Xing Wang, Caifu Deng, Yongdong Yang, Aibo Liu, Shenggang Yang, Rong Tan, Ling Li, Lei Tang, Cong Wang
{"title":"Transition-Metal-Free C-1 Arylation of Isoquinolines With Arylhydrazine Salts","authors":"Xing Wang, Caifu Deng, Yongdong Yang, Aibo Liu, Shenggang Yang, Rong Tan, Ling Li, Lei Tang, Cong Wang","doi":"10.1002/jhet.70168","DOIUrl":"https://doi.org/10.1002/jhet.70168","url":null,"abstract":"<div>\u0000 \u0000 <p>A transition-metal-free synthesis of 1-arylisoquinolines has been achieved using arylhydrazine salts as arylating reagents in the presence of K<sub>2</sub>CO<sub>3</sub> and K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. This protocol is metal-free, requires no specific ligands, and is characterized by operational simplicity, reliability, mild conditions, and environmental benignity. It is thus applicable for constructing bioactive molecules containing the 1-arylisoquinoline scaffold.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"710-716"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advancement in the Synthesis of N-Substituted Phenothiazines","authors":"Ishika Taliyan, Khushbu Upadhyay, Shruti, Jaya Dwivedi","doi":"10.1002/jhet.70163","DOIUrl":"https://doi.org/10.1002/jhet.70163","url":null,"abstract":"<div>\u0000 \u0000 <p>N-substituted phenothiazine derivatives are useful heterocycles that are known to have diverse uses in therapeutic agents, electronic devices, and as materials. Earlier approaches for the synthesis of N-substituted phenothiazines are based on nucleophilic substitution, amine coupling, and other routine organic transformations, which frequently require the utilization of environmentally damaging solvents/agents. The appearance of green chemistry has given rise to another synthetic strategy that aims to avoid the use of hazardous substances and to maximize yield. The green approach has various advantages, including time saving, less usage of solvents, and improved yields. Specifically, microwave-induced reactions and solvent-free systems provide higher energy efficiency and purity of the final product. Further, new catalytic methods via green rhodium and palladium catalysts, along with the green solvent Deep Eutectic Solvents, are shown for the synthesis of complex N-substituted phenothiazine derivatives, including the functionalized forms to improve electron transport and photostability, which are beneficial in the application of the materials. This review seeks to present conventional and green synthetic methodologies for the synthesis of N-substituted phenothiazine and to point out both the advantages and disadvantages of each; also, to showcase the possible impact of greener advances for the sustainable synthesis of these multifunctional compounds.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"670-702"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yu Kiu Lau, Chun Pong Hui, Cheuk Long Li, Ho Chung Chang, Man Ho Tse, Ho Kwan Lou, Iat In Chan, Raymond Wai-Yin Sun, Pui Ying Choy, Fuk Yee Kwong
{"title":"Indole-Based π-Extended Monophosphine Ligands for Enhanced Palladium-Catalyzed Sonogashira Coupling","authors":"Yu Kiu Lau, Chun Pong Hui, Cheuk Long Li, Ho Chung Chang, Man Ho Tse, Ho Kwan Lou, Iat In Chan, Raymond Wai-Yin Sun, Pui Ying Choy, Fuk Yee Kwong","doi":"10.1002/jhet.70151","DOIUrl":"https://doi.org/10.1002/jhet.70151","url":null,"abstract":"<p>A general palladium-catalyzed Sonogashira cross-coupling reaction of aryl and heteroaryl chlorides with aliphatic, aryl and heteroaryl alkynes is described. The Pd(dba)₂/<b>PCy<sub>2</sub>-Napdole-phos</b> catalyst system efficiently promotes the reaction, exhibiting broad substrate scope and excellent functional group tolerance. Notably, the catalyst loading can be down to 0.2 mol% Pd. The <b>PCy<sub>2</sub>-Napdole-phos</b>, featuring an extended π-system provides substantial steric bulk to facilitate the construction of C(sp<sup>2</sup>)—C(sp) bonds.</p>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"727-737"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jhet.70151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sanshay Sen, Sudip Mondal, Kousik Giri, Adinath Majee
