{"title":"Highly Stereoselective Reaction of Bicyclo[1.1.0]butanes and Isatins","authors":"Chengzhuo Wang, Weimeng Ma, Jiaxi Xu","doi":"10.1021/acs.joc.6c01677","DOIUrl":"https://doi.org/10.1021/acs.joc.6c01677","url":null,"abstract":"<p>Bicyclo[1.1.0]butanes (BCBs) have emerged as versatilestrainedbuilding blocks for constructing stereodefined cyclic scaffolds. However,the Lewis-acid-catalyzed reaction of BCBs and ketones remains elusive,hampered by the poor electrophilicity and substantial steric hindranceof the ketonic carbonyl group. The La(OTf)<sub>3</sub>-catalyzed reactionof BCBs and isatins achieved highly stereoselective synthesis of 3-(cyclobuten-3-yl)-3-hydroxyindolin-2-onesin up to 97% yield with excellent diastereoselectivity (dr of >20:1).Control experiments and density functional theory calculations corroboratethe reaction as a Baylis–Hillman-type ring-opening activationstrategy with isatin derivatives as representative cyclic ketones,revealing that the amidic carbonyl moiety of isatins stabilizes thekey carbocation intermediates, which is the primary origin of theobserved high diastereoselectivity. Notably, partial products precipitatespontaneously and can be isolated via simple filtration without tediouscolumn chromatography, facilitating scale-up preparation. This protocolprovides an efficient avenue to functionalized heterocyclic scaffoldsand expands the synthetic utility of BCBs.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13694–13701"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Selective Control of Photocatalytic [2 + 2] Cycloaddition versus Isomerization Using Anthraquinone Photosensitizers.","authors":"Yalin Li, Peng Wu, Zixuan Zhang, Hui Zhu, Leju Li, Daicai Jiang, Xuefen Liu, Shuping Luo","doi":"10.1021/acs.joc.6c01920","DOIUrl":"https://doi.org/10.1021/acs.joc.6c01920","url":null,"abstract":"<p><p>Designed anthraquinone photosensitizers enable selective switching between chalcone [2 + 2] cycloaddition and E/Z isomerization. The α-trifluoromethyl group drives isomerization (5:95), whereas the β-tert-butyl group with polychloro substituents promotes cycloaddition (98% yield), a result supported by DFT-derived triplet energies and binding energies. In addition, a relatively high chalcone concentration favors cycloaddition (98%), whereas a low chalcone concentration favors isomerization (98%).</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":" ","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manubolu Guravaiah, Thondooru Sruthi, R Menaka, Vinod D Jadhav, Bandi Ramakrishna, Siddaiah Vidavalur, Katta Venkateswarlu
{"title":"Unexpected T3P-Mediated Enaminoester Cascade Cyclization to Access 4-Pyridones.","authors":"Manubolu Guravaiah, Thondooru Sruthi, R Menaka, Vinod D Jadhav, Bandi Ramakrishna, Siddaiah Vidavalur, Katta Venkateswarlu","doi":"10.1021/acs.joc.6c01549","DOIUrl":"https://doi.org/10.1021/acs.joc.6c01549","url":null,"abstract":"<p><p>The development of novel one-pot cascade protocols for synthesizing biologically significant nitrogen heterocycles plays a vital role in drug discovery and development. We report here a new and unexpected T3P-mediated one-pot transformation of amines and β-ketoesters into 4-pyridones via an enaminoester cascade cyclization process. This method affords structurally diverse and readily multi-tailorable 4-pyridones with up to 99% yields in 1 h at 70 °C, providing rapid access to a pharmaceutically significant heterocyclic motif. Furthermore, this method shows a low E-factor (5.18), a low process mass intensity (PMI, 6.18), and an excellent GreenScore (86). To the best of our knowledge, this study presents the first highly efficient and straightforward multicomponent synthesis of 4-pyridones using readily available substrates.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":" ","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Resonance-Structure Collapse Enables Aromaticity-Controlled Design of Small Singlet-Fission Chromophore Candidates","authors":"Luis Leyva-Parra, Ricardo Pino-Rios","doi":"10.1021/acs.joc.6c01083","DOIUrl":"10.1021/acs.joc.6c01083","url":null,"abstract":"<p>Precise control of singlet and tripletexcited-stateenergies isessential for identifying singlet-fission chromophore candidates,particularly in compact heteroarenes with competing resonance structures.Here, we show that heteroatom-controlled resonance-structure selectionprovides a chemically transparent strategy