Tetrahedron Letters最新文献_第8页

Rapid, solvent- and catalyst-free transamidation of aliphatic amines with formamide 脂肪胺与甲酰胺的快速、无溶剂和无催化剂的转酰胺反应

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-17 DOI: 10.1016/j.tetlet.2025.155754

Jinting Li , Zihan Zhou , Yinzhe Chen , Qian Zhang

引用次数: 0

Synthesis, optical properties, and alkylation of a methylene-bridged donor–acceptor compound: 10,11-dihydrodithieno[3′,2′:2,3;2″,3″:6,7]-as-indaceno[4,5-c][1,2,5]thiadiazole 亚甲基桥接给受体化合物：10,11-二氢二噻唑[3′，2′：2,3;2″，3″：6,7]-吲哚[4,5-c][1,2,5]噻二唑的合成、光学性质及烷基化反应

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-16 DOI: 10.1016/j.tetlet.2025.155751

Yuta Nakagawa, Kensho Miki, Yoshihiro Yamaguchi, Kunihisa Sugimoto

{"title":"Synthesis, optical properties, and alkylation of a methylene-bridged donor–acceptor compound: 10,11-dihydrodithieno[3′,2′:2,3;2″,3″:6,7]-as-indaceno[4,5-c][1,2,5]thiadiazole","authors":"Yuta Nakagawa, Kensho Miki, Yoshihiro Yamaguchi, Kunihisa Sugimoto","doi":"10.1016/j.tetlet.2025.155751","DOIUrl":"10.1016/j.tetlet.2025.155751","url":null,"abstract":"<div><div>We report the design, synthesis, and photophysical characterization of a novel donor–acceptor–donor (D–A–D)-type π-conjugated molecule, 10,11-dihydro-dithieno[3′,2′:2,3;2″,3″:6,7]-as-indaceno[4,5-c][1,2,5]thiadiazole (<strong>A</strong>). This bridging strategy enabled the construction of a highly planar structure while maintaining structural flexibility at the central benzylic position, which facilitated further molecular modifications. Density functional theory calculations revealed that the methylene-bridged architecture significantly increased the HOMO energy level without substantially affecting the LUMO level, thereby leading to a narrow HOMO–LUMO gap and red-shifted absorption. Photophysical studies indicated that compound <strong>A</strong> displays a broad intramolecular charge transfer (ICT)-derived absorption band at 486 nm and a strong red emission at 638 nm with a relatively high quantum yield (Φ<sub>f</sub> = 0.46), which is particularly notable for red-emitting materials. Despite its increased rigidity, compound <strong>A</strong> displayed an unexpectedly large Stokes shift, which is attributed to the stabilization of the ICT state and enhanced molecular planarity. To improve the solubility of <strong>A</strong>, the sterically hindered methylene bridge was alkylated, obtaining the hexylated product with enhanced solubility in a moderate yield. This methylene-bridging approach offers a versatile platform for tuning the electronic and optical properties of π-conjugated systems and provides valuable insights for the design of next-generation functional organic materials.</div></div>","PeriodicalId":438,"journal":{"name":"Tetrahedron Letters","volume":"169 ","pages":"Article 155751"},"PeriodicalIF":1.5,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selective C–O bond cleavage at benzylic positions enabled by Zirconocene and Photoredox catalysis 锆新世和光氧化还原催化使C-O键在苯基位置的选择性裂解成为可能

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-15 DOI: 10.1016/j.tetlet.2025.155741

Kazuhiro Aida , Ryota Tajima , Eisuke Ota , Junichiro Yamaguchi

引用次数: 0

Recent trends in ionic-liquids mediated synthesis of azepine, diazepine and triazepine 离子液体介导合成氮卓类、二氮卓类和三氮卓类药物的最新进展

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-15 DOI: 10.1016/j.tetlet.2025.155749

Shivangi Jaiswal , Anshita Paliwal , Jaya Dwivedi , Swapnil Sharma

引用次数: 0

Migratory olefination of tertiary boronic esters under Matteson homologation conditions 马特森同源条件下叔硼酯的迁移烯化反应

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-12 DOI: 10.1016/j.tetlet.2025.155740

Debarsee Adhikari, Joseph M. Ready

引用次数: 0

Chelating 5′-(p-hydroxyphenyl)pyridylthiazoles as ratiometric fluorescence probes for d10 metal ions 螯合5 ' -（对羟基苯基）吡啶基噻唑作为d10金属离子的比例荧光探针

