Qi Dai , Penghua Li , Yaran Cao , Xiangying Xie , Chen Zhang , Mingyue Zheng , Haiwei Shen
{"title":"2-(1-Phenylvinyl)benzoic acid as a highly active leaving group for metal-free glycosylation†","authors":"Qi Dai , Penghua Li , Yaran Cao , Xiangying Xie , Chen Zhang , Mingyue Zheng , Haiwei Shen","doi":"10.1039/d4qo02186j","DOIUrl":"10.1039/d4qo02186j","url":null,"abstract":"<div><div>In the field of modern biochemistry and drug development, the acquisition of homogeneous sugar complexes is crucial for evaluating their biophysical activities. These sugar complexes are essential for understanding biomacromolecule functions and serve as potential vaccine candidates. The synthesis of sugar conjugates is a key step in achieving this goal, and the selection of sugar donors and control of glycosylation reaction outcomes are particularly important in this process. Our recent research indicates that glycosyl PVB donors exhibit self-stability, high reactivity, and excellent yields when activated by NIS/TMSOTf promoters. Notably, glycosyl PVB donors can achieve similar glycosylation effects with I<sub>2</sub> activation. These metal-free reaction conditions are broadly applicable to the synthesis of various <em>O</em>-glycosides, <em>N</em>-glycosides, and the carbohydrate drug PG545 (an anti-tumor agent).</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1572-1578"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yixuan Zheng , Xinhao Deng , Fei Zhao , Yuanyuan Peng , Qiongjiao Yan , Wei Wang , Fener Chen , Hui Zhou
{"title":"Pd-catalyzed asymmetric allylic alkylation of N-hydroxyphthalimide esters with allyl acetates†","authors":"Yixuan Zheng , Xinhao Deng , Fei Zhao , Yuanyuan Peng , Qiongjiao Yan , Wei Wang , Fener Chen , Hui Zhou","doi":"10.1039/d4qo02257b","DOIUrl":"10.1039/d4qo02257b","url":null,"abstract":"<div><div>The palladium-catalyzed asymmetric allylic alkylation of carbon-based pronucleophiles is a highly efficient strategy for the synthesis of pharmaceutically relevant molecules. While significant progress has been made in the allylation of azlactones to access valuable α-amino acids, there remains a notable gap in catalytic asymmetric transformations regarding 2-alkyl-4-aryl-, 2,4-diaryl-, and 2,4-dialkyl-substituted azlactones. To address this challenge, we developed a palladium-catalyzed asymmetric allyl substitution of <em>N</em>-acyl phenylglycine <em>N</em>-hydroxyphthalimide esters with allyl acetates, featuring good yields, remarkable stereoselectivity, and a broad substrate scope. Furthermore, the allylated products can be readily derivatized into diverse polyfunctional compounds that have great potential for the exploitation of pharmaceuticals and biologically active molecules.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1537-1542"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142935438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Synthesis and antibacterial evaluation of prenylacridone alkaloids and their analogues†","authors":"Shilpi Karmakar , Kousik Maji , Sudeshna Mondal , Semantee Bhattacharya , Jyotirmayee Dash","doi":"10.1039/d4qo02126f","DOIUrl":"10.1039/d4qo02126f","url":null,"abstract":"<div><div>A concise total synthesis of natural prenylacridone alkaloids, <em>N</em>-methylcycloatalaphylline A, <em>N</em>-methylbuxifoliadine D, buxifoliadine D, oriciacridone E, glycocitrine II, norglycocitrine II, 3-<em>O</em>-methoxyglycocitrine II and a new series of their non-natural analogues with diverse functionalities is achieved. Antibacterial assays of these alkaloids revealed that the difluoro glycocitrine II derivative exhibits the highest potency against <em>Streptococcus</em> species.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1485-1490"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hui Chen , Xuan Shang , Nan Jiang , Quan Zhou , Ke-Wen Tang , Long-Jin Zhong , Yu Liu
{"title":"Photoinduced copper-catalyzed three-component alkylarylation of alkenes involving C–S bond cleavage of sulfonium salts†","authors":"Hui Chen , Xuan Shang , Nan Jiang , Quan Zhou , Ke-Wen Tang , Long-Jin Zhong , Yu Liu","doi":"10.1039/d4qo01740d","DOIUrl":"10.1039/d4qo01740d","url":null,"abstract":"<div><div>We report a novel visible-light-induced copper-catalyzed intermolecular 1,2-alkylarylation of alkenes with cyclic sulfonium salts and nucleophiles <em>via</em> selective C–S bond cleavage for the construction of thioether-containing 1,1-diarylalkanes. In this transformation, the remote aryl-thioether-containing aliphatic alkyl chains and nucleophiles are successively installed into the CC bond of alkenes through a radical relay coupling process in a single operation. Furthermore, the mild reaction conditions allow for good compatibility in the scope of styrenes, sulfonium salts and nucleophiles, as well as bioactive molecules and derivatives.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1498-1505"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jun Jin , Yan-Ling Li , Li-Hua Chen , Feng Zhang , Xin-Yu Zuo , Yan-Rong Zeng , Jue Yang , Xiao-Jiang Hao , Chun-Mao Yuan
