1
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Wilcke T, Postole A, Krüsmann M, Karg M, Müller TJJ. Amphipolar, Amphiphilic 2,4-diarylpyrano[2,3- b]indoles as Turn-ON Luminophores in Acidic and Basic Media. Molecules 2022; 27:2354. [PMID: 35408766 PMCID: PMC9000430 DOI: 10.3390/molecules27072354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 03/30/2022] [Accepted: 04/01/2022] [Indexed: 11/29/2022] Open
Abstract
A versatile amphiphilic pyrano[2,3-b]indole for halochromic turn-ON luminescence in acidic or basic media is accessed by an insertion-coupling-cycloisomerization and adjusting solubilizing and phenolic functionalities. While almost non-emissive in neutral solutions, treatment with acids or bases like trifluoroacetic acid (TFA) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) reveals distinct luminescence at wavelengths of 540 nm or 630 nm in propan-2-ol, respectively. Turn-ON emission can be detected at pH values as mild as pH = 5.31 or 8.70. Quantum yields in propan-2-ol are substantial for protonated (Φf = 0.058) and deprotonated (Φf = 0.059) species. Photometrically, pKa1 of 3.5 and pKa2 of 10.5 were determined in propan-2-ol. With lipophilic polyether sidechains and hydrophilic protonation and deprotonation sites the molecule can be regarded as amphipolar, which results in good solubility properties for different organic solvents. In aqueous media, an organic co-solvent like propan-2-ol (35%) or tetrahydrofuran (25%) is needed, and the solution can be diluted with pure water without precipitation of the compound. At higher concentrations of water, a turbid solution is formed, which indicates the formation of micellar structures or clusters. With dynamic light scattering we could show that these clusters increase in size with increasing water content.
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Affiliation(s)
- Tobias Wilcke
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; (T.W.); (A.P.)
| | - Alexandru Postole
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; (T.W.); (A.P.)
| | - Marcel Krüsmann
- Institut für Physikalische Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; (M.K.); (M.K.)
| | - Matthias Karg
- Institut für Physikalische Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; (M.K.); (M.K.)
| | - Thomas J. J. Müller
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; (T.W.); (A.P.)
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2
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Luo Y, Zhong X, Huang JK, He L. Copper-assisted synthesis of dihydropyrano[2.3-b]indole-4-ones by domino cascade reaction. Org Biomol Chem 2021; 19:2692-2702. [PMID: 33666630 DOI: 10.1039/d1ob00078k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel copper-catalyzed cascade intermolecular and intramolecular oxidation/cyclization domino one-pot reaction process for the regioselective synthesis of dihydropyrano[2.3-b]indol-4(9H)-ones has been successfully developed. In this methodology, it is proposed for the first time that the 4-benzyloxy group of indole substrates can be used as a guiding group to promote cyclization under mild conditions. Meanwhile, reaction mechanism studies indicate that carbonyl oxygen in pyranoindole-4-ones came from water and the guiding group is critical to the progress of the reaction.
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Affiliation(s)
- Yang Luo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041, P. R. China.
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3
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Wang M, Xiang Q, Si W, Song R, Yang D, Li M, Lv J. Bioinspired cyclization of in situ generated γ-indolyl β,γ-unsaturated α-keto esters via an oxidative enamine process: facile approaches to pyrano[2,3- b]indoles. Org Chem Front 2021. [DOI: 10.1039/d1qo00996f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A bioinspired cyclization of in situ generated γ-indolyl β,γ-unsaturated α-ketoesters with an oxoammonium salt via an oxidative enamine process has been developed.