for tuning excited-stateenergetics. Comparison of normal-type and iso-type benzannulated five-memberedheteroarenes across the NH, O, S, Se, and Te series reveals that heteroatomconnectivity governs the redistribution of π-electron delocalizationupon excitation. Iso-type connectivity consistently stabilizes <em>T</em><sub>1</sub> and increases <em>E</em>(<em>S</em><sub>1</sub>)/<em>E</em>(<em>T</em><sub>1</sub>),a trend reproduced by vertical TD-DFT, the Zeng–Hoffmann–Ananthscheme, fully adiabatic calculations, and DLPNO-STEOM-CCSD. Calculationson the experimentally established singlet-fission chromophore 1,3-diphenylisobenzofuranfurther support these protocols as comparative screening tools. Aromaticityand spin-density analyses show that <em>T</em><sub>1</sub> stabilization arises from topology-controlled aromaticity partitioning,whereby the six-membered ring retains local Hückel-like aromaticcharacter while the unpaired electrons are preferentially localizedon the adjacent five-membered ring. Chalcogen substitution and functionalizationpreserve this mechanism, with selected substituted iso-type derivativessatisfying the fully adiabatic 2<em>E</em>(<em>T</em><sub>1</sub>) < <em>E</em>(<em>S</em><sub>1</sub>) criterion. These results establish resonance-structure controlas an electronic-structure principle for identifying compact, tunablesinglet-fission chromophore candidates.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13584–13594"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"One-Pot Synthesis of 1-Pyrrolines via Rh2(esp)2-Catalyzed Intermolecular Reaction of Allylic Azides with Diazomalonates Followed by DBU-Mediated Allylic Imine Cyclization","authors":"Yi-Fan Wang, Rui Li, Yang Ji, Peiming Gu","doi":"10.1021/acs.joc.6c00301","DOIUrl":"https://doi.org/10.1021/acs.joc.6c00301","url":null,"abstract":"<p>A one-pot reaction for the synthesisof 1-pyrrolinesfrom allylicazides and diazomalonates has been designed and developed. This conversioninvolves a sequential two-step process of interception of a diazomalonateby the allylic azide and base-mediated cyclization of the resultant <em>N</em>-allyl imine intermediate. Rh<sub>2</sub>(esp)<sub>2</sub> was identified as the optimized catalyst for the initial carbenoidinterception step, while DBU proved to be an effective promoter forthe cyclization step, efficiently affording 30 diverse 1-pyrrolinesin up to 91% yield under very mild conditions.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13777–13783"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149174002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Revival of Thermal Aziridine–Alkene Cycloaddition: Pyrrolidine Synthesis in Terpenoid-Based Deep Eutectic Solvents","authors":"Lalita Radtanajiravong, Nattawadee Nimsawang","doi":"10.1021/acs.joc.6c01138","DOIUrl":"10.1021/acs.joc.6c01138","url":null,"abstract":"<p>A synthesis of pyrrolidines <em>via</em> atom-economicaziridine–alkene cycloaddition mediated by hydrophobic deepeutectic solvents (HDESs) is reported. HDESs, prepared from naturallyoccurring terpenoid compounds, serve as high-boiling reaction mediaand as alternatives to conventional petroleum-based solvents. Thisprotocol proceeds in the presence of air without any special precautions,offering an approach to highly substituted pyrrolidine scaffolds.A broad range of <em>N</em>-aryl aziridines is used as azomethineylide precursors, delivering pyrrolidines in up to 94% isolated yield.The methodology is further extended to a one-pot double cycloadditiondirectly from azide starting material, with solvent reusability andgram-scale synthesis also demonstrated.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13788–13792"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shihao Cheng, Jie Wen, Houli Jiang, Yuhang Zhou, Yi Zhu, Danyang Zhang, Lingyi Kong, Jun Luo