{"title":"Six pairs of α-pyrone meroterpenoid dimers from Hypericum monogynum with anti-neuroinflammatory activity†","authors":"Jun Jin , Yan-Ling Li , Li-Hua Chen , Feng Zhang , Xin-Yu Zuo , Yan-Rong Zeng , Jue Yang , Xiao-Jiang Hao , Chun-Mao Yuan","doi":"10.1039/d4qo02179g","DOIUrl":"10.1039/d4qo02179g","url":null,"abstract":"<div><div>Hypericumonates A–F (), six pairs of new α-pyrone meroterpenoid dimers, along with four possible precursors () were isolated from the leaves and twigs of <em>Hypericum monogynum</em>. Hypericumonates A–C, the first α-pyrone meroterpenoid dimers with two motifs (a 6/6/4-6/6 ring system) connected <em>via</em> C-8–C-9, were proposed <em>via</em> [2 + 2] cycloaddition of α-pyrone meroterpenoid. Their structures were determined by spectroscopic analysis, quantum chemical calculations, and single-crystal X-ray diffraction analysis. From biosynthesis analysis, five pairs of new α-pyrone meroterpenoid dimers () are derived from a new isopentenyl-α-pyrone (). Compounds is an unusual homodimer, whereas compounds and represent rare heterodimers. Inspired by the traditional anti-inflammatory usages of <em>H. monogynum</em>, all dimers except for were discovered to show good NO inhibitory effect with IC<sub>50</sub> values of 2.41 ± 0.31 μM to 14.25 ± 1.93 μM, better than the positive control, minocycline (IC<sub>50</sub>: 19.09 ± 1.34 μM). Further mechanistic study implied that (+)- could prohibit the expression of iNOS and COX-2 in BV-2 cells, and the molecular docking study implied the possible interaction between (+)-/(−)- and these two proteins.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1593-1602"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142968531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuwei Li , Linqi Wang , Shangyuan Wang , Jun Ying
{"title":"Palladium-catalyzed decarboxylative domino synthesis of fused quinolin-2(1H)-one scaffolds containing a perfluoroalkyl unit†","authors":"Shuwei Li , Linqi Wang , Shangyuan Wang , Jun Ying","doi":"10.1039/d4qo01970a","DOIUrl":"10.1039/d4qo01970a","url":null,"abstract":"<div><div>A novel palladium-catalyzed domino radical cyclization and C–H activation/decarboxylation of 1,7-enynes with <em>o</em>-bromobenzoic acids and perfluoroalkyl iodides has been developed for the expedited construction of fused perfluoroalkyl-containing quinolin-2(1<em>H</em>)-one scaffolds. This method provides a facile synthesis of fused quinolin-2(1<em>H</em>)-one derivatives containing a perfluoroalkyl unit in high yields. Notably, the late-stage modifications of various drugs were also demonstrated by using this method.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1506-1512"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Muhammad Imran , Lin Yang , Jin-Jiang Zhang , Zhen-Lin Qiu , Yubin Fu , Noel Israel , Evgenia Dmitrieva , Andrea Lucotti , Gianluca Serra , Matteo Tommasini , Ji Ma , Xinliang Feng
{"title":"A persistent concealed non-Kekulé nanographene: synthesis and in situ characterization†","authors":"Muhammad Imran , Lin Yang , Jin-Jiang Zhang , Zhen-Lin Qiu , Yubin Fu , Noel Israel , Evgenia Dmitrieva , Andrea Lucotti , Gianluca Serra , Matteo Tommasini , Ji Ma , Xinliang Feng","doi":"10.1039/d4qo02019g","DOIUrl":"10.1039/d4qo02019g","url":null,"abstract":"<div><div>Concealed non-Kekulé (CNK) nanographenes have recently gained attention as promising non-Kekulé model systems due to their distinctive antiferromagnetic electronic spins, which offer potential applications in spintronics and quantum information science. However, synthesizing CNK nanographenes in solution remains a significant challenge because of their strong biradical character and high reactivity. In this study, we report the successful synthesis of a novel CNK nanographene with two phenalene units fused in a <em>cis</em> configuration to perylene (), which exhibits persistent stability under ambient conditions, with a half-life (<em>t</em><sub>1/2</sub>) of 59 minutes. The formation of is confirmed