1
|
Sartaliya S, Sharma R, Sharma A, Chopra V, Neethu KM, Solanki AK, Ghosh D, Jayamurugan G. Biocidal polymer derived near white light-emitting polymeric carbon particles for antibacterial and bioimaging applications. Photochem Photobiol 2024; 100:1010-1019. [PMID: 38263579 DOI: 10.1111/php.13912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 12/29/2023] [Accepted: 01/12/2024] [Indexed: 01/25/2024]
Abstract
A growing antimicrobial crisis has increased demand for antimicrobial materials. It has become increasingly popular to convert polymeric macromolecules into polymeric carbon particles (PCP) in order to achieve highly biocompatible materials with unique properties as a result of the ability to synthesize nanomaterials of the right size and add value to existing stable polymers. This work presents the tuning of PCP for antibacterial application by combining a biocidal polymer with one-pot solvothermal synthesis. PCP displayed broad-spectrum antibacterial activity via various mechanisms, including inhibition of bacterial cell walls, ROS generation, and antibiotic resistance. Furthermore, these biocidal PCP were observed to show excitation-independent near-white light emission which on the other hand is generally possible due to mixed sizes, doping, and surface effects. As opposed to the parent biocidal polymer, PCP added ROS-mediated bactericidal activity, increased cytocompatibility, and nanofibers with anti-adhesive effects and potential of imaging bacterial cells.
Collapse
Affiliation(s)
- Shaifali Sartaliya
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Raina Sharma
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Anjana Sharma
- Chemical Biology Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Vianni Chopra
- Chemical Biology Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - K M Neethu
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Arun Kumar Solanki
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Deepa Ghosh
- Chemical Biology Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| | - Govindasamy Jayamurugan
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali, Punjab, India
| |
Collapse
|
2
|
Luponosov YN, Solodukhin AN, Aseyev NA, Rokitskaya TI, Kolotova DE, Kotova EA, Kurkin TS, Poletavkina LA, Isaeva YA, Antonenko YN, Balaban PM, Ponomarenko SA. Nanoparticles of Push-Pull Triphenylamine-Based Molecules for Light-Controlled Stimulation of Neuronal Activity. ACS Biomater Sci Eng 2024; 10:1139-1152. [PMID: 38241460 DOI: 10.1021/acsbiomaterials.3c01562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2024]
Abstract
Organic semiconductor materials with a unique set of properties are very attractive for interfacing biological objects and can be used for noninvasive therapy or detection of biological signals. Here, we describe the synthesis and investigation of a novel series of organic push-pull conjugated molecules with the star-shaped architecture, consisting of triphenylamine as a branching electron donor core linked through the thiophene π-spacer to electron-withdrawing alkyl-dicyanovinyl groups. The molecules could form stable aqueous dispersions of nanoparticles (NPs) without the addition of any surfactants or amphiphilic polymer matrixes with the average size distribution varying from 40 to 120 nm and absorption spectra very similar to those of human eye retina pigments such as rods and green cones. Variation of the terminal alkyl chain length of the molecules forming NPs from 1 to 12 carbon atoms was found to be an efficient tool to modulate their lipophilic and biological properties. Possibilities of using the NPs as light nanoactuators in biological systems or as artificial pigments for therapy of degenerative retinal diseases were studied both on the model planar bilayer lipid membranes and on the rat cortical neurons. In the planar bilayer system, the photodynamic activity of these NPs led to photoinactivation of ion channels formed by pentadecapeptide gramicidin A. Treatment of rat cortical neurons with the NPs caused depolarization of cell membranes upon light irradiation, which could also be due to the photodynamic activity of the NPs. The results of the work gave more insight into the mechanisms of light-controlled stimulation of neuronal activity and for the first time showed that fine-tuning of the lipophilic affinity of NPs based on organic conjugated molecules is of high importance for creating a bioelectronic interface for biomedical applications.
