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Ren J, Sun Z, Zhao S, Huang J, Wang Y, Zhang C, Huang J, Zhang C, Zhang R, Zhang Z, Ji X, Shao Z. Enantioselective synthesis of chiral α,α-dialkyl indoles and related azoles by cobalt-catalyzed hydroalkylation and regioselectivity switch. Nat Commun 2024; 15:3783. [PMID: 38710722 DOI: 10.1038/s41467-024-48175-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 04/23/2024] [Indexed: 05/08/2024] Open
Abstract
General, catalytic and enantioselective construction of chiral α,α-dialkyl indoles represents an important yet challenging objective to be developed. Herein we describe a cobalt catalyzed enantioselective anti-Markovnikov alkene hydroalkylation via the remote stereocontrol for the synthesis of α,α-dialkyl indoles and other N-heterocycles. This asymmetric C(sp3)-C(sp3) coupling features high flexibility in introducing a diverse set of alkyl groups at the α-position of chiral N-heterocycles. The utility of this methodology has been demonstrated by late-stage functionalization of drug molecules, asymmetric synthesis of bioactive molecules, natural products and functional materials, and identification of a class of molecules exhibiting anti-apoptosis activities in UVB-irradiated HaCaT cells. Ligands play a vital role in controlling the reaction regioselectivity. Changing the ligand from bi-dentate L6 to tridentate L12 enables CoH-catalyzed Markovnikov hydroalkylation. Mechanistic studies disclose that the anti-Markovnikov hydroalkylation involves a migratory insertion process while the Markovnikov hydroalkylation involves a MHAT process.
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Affiliation(s)
- Jiangtao Ren
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
- Southwest United Graduate School, 650092, Kunming, China
| | - Zheng Sun
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
| | - Shuang Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
- School of Pharmacy, Yunnan University, 650500, Kunming, China
| | - Jinyuan Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
- School of Pharmacy, Yunnan University, 650500, Kunming, China
| | - Yukun Wang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
| | - Cheng Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
- School of Pharmacy, Yunnan University, 650500, Kunming, China
| | - Jinhai Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
| | - Chenhao Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
| | - Ruipu Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China
- School of Pharmacy, Yunnan University, 650500, Kunming, China
| | - Zhihan Zhang
- College of Chemistry, Central China Normal University, 430079, Wuhan, China.
| | - Xu Ji
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China.
- School of Pharmacy, Yunnan University, 650500, Kunming, China.
| | - Zhihui Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, 650500, Kunming, China.
- Southwest United Graduate School, 650092, Kunming, China.
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Nicolini T, Marquez AV, Goudeau B, Kuhn A, Salinas G. In Situ Spectroelectrochemical-Conductance Measurements as an Efficient Tool for the Evaluation of Charge Trapping in Conducting Polymers. J Phys Chem Lett 2021; 12:10422-10428. [PMID: 34672581 DOI: 10.1021/acs.jpclett.1c03108] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In situ UV-vis-NIR spectroelectrochemistry has been intensively used to evaluate the electronic transitions during the charging/discharging process of π-conjugated polymers. However, the type of charge carrier and the mechanisms of their transport, remains still a point of discussion. Herein, the coupling between UV-vis-NIR spectroscopy and in situ electrochemical-conductance measurements is proposed to compare the doping process of three different thiophene-based conducting polymers. The simultaneous monitoring of electrical and absorption properties, associated with low energy electronic transitions characteristic for polarons and bipolarons, was achieved. In addition, this method allows evaluating the reversible charge trapping mechanism of poly-3,4-o-xylendioxythiophene (PXDOT), caused by the formation of σ-dimers, making it a very useful tool to determine relevant physicochemical properties of conductive materials.
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Affiliation(s)
- Tommaso Nicolini
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, ENSCBP, F-33607 Pessac, France
| | | | - Bertrand Goudeau
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, ENSCBP, F-33607 Pessac, France
| | - Alexander Kuhn
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, ENSCBP, F-33607 Pessac, France
| | - Gerardo Salinas
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, ENSCBP, F-33607 Pessac, France
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Xiao C, Zhao Y, Zhou W. Nanoimprinted conducting nanopillar arrays made of MWCNT/polymer nanocomposites: a study by electrochemical impedance spectroscopy. NANOSCALE ADVANCES 2021; 3:556-566. [PMID: 36131730 PMCID: PMC9419572 DOI: 10.1039/d0na00200c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 11/26/2020] [Indexed: 06/15/2023]
Abstract
Conducting vertical nanopillar arrays can serve as three-dimensional nanostructured electrodes with improved electrical recording and electrochemical sensing performance in bio-electronics applications. However, vertical nanopillar-array electrodes made of inorganic conducting materials by the conventional nanofabrication approach still face challenges in terms of high manufacturing costs, poor scalability, and limited carrier substrates. Here, we report a new type of conducting nanopillar array composed of multi-walled carbon nanotube (MWCNT) doped polymeric nanocomposites, which are manufactured on the wafer-scale on both rigid and flexible substrates by direct nanoimprinting of perfluoropolyether nanowell-array templates into uncured MWCNT/polymer mixtures. By controlling the MWCNT ratios and the annealing temperatures during the fabrication process, MWCNT/polymer nanopillar arrays can be endowed with outstanding electrical properties with high DC conductivity (∼4 S m-1) and low AC electrochemical impedance (∼104 Ω at 1000 Hz). Moreover, by electrochemical impedance spectroscopy (EIS) measurements and equivalent circuit modeling analysis, we can decompose the overall impedance of the MWCNT/polymer nanopillar arrays in the electrolyte into multiple bulk and interfacial circuit components, and can thus illustrate their different dependences on the MWCNT ratios and the annealing temperatures. In particular, we find that an appropriate annealing process can significantly reduce the anomalous ion diffusion impedance and improve the MWCNT/polymer nanopillars' impedance properties in the electrolyte.
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Affiliation(s)
- Chuan Xiao
- Department of Electrical and Computer Engineering, Virginia Tech Blacksburg VA 24060 USA
| | - Yuming Zhao
- Department of Electrical and Computer Engineering, Virginia Tech Blacksburg VA 24060 USA
| | - Wei Zhou
- Department of Electrical and Computer Engineering, Virginia Tech Blacksburg VA 24060 USA
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Bruce IJ. Novel and Improved Nanomaterials, Chemistries and Apparatus for Nanobiotechnology: the NACBO Project. Nanomedicine (Lond) 2011; 6:187-93. [DOI: 10.2217/nnm.10.155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This article outlines the nature and activities of the recently completed EU Framework Programme 6 Integrated Project, Novel and Improved Nanomaterials, Chemistries and Apparatus for Nanobiotechnology (NACBO). This project was designed to yield new nanomaterials, surface activation and synthetic nucleic acid chemistries, procedures and hardware for applications in forensics and diagnostics. It provides details on the project’s structure and partnership along with its principal objectives and successes in terms of publications and commercial exploitation.
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Affiliation(s)
- Ian James Bruce
- Nanobiotechnology Research Group, School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, UK
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