using <em>in situ</em> UV-Vis-NIR spectroscopy, Raman spectroscopy, and high-resolution mass spectrometry. The open-shell character of is supported by electron paramagnetic resonance (EPR) spectroscopy by observing an isotropic signal with a <em>g</em>-value of 2.0026. Quantum chemical simulations reveal a high biradical character (<em>y</em><sub>0</sub> = 0.97) and a singlet open-shell ground state with a small singlet–triplet energy gap (Δ<em>E</em><sub>S–T</sub>) of 0.4 kcal mol<sup>−1</sup>. This work presents a solution synthesis of a next-generation concealed non-Kekulé nanographene with intrinsic antiferromagnetic electronic spins, highlighting its potential as a promising material for future quantum technologies.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1432-1437"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/qo/d4qo02019g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhendong Cheng , Weiwei Xu , Xuliang Tan , Zhengrui Zhou , Liwei Zhou , Yun Liang , Yuan Yang
{"title":"C–H silylation and boronation enabled by alkyne insertion/vinyl to aryl 1,5-palladium migration†","authors":"Zhendong Cheng , Weiwei Xu , Xuliang Tan , Zhengrui Zhou , Liwei Zhou , Yun Liang , Yuan Yang","doi":"10.1039/d4qo02224f","DOIUrl":"10.1039/d4qo02224f","url":null,"abstract":"<div><div>1,<em>n</em>-Metal migration represents a powerful strategy for C–H functionalization that is otherwise difficult to achieve. Nevertheless, catalytic reactions involving 1,5-palladium migration have rarely been reported so far. Herein, an alkyne insertion/vinyl to aryl 1,5-palladium migration strategy has been disclosed for the α-C–H silylation and boronation of a naphthalene ring, thus achieving the transformation of alkyne-tethered naphthalene bromides to silylated and boronated benzo[<em>f</em>]isoquinolines and benzo[<em>f</em>]isochromenes in moderate to excellent yields.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1491-1497"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ye Lim Kim , Yuri Yun , Seoung-Mi Choi , Ju Hyun Kim
{"title":"Solvent-controlled catalytic divergent C–H alkylation of quinolones driven by unusual DMSO-promoted 1,3-heteroarene migration†","authors":"Ye Lim Kim , Yuri Yun , Seoung-Mi Choi , Ju Hyun Kim","doi":"10.1039/d4qo01980f","DOIUrl":"10.1039/d4qo01980f","url":null,"abstract":"<div><div>We report on a catalytic divergent C–H alkylation of 4-quinolones with diazo compounds where the reaction pathways are controlled by a reaction solvent. Cp*Rh(<span>iii</span>)-catalyzed site-selective C–H alkylation was carried out in dichloromethane to produce C2-alkylated 4-quinolones. C(2)–H alkylation and sequential [1,3]-heteroarene rearrangement were achieved by utilizing EtOH/DMSO solvent in the same catalytic system at 70 °C, allowing valuable 4-quinolones bearing an all-carbon quaternary center at the 2-position to be efficiently synthesized in a one-pot operation. By combining experimental results and computational studies, we propose an unprecedented DMSO-promoted Truce–Smiles rearrangement.</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1452-1460"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142887223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ning Xian , Xiaochen Ji , Guo-Jun Deng , Huawen Huang
{"title":"Visible-light-induced photoredox aerobic coupling of sulfonium ylides and amines leading to the E-selective formation of 2-amino-2-butene-1,4-diones†","authors":"Ning Xian , Xiaochen Ji , Guo-Jun Deng , Huawen Huang","doi":"10.1039/d4qo02208d","DOIUrl":"10.1039/d4qo02208d","url":null,"abstract":"<div><div>A novel visible-light-induced photoredox three-component aerobic coupling reaction of sulfoxonium ylides and amines is reported. This protocol provides a general strategy for the construction of structurally valuable highly functionalized 2-amino-2-butene-1,4-dione scaffolds in a chemo- and regioselective manner. This methodology stands out for its mild conditions, no requirement of organic oxidants or other additives, and good <em>E</em>-selectivity. Mechanistic studies suggested that dioxygen serves as a dual functional reagent not only in the photoredox cycle (light reaction) but also in the aerobic oxidative coupling (dark reaction).</div></div>","PeriodicalId":94379,"journal":{"name":"Organic chemistry frontiers : an international journal of organic chemistry","volume":"12 5","pages":"Pages 1586-1592"},"PeriodicalIF":0.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142917793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}