Collapse
Affiliation(s)
- Yuriy N Luponosov
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| | - Alexander N Solodukhin
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| | - Nikolay A Aseyev
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Vorobyevy Gory 1, Moscow 119991, Russia
| | - Darya E Kolotova
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Elena A Kotova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Vorobyevy Gory 1, Moscow 119991, Russia
| | - Tikhon S Kurkin
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| | - Liya A Poletavkina
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| | - Yulia A Isaeva
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Vorobyevy Gory 1, Moscow 119991, Russia
| | - Pavel M Balaban
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Sergey A Ponomarenko
- Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya st. 70, Moscow 117393, Russia
| |
Collapse
|
3
|
Yamada M. Perspectives on push-pull chromophores derived from click-type [2 + 2] cycloaddition-retroelectrocyclization reactions of electron-rich alkynes and electron-deficient alkenes. Beilstein J Org Chem 2024; 20:125-154. [PMID: 38292046 PMCID: PMC10825803 DOI: 10.3762/bjoc.20.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 01/04/2024] [Indexed: 02/01/2024] Open
Abstract
Various push-pull chromophores can be synthesized in a single and atom-economical step through [2 + 2] cycloaddition-retroelectrocyclization (CA-RE) reactions involving diverse electron-rich alkynes and electron-deficient alkenes. In this review, a comprehensive investigation of the recent and noteworthy advancements in the research on push-pull chromophores prepared via the [2 + 2] CA-RE reaction is conducted. In particular, an overview of the physicochemical properties of the family of these compounds that have been investigated is provided to clarify their potential for future applications.
Collapse
Affiliation(s)
- Michio Yamada
- Department of Chemistry, Tokyo Gakugei University, Nukuikitamachi 4-1-1, Koganei, Tokyo 184-8501, Japan
| |
Collapse
|
4
|
Dar AH, Ahmad A, Kumar A, Gowri V, Jori C, Sartaliya S, K M N, Ali N, Bishnoi M, Khan R, Jayamurugan G. Superior Photophysical and Photosensitizing Properties of Nanoaggregates of Weakly Emissive Dyes for Use in Bioimaging and Photodynamic Therapy. Biomacromolecules 2023; 24:5438-5450. [PMID: 37856822 DOI: 10.1021/acs.biomac.3c00892] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
The development of luminescent dyes based on 1,1,4,4-tetracyanobuta-1,3-dienes (TCBDs) is an active research area, and a quantum yield (ΦF) of 7.8% has been achieved so far in cyclohexane by appending a fluorophore. Our novel method radically refines weakly emissive 2,3-disubstituted TCBD (phenyl-TCBD 1) (ΦF = 2.3% in CH3CN) into a water-soluble, biocompatible nanoformulation as highly emissive aggregates 1NPs ⊂ PF-127 with ΦF = 7.9% in H2O and without fluorophore conjugation. Characterization of 1NPs ⊂ PF-127 was carried out using various spectroscopic techniques, and its predominant size was found to be 80-100 nm according to transmission electron microscopy and dynamic light scattering techniques. Spectroscopic studies including Fourier transform infrared spectroscopy revealed that aggregated phenyl-TCBD particles were encapsulated in a nonluminescent triblock copolymer (PF-127)-based nanomicelles with the TCBD entrapment efficiency of 77%. With increasing water fraction, the phenyl-TCBD nanoaggregates exhibited a 3-fold higher quantum yield, a greater lifetime, and a red shift (155 nm). This remarkable enhancement in red emissivity enabled them to be used as a bioprobe for bioimaging applications and in photodynamic therapy to selectively target cancer cell lines with singlet oxygen generation capability (ΦΔ = 0.25). According to the MTT assay, compared to the native molecular form (1229 nM), the aggregated 1NPs ⊂ PF-127 (13.51 nM) exhibited dose-dependent cell death when exposed to light with 91-fold increased activity. The histoarchitectures of various vital organs (liver, kidneys, heart, lungs, and spleen) were intact when tested for in vivo biocompatibility. This study has significant implications for developing nonplanar push-pull chromophore-based dyes as biosensors and with potential applications beyond bioimaging.
