Sun-Gil Park, Yina Kim, Hye Seung Ko, Jung-Nyoung Heo
{"title":"A Modular and Divergent Strategy for Dibenzo[b,f]oxepine Natural Products: Total Syntheses of Pacharin, Bauhiniastatins 1–4, and Bauhinoxepins C–J and Structural Revision of Bauhinoxepin F","authors":"Sun-Gil Park, Yina Kim, Hye Seung Ko, Jung-Nyoung Heo","doi":"10.1021/acs.joc.6c01760","DOIUrl":"10.1021/acs.joc.6c01760","url":null,"abstract":"<p>We report the development of synthetic routes to representative <em>Bauhinia</em> family natural products, including pacharin,bauhiniastatins 1–4, and bauhinoxepins C–J. The keytransformation involves a one-pot aldol condensation/S<sub>N</sub>Ar sequence to efficiently construct the dibenzo[<em>b,f</em>]oxepine core. Subsequently, a cyano group, employed as a reactivehandle in the aldol reaction, was removed via decyanation. Throughdiverse functional group transformations, a total of 28 <em>Bauhinia</em> family analogs were successfully synthesized,including the originally misassigned bauhinoxepin F (<strong>3d</strong>). In addition, the structure of bauhinoxepin F was subsequentlyrevised based on our synthetic studies.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13710–13723"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088565","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":"Regio- and Diastereo-Controlled (5 + 2) Cycloaddition of gem-Difluorocyclopropenes and Oxidopyridinium Ions","authors":"Jing Liu, Junying Zhang, Kailiang Ding, Guoxin Yang, Jinzhong Yao, Maozhong Miao","doi":"10.1021/acs.joc.6c00926","DOIUrl":"10.1021/acs.joc.6c00926","url":null,"abstract":"<p>A method for the direct synthesisof 3,3-difluoro-9-azatricyclo[3.3.1.0<sup>2,4</sup>]nonanes via a(5 + 2) cycloaddition between a <em>gem</em>-difluorocyclopropeneand an oxidopyridinium ion is reported. Thisapproach furnishes the products in moderate to good yields, with exclusive <em>exo</em>-selectivity and broad substrate compatibility. Its syntheticutility is further demonstrated by a gram-scale reaction and derivatizationstudies.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13784–13787"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088569","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}
Yiqi Yan, Yujie Zhi, Tao Lei, Zijie Zhang, Jie Huang, Hong Hou
{"title":"Visible-Light-Mediated Diastereoselective Hydrophosphorylation of Cyclopropenes","authors":"Yiqi Yan, Yujie Zhi, Tao Lei, Zijie Zhang, Jie Huang, Hong Hou","doi":"10.1021/acs.joc.6c01847","DOIUrl":"10.1021/acs.joc.6c01847","url":null,"abstract":"<p>Herein, we report a visible-lightphotoredox-catalyzeddiastereoselectiveradical hydrophosphorylation protocol for the construction of cyclopropylphosphorusskeletons using an Ir-based complex as the photocatalyst and cyclopropenesas the radical acceptor, providing an efficient and convenient syntheticapproach to a series of phosphonylcyclopropane derivatives in goodto excellent yields. The reaction features broad substrate generalityand excellent functional group compatibility, as well as mild conditions.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13800–13805"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088150","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":"Enantioselective Formal Synthesis of (−)-Neoxaline Enabled by an Asymmetric Ir-Catalyzed Reverse Prenylation","authors":"Jonathan Farhi, Brian M. Stoltz","doi":"10.1021/acs.joc.6c02094","DOIUrl":"https://doi.org/10.1021/acs.joc.6c02094","url":null,"abstract":"<p>We report the enantioselective formal synthesis of neoxaline,anarchetypal member of the oxaline alkaloids. An initial approach employsan asymmetric deaminative cross-coupling to install the 1,1-dimethylallyl(“reverse prenyl”) moiety onto an oxindole framework.Subsequent strategies employ iridium-catalyzed reverse prenylationonto tryptamine scaffolds, enabling the facile construction of a denselyfunctionalized α-carboline framework. The route detailed hereinrepresents a potentially general strategy for the synthesis of relatedoxaline alkaloids.