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Affiliation(s)
- Man Wang
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Qirui Xiang
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Wen Si
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Ran Song
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Daoshan Yang
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Ming Li
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Jian Lv
- Key Laboratory of Optic-electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
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4
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Wilcke T, Glißmann T, Lerch A, Karg M, Müller TJJ. Acidochromic Turn-on 2,4-Diarylpyrano[2, 3- b
]indole Luminophores with Solubilizing Groups for A Broad Range of Polarity. ChemistrySelect 2018. [DOI: 10.1002/slct.201802743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Tobias Wilcke
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1, D- 40225 Düsseldorf Germany
| | - Tobias Glißmann
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1, D- 40225 Düsseldorf Germany
| | - Arne Lerch
- Institut für Physikalische Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1, D- 40225 Düsseldorf Germany
| | - Matthias Karg
- Institut für Physikalische Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1, D- 40225 Düsseldorf Germany
| | - Thomas J. J. Müller
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1, D- 40225 Düsseldorf Germany
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5
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Schönhaber J, D'Souza DM, Glißmann T, Mayer B, Janiak C, Rominger F, Frank W, Müller TJJ. Domino Insertion-Coupling Synthesis of Solid-State Luminescent Propynylidene Indolones. Chemistry 2018; 24:14712-14723. [DOI: 10.1002/chem.201802237] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 07/10/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Jan Schönhaber
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Daniel M. D'Souza
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69198 Heidelberg Germany
| | - Tobias Glißmann
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Bernhard Mayer
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Frank Rominger
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69198 Heidelberg Germany
| | - Walter Frank
- Institut für Anorganische Chemie und Strukturchemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Thomas J. J. Müller
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69198 Heidelberg Germany
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6
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Wang Q, Niu Y, Wang R, Wu H, Zhang Y. Acid-Induced Shift of Intramolecular Hydrogen Bonding Responsible for Excited-State Intramolecular Proton Transfer. Chem Asian J 2018; 13:1735-1743. [PMID: 29671954 DOI: 10.1002/asia.201800457] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 04/18/2018] [Indexed: 11/10/2022]
Abstract
The significant progress recently achieved in designing smart acid-responsive materials based on intramolecular charge transfer inspired us to utilize excited-state intramolecular proton transfer (ESIPT) for developing a turn-on acid-responsive fluorescent system with an exceedingly large Stokes shift. Two ESIPT-active fluorophores, 2-(2-hydroxyphenyl)pyridine (HPP) and 2-(2-hydroxyphenyl)benzothiazole (HBT), were fused into a novel dye (HBT-HPP) fluorescent only in the protonated state. Moreover, we also synthesized three structurally relevant control compounds to compare their steady-state fluorescence spectra and optimized geometric structures in neutral and acidic media. The results suggest that the fluorescence turn-on was caused by the acid-induced shift of the ESIPT-responsible intramolecular hydrogen bond from the HPP to HBT moiety. This work presents a systematic comparison of the emission efficiencies and basicity of HBT and HPP for the first time, thereby utilizing their differences to construct an acid-responsive smart organic fluorescent material. As a practical application, red fluorescent letters can be written using the acid as an ink on polymer film.
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Affiliation(s)
- Qin Wang
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China
| | - Yahui Niu
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China
| | - Rong Wang
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China
| | - Haoran Wu
- Innovation Experimental College, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China
| | - Yanrong Zhang
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China
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7
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Castanheiro T, Schoenfelder A, Suffert J, Donnard M, Gulea M. Comparative study on the reactivity of propargyl and alkynyl sulfides in palladium-catalyzed domino reactions. CR CHIM 2017. [DOI: 10.1016/j.crci.2016.12.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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8
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Limbach D, Detert H, Schollmeyer D. 2-(4-Chloro-2-nitrophenyl)-5-[4-(propyloxy)phenyl]-1,3,4-oxadiazole. IUCRDATA 2016. [DOI: 10.1107/s241431461601782x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The title compound, C17H14ClN3O4, was prepared by the Huisgen reaction of 4-chloro-2-nitrobenzoyl chloride and 5-(4-propyloxyphenyl)tetrazole. The diphenyl-1,3,4-oxadiazole unit is nearly planar. The oxadiazole ring is inclined to the 4-chloro-2-nitrophenyl ring by 7.77 (8)°, and by 7.93 (8)° to the 4-propyloxyphenyl ring. The benzene rings are inclined to one another by 1.32 (7)°. The nitro group is twisted out of the plane of the benzene ring to which it is attached by 73.59 (16)°. The propoxy chain mean plane is inclined to the benzene ring to which it is attached by 4.46 (13)°. In the crystal, C—H...O and C—H...N hydrogen bonds connect the molecules, forming ribbons propagating along theb-axis direction. The ribbons are linked by C—H...π interactions, forming slabs parallel to theabplane.
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9
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Moni L, Gers-Panther CF, Anselmo M, Müller TJJ, Riva R. Highly Convergent Synthesis of Intensively Blue Emissive Furo[2,3-c
]isoquinolines by a Palladium-Catalyzed Cyclization Cascade of Unsaturated Ugi Products. Chemistry 2016; 22:2020-2031. [DOI: 10.1002/chem.201504335] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Lisa Moni
- Dipartimento di Chimica e Chimica Industriale; University of Genova; Via Dodecaneso 31 16146 Genova Italy
| | - Charlotte F. Gers-Panther
- Institut für Organische Chemie und Makromoleculare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Manuel Anselmo
- Dipartimento di Chimica e Chimica Industriale; University of Genova; Via Dodecaneso 31 16146 Genova Italy
| | - Thomas J. J. Müller
- Institut für Organische Chemie und Makromoleculare Chemie; Heinrich-Heine-Universität Düsseldorf; Universitätsstraße 1 40225 Düsseldorf Germany
| | - Renata Riva
- Dipartimento di Chimica e Chimica Industriale; University of Genova; Via Dodecaneso 31 16146 Genova Italy
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10
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Guo P, Wang C, Chen Y, Ou C, Jiang H, Chen W, Chen W, Cao H. A one pot, metal-free, three-component domino sequence for the synthesis of furans: an efficient C–O and C–N bond formation approach. RSC Adv 2016. [DOI: 10.1039/c6ra05815a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A novel one pot, metal-free, three-component domino reaction for the formation of furan derivatives has been developed from 3-phenylpropiolaldehyde, 1,3-dicarbonyl compounds and aromatic amine or aliphatic acid.