Collapse
Affiliation(s)
- Arif Hassan Dar
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Anas Ahmad
- Julia McFarlane Diabetes Research Centre (JMDRC) and Department of Microbiology, Immunology and Infectious Diseases, Snyder Institute for Chronic Diseases and Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Ajay Kumar
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Vijayendran Gowri
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Chandrashekhar Jori
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Shaifali Sartaliya
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Neethu K M
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Nemat Ali
- Department of Pharmacology & Toxicology, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mahendra Bishnoi
- National Agri-Food Biotechnology Institute, Mohali, 140306 Punjab, India
| | - Rehan Khan
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| | - Govindasamy Jayamurugan
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306 Punjab, India
| |
Collapse
|
5
|
Shekar Roy H, K M N, Rajput S, Sadhukhan S, Gowri V, Hassan Dar A, Monga M, Salaria N, Guha R, Chattopadhyay N, Jayamurugan G, Ghosh D. Efficient Nitric Oxide Scavenging by Urea-Functionalized Push-Pull Chromophore Modulates NO-Mediated Diseases. Chemistry 2023; 29:e202301748. [PMID: 37431238 DOI: 10.1002/chem.202301748] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/03/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
The excess nitric oxide (NO) produced in the body in response to bacterial/proinflammatory stimuli is responsible for several pathological conditions. The current approaches that target the production of excess NO, either through the inhibition of nitric oxide synthase enzyme or its downstream mediators have been clinically unsuccessful. With an aim to regulate the excess NO, urea-functionalized push-pull chromophores containing 1,1,4,4-tetracyanobuta-1,3-dienes (TCBD) or expanded TCBD (eTCBD) were developed as NO scavengers. The NMR mechanistic studies revealed that upon NO binding, these molecules are converted to uncommon stable NONOates. The unique emissive property of Urea-eTCBD enables its application in vitro, as a NO-sensor. Furthermore, the cytocompatible Urea-eTCBD, rapidly inactivated the NO released from LPS-activated cells. The therapeutic efficacy of the molecule in modulating NO-mediated pathological condition was confirmed using a carrageenan-induced inflammatory paw model and a corneal injury model. While the results confirm the advantages of scavenging the excess NO to address a multitude of NO-mediated diseases, the promising sensing and bioactivity of Urea-eTCBD can motivate further exploration of such molecules in allied areas of research.
Collapse
Affiliation(s)
- Himadri Shekar Roy
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Neethu K M
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Swati Rajput
- Division of Endocrinology and Centre for Research in ASTHI, CSIR-Central Drug Research Institute, Lucknow, 226031, Uttar Pradesh, India
| | - Sreyanko Sadhukhan
- Division of Endocrinology and Centre for Research in ASTHI, CSIR-Central Drug Research Institute, Lucknow, 226031, Uttar Pradesh, India
| | - Vijayendran Gowri
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Arif Hassan Dar
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Malika Monga
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Navita Salaria
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Rajdeep Guha
- Division of Laboratory Animal Facility, CSIR-Central Drug Research Institute, Lucknow, 226031, Uttar Pradesh, India
| | - Naibedya Chattopadhyay
- Division of Endocrinology and Centre for Research in ASTHI, CSIR-Central Drug Research Institute, Lucknow, 226031, Uttar Pradesh, India
| | - Govindasamy Jayamurugan
- Energy Environment Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| | - Deepa Ghosh
- Chemical Biology Unit, Institute of Nano Science and Technology, Knowledge City, Sector-81, Mohali, 140306, Punjab, India
| |
Collapse
|
6
|
Neethu KM, Nag K, Dar AH, Bajaj A, Gopal SA, Gowri V, Nagpure M, Sartaliya S, Sharma R, Solanki AK, Ehesan Ali M, Muthukrishnan A, Jayamurugan G. A study of [2 + 2] cycloaddition-retroelectrocyclization in water: observation of substrate-driven transient-nanoreactor-induced new reactivity. Org Biomol Chem 2023; 21:2922-2929. [PMID: 36943100 DOI: 10.1039/d3ob00053b] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Organic solvents limit [2 + 2] cycloaddition-retroelectrocyclization (CA-RE) in biological fields. We examined the formation of 1,1,4,4-tetracyanobuta-1,3-dienes (TCBDs) through CA-RE reactions and their unusual reactivity to produce N-heterocyclic compounds when the nature of the surfactant and the concentrations were varied in the aqueous phase. An environment in which transient self-assemblies (vesicles) were induced by the substrate and surfactant molecules initiated new reactivity through H2O addition on the TCBD, generating the enol form of the intermediate, which results in the formation of the 6,6-dicyano-heteropentafulvene (amidofulvene) compound, while lamellar sheets at higher concentrations favored TCBD generation. Interestingly, the amidofulvene underwent a clean transformation to 6-membered heterocycles that resemble cardiotonic drugs (milrinone, amrinone) via keto-enol tautomerism mediated by a polar aprotic solvent, opening up a new avenue for drug discovery. Unlike organic-solvent-mediated CA-RE reactions, the present nanoreactor-mediated approach enabled the selective production of TCBDs as well as new heterocycles using H2O as a green solvent. In addition to the widely explored organic electronics/materials, we believe that this study will help to overcome the long-standing limitation of CA-RE reaction applicability in biological fields.
