indolizine scaffolds. H-shuttles, generated from water, alcohol, or amine molecules, are found to play pivotal roles in facilitating the elimination or aromatization processes.
在过去十年中,吡啶-硼自由基化学取得了重大进展,促成了一系列新型合成应用。在此背景下,密度泛函理论计算对吡啶/B2pin2-介导的吲嗪类化合物级联合成进行了计算机理分析。与传统的米尼斯基型自由基加成路线相比,自由基-自由基交叉偶联路线在能量上更为可行。此外,计算显示,1,4-O[B] 迁移步骤会导致形成齐聚物中间体,其环化反应会生成吲嗪类支架。研究发现,由水、醇或胺分子生成的 H 键在促进消除或芳香化过程中发挥了关键作用。
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引用次数: 0
Selective C2 and C3 Phosphorylmethylation of Indoles with a Phosphorylmethyl Dibenzothiophenium Reagent 用磷酰甲基二苯并噻吩试剂对吲哚进行选择性 C2 和 C3 磷酰甲基化反应
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-05 DOI: 10.1039/d4qo00611a
Xiaomin Shi, Hongmei Qu, Yaxing Wu, Fei Wang, Chao Chen
A novel electrophilic phosphorylmethylating reagent, S-([diethoxyphosphoryl]methyl) dibenzothiophenium salt, has been successfully synthesized with readily available starting materials. This reagent is air- and moisture-tolerant and bench-stable. Interestingly, the reagent exhibited excellent selectivity for the formation of indole C (sp2) - CH2PO(OEt)2 bonds at position C2 with photo-catalyst and position C3 with Cu-catalyst. Moreover, the resulting compounds with CH2PO(OEt)2 could be easily converted into free phosphinic acid, providing a new pathway to prepare complex acid molecules.
一种新型亲电磷酰甲基化试剂--S-([二乙氧基磷酰]甲基)二苯并噻吩盐--已利用现成的起始材料成功合成。这种试剂耐气、耐湿,在工作台中也很稳定。有趣的是,该试剂在光催化剂的 C2 位和铜催化剂的 C3 位上形成吲哚 C (sp2) - CH2PO(OEt)2 键时表现出极佳的选择性。此外,生成的含有 CH2PO(OEt)2 的化合物可以很容易地转化为游离膦酸,为制备复杂的酸分子提供了新的途径。
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引用次数: 0
Synthesis of Polysubstituted Fused Pyrrolidines via [2+2]/[2+3] Cycloaddition of Azomethine Ylides 通过偶氮甲基酰化物的 [2+2]/[2+3] 环加成法合成多取代的融合吡咯烷
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-05 DOI: 10.1039/d4qo00483c
Chunyan Ou, Jian Wang, Pingping Yin, Bin Chen, Ping Hu, Bi-Qin Wang, Peng Cao, Minghui Xu
A general approach to densely substituted via [2+2]/[2+3]-cycloaddition between nonstabilized azomethine ylide, alkyne and silyl enol ether was elaborated. This approach not only allowed preparation of novel molecules but also significantly simplified synthesis of the existing ones. 3-Azabicyclo[3.2.0]heptanes which contained polysubstituted cyclobutanes could be obtained in medium to good yield with excellent diastereoselectivity.
我们详细阐述了通过非稳定偶氮甲烷、炔烃和硅烷基烯醇醚之间的 [2+2]/[2+3]- 碳加成反应进行密集取代的一般方法。这种方法不仅可以制备新型分子,还大大简化了现有分子的合成。含有多取代环丁烷的 3-氮杂双环[3.2.0]庚烷能以中等至良好的收率和出色的非对映选择性获得。
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引用次数: 0
Three-component Formal Metathesis via Remote Activating Strategy Enabled (RASE) Domino Activation of Two C(sp3)-O Bonds in Alkyl Ethers 通过远程活化策略(RASE)多米诺活化烷基醚中的两个 C(sp3)-O 键的三组分官能团复分解反应
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-04 DOI: 10.1039/d4qo00740a
Dailin Zhuang, Le Cheng, Yichuan Yan, Yuting Tang, Zhenyang Wan, Jiahao Gu, Yuhong Lu, Xinyao Li, Ziyuan Li
A remote activating strategy enabled (RASE) three-component formal metathesis among an alkyl benzyl ether, an alkyl aryl ether and a Bronsted acid is achieved through metal-free domino activation of two C(sp3)-O bonds in alkyl ethers under mild conditions, leading to dealkoxylative C(sp3)-N coupling products in good to excellent yields. Upon in situ generation of the benzyl alkyl ether employed in this smooth metathesis, this chemistry offers an efficient strategy for direct site-selective introduction of pharmaceutically significant monocyclic thiazol-2(3H)-one scaffolds onto specific benzylic sites. A probable mechanism is also provided based on the results of control experiments and DFT calculations.
在温和的条件下,通过对烷基醚中的两个 C(sp3)-O 键进行无金属多米诺活化,实现了烷基苄基醚、烷基芳基醚和勃朗斯特德酸之间的远程活化策略(RASE)三组份形式复分解反应,从而以良好到极佳的收率获得脱烷氧 C(sp3)-N 偶联产物。在这种平滑复分解反应中原位生成苄基烷基醚后,这种化学反应提供了一种有效的策略,可将具有药理意义的单环噻唑-2(3H)-酮支架直接定点选择性地引入特定的苄基位点。根据对照实验和 DFT 计算的结果,还提供了一种可能的机理。
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引用次数: 0
Palladium-catalyzed decarboxylative (5 + 5) cyclization reaction of vinyloxazolidine-2,4-diones: access to ten-membered N,O-containing heterocycles 钯催化乙烯基恶唑烷-2,4-二酮的脱羧(5 + 5)环化反应:获得十元含 N、O 的杂环
IF 5.4 1区 化学 Q1 Chemistry Pub Date : 2024-06-04 DOI: 10.1039/d4qo00609g
Xiao-Hui Fu, Juan Liao, Zhen-Hua Wang, Zhen-Zhen Ge, Ming-Qiang Zhou, Yong You, Yan-Ping Zhang, Jian-Qiang Zhao, Ji-Hong Lu, Wei-Cheng Yuan
This study describes a palladium-catalyzed decarboxylative (5 + 5) cyclization reaction of vinyloxazolidine-2,4-diones. The cyclization reaction between aza-π-allylpalladium and oxa-π-allylpalladium intermediates, both in situ generated from vinyloxazolidine-2,4-diones, is successfully realized to produce a series of ten-membered N,O-containing heterocycles in up to 90% yield. This work represents a pioneering application of vinyloxazolidine-2,4-diones as oxa-π-allylpalladium species precursor for the construction of heterocyclic compounds.
本研究描述了一种钯催化的乙烯基恶唑烷-2,4-二酮的脱羧(5 + 5)环化反应。由乙烯基恶唑烷-2,4-二酮原位生成的za-π-烯丙基钯和oxa-π-烯丙基钯中间体成功地实现了环化反应,生成了一系列含 N、O 的十元杂环,收率高达 90%。这项工作开创性地将乙烯基恶唑烷-2,4-二酮作为氧杂π-烯丙基钯前体用于杂环化合物的构建。
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引用次数: 0
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Organic Chemistry Frontiers
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