{"title":"An Efficient Practicable Synthesis of 2,4-Disubstituted Imidazole Derivatives Using Dual Functions of Deep Eutectic Solvent (DES)","authors":"Sanshay Sen, Sudip Mondal, Kousik Giri, Adinath Majee","doi":"10.1002/jhet.70169","DOIUrl":"https://doi.org/10.1002/jhet.70169","url":null,"abstract":"<div>\u0000 \u0000 <p>An efficient and greener one-pot method have been developed for the synthesis of 2,4-disubstituted imidazole derivative by using deep eutectic solvent (DES), via formation of benzamidine, nucleophilic addition and finally liberation of N2 by the formation of hydrogen bond without using any metal, base or additive. Here, DES plays a dual role as alternative solvent and catalyst by giving interesting yields and functional group tolerance in the reaction conditions.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"738-747"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"In-Demand and Now Available: N-Difluoromethylpyrazoles","authors":"Bogdan Ugrak, Tatyana Dutova, Vyacheslav Rusak, Evgeny Tretyakov","doi":"10.1002/jhet.70167","DOIUrl":"https://doi.org/10.1002/jhet.70167","url":null,"abstract":"<div>\u0000 \u0000 <p>We report a method for the difluoromethylation of 3(5)-methylpyrazole, enabling the synthesis of two isomers: 1-(difluoromethyl)-3-methyl-1<i>H</i>\u0000 -pyrazole and 1-(difluoromethyl)-5-methyl-1<i>H</i>\u0000 -pyrazole. These compounds were subsequently used to prepare a range of 4-substituted <i>N</i>-difluoromethylated pyrazole derivatives—a transformation accomplished for the first time. The resulting derivatives serve as versatile precursors for the preparation of diverse <i>N</i>-difluoromethyl–substituted pyrazoles. Such compounds hold significant promise for applications across multiple research fields, ranging from materials science to medicinal chemistry.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"703-709"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Lewis Acid–Catalyzed Annulation of 2(Trifluoroacetyl)pyrroles Leading to CF3-Substituted Polycyclic Quinazolinones","authors":"Karumanchi Susmitha, Akuthota Thulasi, Neelam Yugandhar Sreedhar","doi":"10.1002/jhet.70166","DOIUrl":"https://doi.org/10.1002/jhet.70166","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel and efficient cascade annulation of 2-aminobenzamides with <i>N</i>-aryl 2-(trifluoroacetyl)pyrroles has been developed, providing a straightforward route to CF\u0000 <sub>3</sub>\u0000 -substituted quinazolinones. The reaction proceeds smoothly under mild conditions via a dehydrative annulation pathway, enabling the formation of a C–N bond in a single operation. This transformation effectively incorporates the trifluoromethyl group into the quinazolinone framework, affording structurally diverse CF\u0000 <sub>3</sub>\u0000 -substituted quinazolinones in good to excellent yields. This methodology provides a practical approach for the synthesis of fluorine-containing heterocycles of potential pharmaceutical interest.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"717-726"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdoullah Bimoussa, Abdellah N’Ait Ousidi, Mourad Fawzi, Az-Eddine El Mansouri, Yassine Laamari, Ali Oubella, Aziz Auhmani, Rabiaa Fdil, Hamid Morjani, Anthony Robert, Abdelkhalek Riahi, Jean-Claude Daran, Moulay Youssef Ait Itto
{"title":"Potential Anticancer Agents Based on Monoterpenic Skeleton With Mono and Bis-Isoxazoline Derivatives: Diastereoselective Synthesis, Experimental Study, Evaluation of Biological Activity, and Molecular Docking","authors":"Abdoullah Bimoussa, Abdellah N’Ait Ousidi, Mourad Fawzi, Az-Eddine El Mansouri, Yassine Laamari, Ali Oubella, Aziz Auhmani, Rabiaa Fdil, Hamid Morjani, Anthony Robert, Abdelkhalek Riahi, Jean-Claude Daran, Moulay Youssef Ait Itto","doi":"10.1002/jhet.70158","DOIUrl":"https://doi.org/10.1002/jhet.70158","url":null,"abstract":"<div>\u0000 \u0000 <p>A facile synthesis of fused isoxazolines has been carried out using a 1,3-dipolar cycloaddition reaction of arylonitrile oxides on (R)-Carvone under different stoichiometry conditions. The newly synthesized compounds were fully characterized via spectroscopic analysis and then evaluated for their in vitro antiproliferative properties against four cancer cell lines, namely HT1080, MCF-7, MDA-MB-231, and A-549. All the mono-isoxazolines showed low cytotoxicity (> 100 μM) and the large majority of bis-isoxazolines revealed moderate antiproliferative activity. The derivative <b>11b</b> was the most potent one against HT-1080 and MDA-MB-231 with respective IC<sub>50</sub> values of 14.85 and 15.37 μM. A comprehensive study also showed that bis-isoxazoline 11b induced apoptosis involving a mitochondria-mediated signaling pathway and cell cycle arrest at the G0/G1 phase for HT-1080 and G2/M for MDA-MB-231. Finally, compound <b>11b</b> showed a high binding affinity in the molecular docking study at the binding pockets of the Caspase-3 and Bcl-2 proteins, consistent with the results of biological experiments. Furthermore, this anticancer activity may be triggered by binding to active sites of caspase-3 and Bcl-2.