Collapse
Affiliation(s)
- K M Neethu
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Kritika Nag
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Arif Hassan Dar
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Ashima Bajaj
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - S Arya Gopal
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram 695551, Kerala, India
| | - Vijayendran Gowri
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Mithilesh Nagpure
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Shaifali Sartaliya
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Raina Sharma
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Arun Kumar Solanki
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Md Ehesan Ali
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| | - Azhagumuthu Muthukrishnan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram 695551, Kerala, India
| | - Govindasamy Jayamurugan
- Institute of Nano Science and Technology, Knowledge City, Sector 81, SAS Nagar, Manauli PO, Mohali, Punjab 140306, India.
| |
Collapse
|
7
|
Philippe C, Bui AT, Beau M, Bloux H, Riobé F, Mongin O, Roisnel T, Cordier M, Paul F, Lemiègre L, Trolez Y. Synthesis and Photophysical Properties of 1,1,4,4-Tetracyanobutadienes Derived from Ynamides Bearing Fluorophores. Chemistry 2022; 28:e202200025. [PMID: 35199892 DOI: 10.1002/chem.202200025] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Indexed: 12/18/2022]
Abstract
1,1,4,4-Tetracyanobutadienes (TCBDs) bearing a large diversity of fluorophores were prepared following a multi-step synthesis. In a crucial last step, all compounds were obtained from the corresponding ynamides, which were particularly suitable for the formation of the TCBDs in the presence of tetracyanoethylene via a [2+2] cycloaddition/retroelectrocyclization step (CA-RE). Several fluorenyl derivatives in addition to phenanthrenyl and terphenyl ones provided ynamide-based TCBDs affording remarkable emission properties covering a large range of wavelengths. Those compounds emit both in solid state and in solution from the visible region to the NIR range, depending on the molecular structures. Quantum yields in cyclohexane reached unforeseen values for such derivatives, up to 7.8 %. A huge sensitivity to the environment of the TCBDs has also been unraveled for most of the compounds since we observed a dramatic fall of the quantum yields when changing the solvent from cyclohexane to toluene, while they are almost non-emissive in dichloromethane.
Collapse
Affiliation(s)
- Clotilde Philippe
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Anh Thy Bui
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France.,Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, 33400, Talence, France
| | - Maxime Beau
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Hugo Bloux
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - François Riobé
- Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5182 Laboratoire de Chimie, 46 allée d'Italie, 69364, Lyon, France
| | - Olivier Mongin
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Thierry Roisnel
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Marie Cordier
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Frédéric Paul
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Loïc Lemiègre
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| | - Yann Trolez
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes CNRS, ISCR - UMR6226, 35000, Rennes, France
| |
Collapse
|
8
|
Erden K, Dengiz C. 3-Alkynylindoles as Building Blocks for the Synthesis of Electronically Tunable Indole-Based Push-Pull Chromophores. J Org Chem 2022; 87:4385-4399. [PMID: 35230842 PMCID: PMC8938952 DOI: 10.1021/acs.joc.2c00067] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
In this study, two different classes
of push–pull chromophores
were synthesized in modest to excellent yields by formal [2+2] cycloaddition-retroelectrocyclization
(CA-RE) reactions. N-Methyl indole was introduced
as a new donor group to activate alkynes in the CA-RE transformations.
Depending on the side groups’ size and donor/acceptor characteristics, N-methyl indole-containing compounds exhibited λmax values ranging between 378 and 658 nm. The optoelectronic
properties of the reported D–A-type structures were studied
by UV/vis spectroscopy and computational studies. The complete regioselectivity
observed in the products was elaborated by one-dimensional (1D) and
two-dimensional (2D) NMR studies, and the electron donor strength
order of N-alkyl indole and triazene donor groups
was also established. The intramolecular charge-transfer characteristics
of the target push–pull chromophores were investigated by frontier
orbital depictions, electrostatic potential maps, and time-dependent
density functional theory calculations. Overall, the computational
and experimental results match each other. Integrating a new donor
group, N-alkyl indole, into the substrates used in
formal [2+2] cycloaddition-retroelectrocyclizations has significant
potential to overcome the limited donor-substituted substrate scope
problem of CA-RE reactions.
Collapse
Affiliation(s)
- Kübra Erden
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Cagatay Dengiz
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| |
Collapse
|