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-12 DOI: 10.1016/j.tetlet.2025.155743

Khomidkhodzha Kholikov, Brooke L.S. Boyden, Yuichiro Watanabe , Alexander Wei

{"title":"Chelating 5′-(p-hydroxyphenyl)pyridylthiazoles as ratiometric fluorescence probes for d10 metal ions","authors":"Khomidkhodzha Kholikov, Brooke L.S. Boyden, Yuichiro Watanabe , Alexander Wei","doi":"10.1016/j.tetlet.2025.155743","DOIUrl":"10.1016/j.tetlet.2025.155743","url":null,"abstract":"<div><div>Three fluorescent 5′-(<em>p</em>-hydroxyphenyl)pyridylthiazoles (HPPT) with different chelating groups at the 4′ position were synthesized and evaluated for their ability to detect transition metal ions in acetonitrile and aqueous buffers, based on changes in fluorescence intensity and intramolecular charge transfer (ICT). Both 4’-<em>O</em>-picolyloxy-HPPT (Pic-HPPT) and 4’-<em>O</em>-(<em>o</em>-carboxypicolyl)-HPPT (CPic-HPPT) respond strongly to Zn(II), Cd(II), and Pb(II) in CH<sub>3</sub>CN with a bathochromic shift in emission up to 68 nm, whereas 4’-<em>O</em>-carboxymethyl-HPPT (CM-HPPT) is unresponsive. Only CPic-HPPT responds to <em>d</em><sup>10</sup> metal ions in aqueous phosphate buffered solution (PBS, pH 7.4), attributable to the added chelating power of the <em>ortho</em>-carboxylate. CPic-HPPT forms a 2:1 complex with Zn(II) and a 1:1 complex with Cd(II) and Pb(II) in CH<sub>3</sub>CN, whereas a 1:1 complex forms with Zn(II), Cd(II), and Hg(II) ions in PBS. X-ray structural analysis of 1:1 Pic-HPPT–metal ion complexes reveals a planar tridentate binding motif with Zn(II) but a nonplanar tridentate geometry with the larger Cd(II) ion. Fluorescence titration of CPic-HPPT in PBS with Zn(NO<sub>3</sub>)<sub>2</sub> established sub-micromolar sensitivity with a limit of quantitation at 50 nM. These results show that CPic-HPPT has promise as a fluorescent probe for <em>d</em><sup>10</sup> metal ions in physiologically relevant media.</div></div>","PeriodicalId":438,"journal":{"name":"Tetrahedron Letters","volume":"169 ","pages":"Article 155743"},"PeriodicalIF":1.5,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent progress on phenothiazine organophotoredox catalysis 吩噻嗪类有机光氧化还原催化研究进展

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-11 DOI: 10.1016/j.tetlet.2025.155745

Kenta Tanaka , Hiroyoshi Takamura , Isao Kadota

引用次数: 0

Expedient synthesis of arylphosphonates by the direct C–P coupling of arylboronate esters with dialkyl phosphites 芳硼酸酯与二烷基亚磷酸酯直接C-P偶联制备芳膦酸酯的简便方法

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-10 DOI: 10.1016/j.tetlet.2025.155727

Moriah K. McLellan, Jack T. Hemphill, Sarah J. Petty, Josef D. Daniels, Isabel Serrano, Stephen C. Gaylor, Sheiva Iranfar, Nikita Shibkov, Braylon J. Bailey, Timothy B. Clark

引用次数: 0

New conjugated 2,6-carbazolylazulenes with intense absorption and emission in the visible spectrum 在可见光谱中具有强吸收和发射的新型共轭2,6-咔唑基偶联烯

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-10 DOI: 10.1016/j.tetlet.2025.155746

Nurlan Merkhatuly , Ablaykhan Iskanderov , Amantay Iskanderov , Saltanat Zhokizhanova , Saule Aldabergenova

引用次数: 0

Direct synthesis of pillar[5]quinone and pillar[6]quinone by CAN oxidation of alkylated pillararenes 烷基化柱芳烃的CAN氧化直接合成[5]柱醌和[6]柱醌

IF 1.5 4区化学

Tetrahedron Letters Pub Date : 2025-07-09 DOI: 10.1016/j.tetlet.2025.155739

Venkatesh Bollabathini, Kåre B. Jørgensen

引用次数: 0