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"590-606"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fatima S. Mehdhar, Ehab Abdel-Latif, Ebrahim Abdel-Galil, Ghada E. Abdel-Ghani
{"title":"Design, Synthesis, and Biological Evaluation of Some New Thiazole-Based Compounds as Antioxidant and Antimicrobial Agents","authors":"Fatima S. Mehdhar, Ehab Abdel-Latif, Ebrahim Abdel-Galil, Ghada E. Abdel-Ghani","doi":"10.1002/jhet.70155","DOIUrl":"https://doi.org/10.1002/jhet.70155","url":null,"abstract":"<div>\u0000 \u0000 <p>This work aims to synthesize novel thiazole analogues through a strategic multicomponent reaction connecting ethyl 2-(2-aminothiazol-4-yl)acetate <b>(1)</b>. The acetohydrazide derivative <b>2</b> is chloroacetylated twice: at the amino and acetohydrazide groups. Reacting the conforming bis-chloroacetamide derivative <b>3</b> with two molar values of 2-mercaptobenzothiazole resulted in the equivalent bissulfide compound <b>4</b>. The base-catalyzed addition of thiazole derivative <b>1</b> to phenyl isothiocyanate afforded intermediate <b>5</b>, which upon subsequent reaction with ethyl bromoacetate yielded the corresponding thiazolyl-thiazolidine derivative <b>6</b>. The heated chloroacetamide <b>7</b> with ammoniumthio cyanate to give thiazolidin-4-one hybrid <b>9</b> was condensed with <b>3</b> aromatic aldehyde derivatives furnishing the corresponding 5-arylidene-2-imino-4-thiazolidinones <b>10a–c</b>, also the synthesized compound <b>7</b> was treated with two kinds of thiocarbamoyl compounds <b>11</b> and <b>13</b> to produce thiazolylthiophenes <b>12</b> and <b>14</b>. Comprehensive structural characterization of the novel synthesized analogues was achieved using elemental analysis and characterized using <sup>1</sup>H NMR, <sup>13</sup>C NMR, FT-IR, and ESI-MS spectroscopy. The designed thiazole-based compounds exhibited broad-spectrum against antioxidant and antimicrobial activities which will facilitate their rational usage in multiple therapeutic applications.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"567-578"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Recent Advances in the Synthesis of Biologically and Pharmaceutically Active Thiazole and Its Analogues","authors":"Khushbu Upadhyaya, Shruti, Rekha Sharma, Jaya Dwivedi","doi":"10.1002/jhet.70170","DOIUrl":"https://doi.org/10.1002/jhet.70170","url":null,"abstract":"<div>\u0000 \u0000 <p>Recently, thiazoles have become essential heterocyclic compounds owing to their versatile applications in various fields. It also plays a major role in the pharmaceutical industry and is a critical scaffold for drug discovery. There are currently a lot of articles reporting the synthesis and functionalization of biological and pharmaceutical functions. To date, a variety of synthesis protocols for scaffold construction have been mentioned in the literature. For instance, classical synthesis protocols like Hantzsch synthesis, Cook-Heilbron synthesis, and Gabriel synthesis have been used to build the main thiazole scaffold. Ultrasound irradiation reactions, microwave-assisted and green reaction protocols are also useful for building and functionalizing this compound. This review's main objective is to draw attention to the synthesis techniques and discoveries that were previously discussed in order to address the drawbacks of synthesis and their environmental effect. In addition, various selected thiazoles and their derivatives with potential biological and pharmaceutical activities will be discussed.</p>\u0000 </div>","PeriodicalId":194,"journal":{"name":"Journal of Heterocyclic Chemistry","volume":"63 4","pages":"748-772"},"PeriodicalIF":2.0,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}