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Affiliation(s)
- Pengfeng Guo
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Changcheng Wang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Ya Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Caijun Ou
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Hangqi Jiang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Weifeng Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Weixin Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Hua Cao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
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11
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Sequentially Palladium-Catalyzed Processes in One-Pot Syntheses of Heterocycles. APPLIED SCIENCES-BASEL 2015. [DOI: 10.3390/app5041803] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Martinez-Ariza G, Nunez-Rios J, Lee YS, Hulme C. Acetyl cyanide as a cyanide source in a tandem catalyst-free modified Groebke–Blackburn–Bienaymé [4+1]-cycloaddition-Strecker cascade. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.127] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Moni L, Denissen M, Valentini G, Müller TJJ, Riva R. Diversity-oriented synthesis of intensively blue emissive 3-hydroxyisoquinolines by sequential Ugi four-component reaction/reductive Heck cyclization. Chemistry 2014; 21:753-62. [PMID: 25369792 DOI: 10.1002/chem.201404209] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 11/09/2022]
Abstract
A convergent approach to highly functionalized 3-hydroxyisoquinolines is reported. The key steps are an Ugi multicomponent reaction and a subsequent intramolecular reductive Heck reaction; these can also be performed as a one-pot procedure. The structures display very interesting properties as blue-fluorescence emitters. Photophysical studies on the absorption and static fluorescence indicate that the substitution pattern on the pyridyl part influences the optical properties only to a minor extent, unless the amide substituent becomes sterically demanding and leads to significant nonradiative deactivation. The donor substitution on the benzo core considerably enhances the fluorescence quantum yields and trimethoxy substitution causes a pronounced redshift of the emission bands. Protonation of the isoquinolyl nitrogen atom causes efficient static quenching of the fluorescence.
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Affiliation(s)
- Lisa Moni
- Dipartimento di Chimica e Chimica Industriale, University of Genova, Via Dodecaneso 31, 16146 Genova (Italy)
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14
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Castanheiro T, Donnard M, Gulea M, Suffert J. Cyclocarbopalladation/Cross-Coupling Cascade Reactions in Sulfide Series: Access to Sulfur Heterocycles. Org Lett 2014; 16:3060-3. [DOI: 10.1021/ol501165h] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Thomas Castanheiro
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS-Unistra, Faculté de Pharmacie, Université de Strasbourg, 74 Route du Rhin, Illkirch, France
| | - Morgan Donnard
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS-Unistra, Faculté de Pharmacie, Université de Strasbourg, 74 Route du Rhin, Illkirch, France
| | - Mihaela Gulea
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS-Unistra, Faculté de Pharmacie, Université de Strasbourg, 74 Route du Rhin, Illkirch, France
| | - Jean Suffert
- Laboratoire d’Innovation
Thérapeutique, UMR 7200 CNRS-Unistra, Faculté de Pharmacie, Université de Strasbourg, 74 Route du Rhin, Illkirch, France
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15
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Muschelknautz C, Visse R, Nordmann J, Müller TJJ. One-pot three-component synthesis and photophysical characteristics of novel triene merocyanines. Beilstein J Org Chem 2014; 10:599-612. [PMID: 24778710 PMCID: PMC3999876 DOI: 10.3762/bjoc.10.51] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 01/28/2014] [Indexed: 01/10/2023] Open
Abstract
Novel triene merocyanines, i.e. 1-styryleth-2-enylidene and 4-(1,3,3-trimethylindolin-2-ylidene)but-2-en-1-ylideneindolones are obtained in good to excellent yields in a consecutive three-component insertion Sonogashira coupling-addition sequence. The selectivity of either series is remarkable and has its origin in the stepwise character of the terminal addition step as shown by extensive computations on the DFT level. All merocyanines display intense absorption bands in solution and the film spectra indicate J-aggregation. While 1-styryleth-2-enylideneindolones show an intense deep red emission in films, 4-(1,3,3-trimethylindolin-2-ylidene)but-2-en-1-ylideneindolones are essentially nonemissive in films or in the solid state. TD-DFT computations rationalize the charge-transfer nature of the characteristic broad long-wavelength absorptions bands.