{"title":"Discovery and Total Synthesis of Seco-acorane Sesquiterpenoids from Chloranthus holostegius: Determination of Absolute Configuration and Spontaneous Acetalization","authors":"Shihao Cheng, Jie Wen, Houli Jiang, Yuhang Zhou, Yi Zhu, Danyang Zhang, Lingyi Kong, Jun Luo","doi":"10.1021/acs.joc.6c01558","DOIUrl":"10.1021/acs.joc.6c01558","url":null,"abstract":"<p>Shimianoids A–C, rare nor-acorane sesquiterpenoid(<strong>1</strong>) and aromatic <em>seco</em>-acoranes (<strong>2</strong>/<strong>3</strong>) featuring an aldehyde group, along withtheir spontaneousacetalization products with methanol-<em>d</em><sub>4</sub> (<strong>2a</strong>/<strong>3a</strong>), were isolated and elucidatedfrom <em>Chloranthus holostegius</em> var. <em>shimianensis</em>. The undetermined absolute configurationsof the flexible side chain and intriguing spontaneous acetalizationof compounds <strong>2</strong>/<strong>3</strong> prompted our total synthesisstudy. Ultimately, compounds <strong>2</strong>/<strong>3</strong> and theiracetalization products with methanol-<em>d</em><sub>4</sub> (<strong>2a</strong>/<strong>3a</strong>) and CH<sub>3</sub>OH (<strong>2b</strong>/<strong>3b</strong>) were synthesized via a redox-relay Heck reactionof 4-tolylboronic acid with (±)-sulcatol, followed by oxidationand acetalization. The absolute configurations of C7/10 at the flexibleside chain were determined by Mosher’s and ECD methods of thesynthetic intermediate, and the spontaneous reversible acetalizationwas confirmed. Finally, a library of 26 aromatic <em>seco</em>-acorane sesquiterpenoids was constructed for bioactivity screening.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13667–13673"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yun Luo, Sifeng Li, Peng Li, Bin Cheng, Yixuan He, Si Zhao, Ying Zhang, Ping Wu, Taimin Wang, Peijun Liu
{"title":"Chemodivergent Synthesis of Indole Derivatives: [2 + 3]-Annulation of Oxindole-Derived MBH Carbonates with α-Enolic Dithioesters and Subsequent Branching Transformations","authors":"Yun Luo, Sifeng Li, Peng Li, Bin Cheng, Yixuan He, Si Zhao, Ying Zhang, Ping Wu, Taimin Wang, Peijun Liu","doi":"10.1021/acs.joc.6c01172","DOIUrl":"10.1021/acs.joc.6c01172","url":null,"abstract":"<p>A chemodivergent synthetic strategy for constructinga series ofstructurally diverse indole derivatives has been developed, utilizingoxindole-derived Morita-Baylis-Hillman (MBH) carbonates and α-enolicdithioesters as key building blocks. By leveraging the unique reactivityof both components, including the multisite reactivity of α-enolicdithioesters and the versatile reaction potential of oxindole-basedMBH derivatives, the reaction proceeds via an initial [2 + 3] annulationto afford polysubstituted thiophene scaffolds tethered with an oxindolemotif. This common annulation intermediate undergoes branching transformationsunder tailored reaction conditions: lactam-enolization-mediated trappingdelivers hydrothiophene-tethered indoles, whereas base-promoted skeletalrearrangement furnishes two classes of spirooxindole derivatives spirofusedwith cyclopentadienes or thiopyrans.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13609–13621"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Transition-Metal-Free Regioselective Construction of Cyano- and Phosphonyl Tetrazole Derivatives","authors":"Yufeng Wang, Zeya Xu, Ruiqi Liu, Yuting Zheng, Jia Zhou, Xiaoran Chen, Tingpu Guo, Yulei Zhao","doi":"10.1021/acs.joc.6c01824","DOIUrl":"10.1021/acs.joc.6c01824","url":null,"abstract":"<p>A Brønsted base-promoted, transition-metal-free[3 + 2] cycloadditionfor the regioselective synthesis of cyano- and phosphonyl-substitutedtetrazoles is reported. Compared to readily decomposing diazoniumsalts, the use of arylazo sulfones not only enhances safety but alsoavoids the need for precious metal catalysts. Arylazo sulfones exhibitexcellent reactivity, whereas other commonly used azo compounds arenearly ineffective. Modification of natural products, synthesis ofdual tetrazoles, gram-scale reactions, and investigations into producttransformation further highlight the promising applications.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13743–13748"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rh(III)-Catalyzed Direct C7 Alkylation of Indolines with Nitroalkenes","authors":"Shuang-Liang Liu, Jiejie Wang, Lin Liu, Kaixin Cheng, Hao-Ran Yang, Liming Zhou","doi":"10.1021/acs.joc.6c01873","DOIUrl":"https://doi.org/10.1021/acs.joc.6c01873","url":null,"abstract":"<p>The Rh(III)-catalyzed C7-alkylation of indolines withnitroalkenesunder an ambient atmosphere is disclosed, affording diverse 7-(2-nitroalkyl)indolineswith excellent chemo- and regioselectivity. The directing group isreadily removable, and the resulting products can be oxidized to deliver7-(2-nitroalkyl)indoles. Moreover, a plausible mechanism is proposedon the basis of control experiments.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13812–13817"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}