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13771–13776"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188018","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":"A Base Promoted Synthesis of Indazolo[2,3-a]quinolines from Isatogens and 2-(2-Aminophenyl)acetonitriles","authors":"Hunmoina Phukon, Moasosang Aier, Anil K. Saikia","doi":"10.1021/acs.joc.6c01674","DOIUrl":"10.1021/acs.joc.6c01674","url":null,"abstract":"<p>A transition-metal-free, base-promotedone-pot cascadecyclizationstrategy has been developed for the construction of indazolo[2,3-<em>a</em>]quinolines utilizing isatogens and 2-(2-aminophenyl)acetonitrilesas precursors. This protocol enables the simultaneous formation ofC–C, C–N, and N–N bonds to access complex tetracyclicframeworks. Preliminary photophysical characterization reveals significantfluorescence emission, indicating that the compound possesses promisingoptical properties for further investigations. The synthetic utilityof this protocol is further underscored by its application in theRh-catalyzed construction of highly-fused polycyclic cinnolinium salts.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13682–13693"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088571","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":"Modular Strategy for the Collective Total Synthesis of Pandanus amaryllifolius Alkaloids: Pandanusines A and B and Pandamarine","authors":"Edouard Fauran, Jean-Valère Naubron, Laurent Commeiras","doi":"10.1021/acs.joc.6c01791","DOIUrl":"10.1021/acs.joc.6c01791","url":null,"abstract":"<p><em>Pandanus amaryllifolius</em> produces structurallyunique alkaloids, including pandanusines A and B and pandamarine,featuring rare diazaspirocyclic γ-lactam frameworks. Herein,we report concise total syntheses of these three natural productsbased on a modular copper(I)-catalyzed reaction. Readily accessibleγ-hydroxy-γ-lactams were prepared from iodoacrylic acids,terminal alkynes, and primary amines and subsequently transformedthrough <em>N</em>-acyliminium ion intermediates to constructdiazaspirocyclic backbones. This strategy enabled the synthesis of(±)-pandanusine B in four steps (40% overall yield) and (±)-pandanusineA in five steps (26.5% overall yield) after optimization of the protectinggroup strategy. The methodology was further extended to the totalsynthesis of the more complex alkaloid pandamarine. These resultsdemonstrate the synthetic potential of γ-hydroxy-γ-lactamsas versatile precursors for the rapid construction of architecturallycomplex alkaloid scaffolds. Furthermore, the absolute configurationsof both HPLC-separated enantiomers of pandanusine A and B were unambiguouslydetermined through a combination of vibrational and electronic circulardichroism analyses and DFT and TD-DFT calculations.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13724–13734"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092233","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}
Sridhar Regati, Praveen Gajula, Pei-Pei Xie, Anji Chen, Badrinath Kakde, Sailu Munnuri, Lalitha Gummidi, Arun D. R. Shada, Rahul Dilip Shingare, Shanika M. P. Gamage, Nageswara Rao Kalikinidi, Venkatarathnam Nasipireddy, Virendra Tiwari, Srinivasarao Tenneti, Santhosh Reddy Naini, Omkar Revu, Srinivasrao Ganipisetti, Annada Maity, Venumadhav Janganati, Giridhar Basawani, Gopal Sirasani, Rajender Reddy Leleti, Bo Qu, Peng Liu, Chris H. Senanayake
{"title":"Rationally Designed Malonate-Derived Ligands Enable Copper-Catalyzed C–N Coupling via a Cu(I)/Cu(III) Mechanism","authors":"Sridhar Regati, Praveen Gajula, Pei-Pei Xie, Anji Chen, Badrinath Kakde, Sailu Munnuri, Lalitha Gummidi, Arun D. R. Shada, Rahul Dilip Shingare, Shanika M. P. Gamage, Nageswara Rao Kalikinidi, Venkatarathnam Nasipireddy, Virendra Tiwari, Srinivasarao Tenneti, Santhosh Reddy Naini, Omkar Revu, Srinivasrao Ganipisetti, Annada Maity, Venumadhav Janganati, Giridhar Basawani, Gopal Sirasani, Rajender Reddy Leleti, Bo Qu, Peng Liu, Chris H. Senanayake","doi":"10.1021/acs.joc.6c01195","DOIUrl":"10.1021/acs.joc.6c01195","url":null,"abstract":"<p>A class of sterically decorated, malonamide ligands hasbeen developedto enable copper-catalyzed C–N coupling for the synthesis ofpharmaceutically relevant heterocycles. This methodology facilitatesthe efficient coupling of aryl and heteroaryl bromides with a broadrange of nitrogen nucleophiles, including aryl, heteroaryl, and alkylamines, delivering the corresponding products in high yields. Thepractical utility of this approach is highlighted by the streamlinedsynthesis of several active pharmaceutical ingredients, demonstratingboth the generality and scalability of the catalyst system. Densityfunctional theory calculations support a Cu(I)/Cu(III) catalytic cycleas the operative mechanism and reveal that the ligand backbone substituentsaffect the conformation and steric properties of the catalyst systemand the C–N coupling reactivity.