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Affiliation(s)
- Christian Muschelknautz
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Robin Visse
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Jan Nordmann
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
| | - Thomas J J Müller
- Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
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16
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Consecutive three-component synthesis of film luminescent indolone merocyanines with L-amino acid ester donors. Chem Heterocycl Compd (N Y) 2013. [DOI: 10.1007/s10593-013-1320-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Schmitt V, Moschel S, Detert H. Diaryldistyrylpyrazines: Solvatochromic and Acidochromic Fluorophores. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300463] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Xia XF, Wang N, Zhang L, Song XR, Liu XY, Liang YM. Palladium(II)-Catalyzed Tandem Cyclization/C–H Functionalization of Alkynes for the Synthesis of Functionalized Indoles. J Org Chem 2012; 77:9163-70. [DOI: 10.1021/jo301741j] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Xiao-Feng Xia
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
| | - Ning Wang
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
| | - Lu−Lu Zhang
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
| | - Xian-Rong Song
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
| | - Xue-Yuan Liu
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
| | - Yong-Min Liang
- State Key Laboratory
of Applied
Organic Chemistry, Lanzhou University,
Lanzhou 730000, P. R. China
- State Key Laboratory of Solid
Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, P. R. China
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19
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Xu Z, De Moliner F, Cappelli AP, Hulme C. Ugi/aldol sequence: expeditious entry to several families of densely substituted nitrogen heterocycles. Angew Chem Int Ed Engl 2012; 51:8037-40. [PMID: 22753341 DOI: 10.1002/anie.201202575] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Indexed: 11/08/2022]
Affiliation(s)
- Zhigang Xu
- BIO5 Oro Valley, Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, 1580 E. Hanley Blvd, Oro Valley, AZ 85737, USA
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20
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Xu Z, De Moliner F, Cappelli AP, Hulme C. Ugi/Aldol Sequence: Expeditious Entry to Several Families of Densely Substituted Nitrogen Heterocycles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202575] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Wink C, Detert H. Donor-substituted distyrylpyrazines: influence of steric congestion on UV-Vis absorption and fluorescence. J PHYS ORG CHEM 2012. [DOI: 10.1002/poc.2978] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Christoph Wink
- Institut für Organische Chemie; Duesbergweg 10-14; D-55099; Mainz; Germany
| | - Heiner Detert
- Institut für Organische Chemie; Duesbergweg 10-14; D-55099; Mainz; Germany
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Teiber M, Müller TJJ. Rapid consecutive three-component coupling-Fiesselmann synthesis of luminescent 2,4-disubstituted thiophenes and oligothiophenes. Chem Commun (Camb) 2012; 48:2080-2. [DOI: 10.1039/c2cc17548g] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Xie M, Feng C, Zhang J, Liu C, Fang K, Shu G, Zuo W. CuI-catalyzed tandem carbomagnesiation/carbonyl addition of Grignard reagents with acetylenic ketones: Convenient access to tetrasubstituted allylic alcohols. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.07.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bararjanian M, Hosseinzadeh S, Balalaie S, Bijanzadeh HR, Wolf E. Palladium-catalyzed stereoselective synthesis of 3-(aminomethylene)-oxindoles. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.04.071] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Vlaar T, Ruijter E, Orru RVA. Recent Advances in Palladium-Catalyzed Cascade Cyclizations. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201000979] [Citation(s) in RCA: 225] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schmitt V, Fischer J, Detert H. Linear and angular distyrylpyrazines with terminal donor groups: synthesis, solvatochromism, and acidochromism of the electronic spectra. ISRN ORGANIC CHEMISTRY 2011; 2011:589012. [PMID: 24052825 PMCID: PMC3765758 DOI: 10.5402/2011/589012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2011] [Accepted: 03/07/2011] [Indexed: 11/23/2022]
Abstract
A series of linear and angular distyrylpyrazines and lateral donor groups has been prepared by aldol condensation between dimethylpyrazines and the appropriate aromatic aldehyde. The optical absorption and emission properties of these systems were studied in different solvents and media. The materials display a strong solvatochromism of the emission that is reflected by large red shifts of their fluorescence emission maxima on increasing the solvent polarity. This behaviour suggests a highly polar emitting state, which is characteristic of compounds that undergo an internal charge transfer upon excitation. Upon protonation, the UV-vis spectra are altered, and the fluorescence intensity of the neutral compound vanishes. These molecules can be used as colorimetric and luminescence polarity and pH sensors.
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Affiliation(s)
- Volker Schmitt
- Institute for Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
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Schönhaber J, Müller TJJ. Luminescent bichromophoric spiroindolones – synthesis and electronic properties. Org Biomol Chem 2011; 9:6196-9. [DOI: 10.1039/c1ob05703k] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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