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13622–13634"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148727978","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":"Synthesis of Functionalized Cyanamide Derivatives Enabled by Hydrocyanamidation of Activated Alkenes or Alkynes","authors":"Hong-Ding Xie, Xin-Yu Ding, Li-Juan Sun, Ying-Wu Lin, Junliang Zhang, Huamin Wang","doi":"10.1021/acs.joc.6c01925","DOIUrl":"10.1021/acs.joc.6c01925","url":null,"abstract":"<p>The development of practical synthetic strategies forcyanamidesremains a significant challenge. Here, we report a metal-free, fluoride-promotedhydrocyanamidation between readily accessible <em>N</em>-cyano-<em>N</em>-aryl-<em>p</em>-methylbenzenesulfonamide (NCTS)and activated alkenes or alkynes. This method features operationalsimplicity, a broad substrate scope, excellent functional group tolerance,and mild reaction conditions, offering a versatile approach to diversedisubstituted cyanamides. Furthermore, the practicality of this presentmethod was evidenced by gram-scale synthesis and late-stage functionalizationof the product.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13758–13763"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088172","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}
Jing Zhang, Lingling Xiang, Yunshi Liang, Yiting He, Yinjun Wang, Shu Zhang, Yunyao Li, Qin Tang, Song Chen, Hong Qiu
{"title":"Palladium-Catalyzed Fast Decaging of Propargyloxycarbonyl (Proc)-Caged Guanidines","authors":"Jing Zhang, Lingling Xiang, Yunshi Liang, Yiting He, Yinjun Wang, Shu Zhang, Yunyao Li, Qin Tang, Song Chen, Hong Qiu","doi":"10.1021/acs.joc.6c01127","DOIUrl":"10.1021/acs.joc.6c01127","url":null,"abstract":"<p>The Pd-catalyzed decaging reaction enables spatiotemporalcontrolof amine-containing biomolecules, but analogous methods for guanidino-containingsubstrates remain underdeveloped. Here, we report a new Pd-catalyzeddecaging chemistry for guanidines, with a propargyloxycarbonyl (Proc)moiety as the caging group in the absence of a phosphine ligand. Comparedto our previous allyloxycarbonyl (Alloc)-based approach and the classicalamine decaging chemistry, this system achieves remarkably accelerateddecaging kinetics and high efficiency for both aromatic and aliphaticguanidines. Mechanistic studies reveal that the adjacent nitrogenatoms of the guanidino group accelerate the decaging process, probablyin a “self-liganded” manner. Further application ofthis strategy is highlighted by the Pd-triggered release of Proc-cagedguanidinyl fluorophores within minutes in living cells.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13595–13602"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088163","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}
Neethu K. Kunjunny, K. K. Athma Manu, M. P. Muhammad Sibil, Rajeev S. Menon
{"title":"Benzofuran Synthesis from N-Aryloxysulfonamides and 2-Bromoallyl Sulfones via Sequential Treatment with Base and Acid","authors":"Neethu K. Kunjunny, K. K. Athma Manu, M. P. Muhammad Sibil, Rajeev S. Menon","doi":"10.1021/acs.joc.6c01805","DOIUrl":"10.1021/acs.joc.6c01805","url":null,"abstract":"<p>Sequentialtreatment of <em>N</em>-aryloxysulfonamidesand 2-bromoallyl sulfones with cesium carbonate and <em>p</em>-toluenesulfonic acid led to the formation of 2-(arylsulfonylmethyl)benzofurans.An initial <em>formal</em> nucleophilic vinylic substitutionsets the stage for a room-temperature [3,3]-sigmatropic rearrangementof the <em>O</em>-aryl-<em>N</em>-vinyl hydroxylamineintermediate. An allenoate ester also reacted analogously to affordthe corresponding benzofuran-esters.</p>","PeriodicalId":57,"journal":{"name":"Journal of Organic Chemistry","volume":"91 41","pages":"13735–13742"},"PeriodicalIF":3.3,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149088170","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}