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Xu D, Chang Y, Liu Y, Qin W, Yan H. Mechanistic Features of Asymmetric Vinylidene ortho-Quinone Methide Construction and Subsequent Transformations. ACS Catal 2023. [DOI: 10.1021/acscatal.2c06272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Da Xu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Yu Chang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Yidong Liu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
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2
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Ali S, Israr M. Asymmetric functionalization of benzenes via an organocatalytic hetero-Diels-Alder reaction. Chem Commun (Camb) 2022; 58:9851-9854. [PMID: 35975717 DOI: 10.1039/d2cc03161b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Benzene derivatives are readily available and stable sources of substrates that can be transformed into complex three-dimensional structures via asymmetric synthesis. The increasing complexity and chirality of products are crucial for functional materials and drug discovery. While planar aromatics can be converted into enantioenriched products by catalytic asymmetric dearomatization reactions, most of the methods are limited to heteroarenes and activated arenes. Available transition metal-catalyzed and/or photoredox methods using nonactivated arenes are rare. This paper highlights the most recent studies directed toward the development of the first organocatalytic asymmetric dearomatizing strategy to access complex stereochemical products from nonactivated arenes via harnessing the unique reactivity of in situ generated chiral vinylidene ortho-quinone methides (VQMs). With this methodology, nonactivated benzenes were regioselectively converted into chiral spirocyclic products and chiral oxahelicenes with excellent stereoselectivities. Mechanistic studies revealed the formation of a chiral VQM that disrupts the aromaticity of benzenes via a hetero-Diels-Alder reaction.
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Affiliation(s)
- Shaukat Ali
- Institute of Chemical Sciences, University of Peshawar, Old Jamrud Road, Qadir Abad, Peshawar 25120, Khyber Pakhtunkhwa, Pakistan.
| | - Muhammad Israr
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
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3
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Liu H, Li K, Huang S, Yan H. An Isolable Vinylidene ortho-Quinone Methide: Synthesis, Structure and Reactivity. Angew Chem Int Ed Engl 2022; 61:e202117063. [PMID: 35171537 DOI: 10.1002/anie.202117063] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Indexed: 12/29/2022]
Abstract
Commonly, an elusive intermediate is generated from a precursor and then trapped and consumed in a reaction. Vinylidene ortho-quinone methides (VQMs) have been demonstrated as transient axially chiral intermediates in asymmetric catalysis due to their orthogonal π-bonds forming an allene motif. The current understanding of VQMs is primarily based on time-resolved absorption, trapping experiments and computational studies. Herein, we report the first isolation and comprehensive characterization of a VQM, including crystallographic analysis. The disturbed aromaticity of the VQM led to its high reactivity as an electrophile or a 4π-component capable of asymmetric dearomatization of an electron-deficient phenyl group. Notably, the VQM could be isolated in enantiomerically enriched form, and the subsequent transformation was stereospecific, indicating that the generation of the VQM was involved in the enantiodetermining step. This study paves the way for the direct application of VQMs as starting materials.
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Affiliation(s)
- Hong Liu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P.R. China
| | - Kai Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P.R. China
| | - Shengli Huang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P.R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P.R. China
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4
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Wang Y, Yang Y, Xu S, Huang A, Chen L, Xie Y, Liu P, Hong L, Li G. Organocatalytic enantioselective construction of axially chiral (1 H)-isochromen-1-imines. Org Biomol Chem 2022; 20:3277-3282. [PMID: 35373230 DOI: 10.1039/d2ob00379a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heterocycloalkenyl atropisomers, derived from biaryl atropisomers and axially chiral styrenes, have emerged as a new class of nonbiaryl C-C atropisomers due to the benefit in improving the pharmacological activity and structural diversity. This paper proposes an intramolecular annulation strategy for constructing the heterocycloalkenyl atropisomers (1H)-isochromen-1-imines by organocatalysis. Various heterocycloalkenyl atropisomers (1H)-isochromen-1-imines were prepared in good to excellent yields with excellent enantioselectivity (up to 98% ee), and could be easily converted to atropisomeric lactones isocoumarins.
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Affiliation(s)
- Ying Wang
- School of Pharmaceutical Sciences, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen 518060, China.
| | - Yang Yang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Shiyu Xu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Aima Huang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Lu Chen
- School of Pharmaceutical Sciences, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen 518060, China.
| | - Yubao Xie
- School of Pharmaceutical Sciences, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen 518060, China.
| | - Pengyutian Liu
- School of Pharmaceutical Sciences, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen 518060, China.
| | - Liang Hong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Guofeng Li
- School of Pharmaceutical Sciences, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen 518060, China.
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5
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Liu H, Li K, Huang S, Yan H. An Isolable Vinylidene
ortho‐
Quinone Methide: Synthesis, Structure and Reactivity. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hong Liu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research Chemical Biology Research Center School of Pharmaceutical Sciences Chongqing University Chongqing 401331 P.R. China
| | - Kai Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research Chemical Biology Research Center School of Pharmaceutical Sciences Chongqing University Chongqing 401331 P.R. China
| | - Shengli Huang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research Chemical Biology Research Center School of Pharmaceutical Sciences Chongqing University Chongqing 401331 P.R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research Chemical Biology Research Center School of Pharmaceutical Sciences Chongqing University Chongqing 401331 P.R. China
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Non-Covalent Interactions in Enantioselective Organocatalysis: Theoretical and Mechanistic Studies of Reactions Mediated by Dual H-Bond Donors, Bifunctional Squaramides, Thioureas and Related Catalysts. Catalysts 2021. [DOI: 10.3390/catal11050569] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Chiral bifunctional dual H-bond donor catalysts have become one of the pillars of organocatalysis. They include squaramide, thiosquaramide, thiourea, urea, and even selenourea-based catalysts combined with chiral amines, cinchona alkaloids, sulfides, phosphines and more. They can promote several types of reactions affording products in very high yields and excellent stereoselectivities in many cases: conjugate additions, cycloadditions, the aldol and Henry reactions, the Morita–Baylis–Hilman reaction, even cascade reactions, among others. The desire to understand mechanisms and the quest for the origins of stereoselectivity, in attempts to find guidelines for developing more efficient catalysts for new transformations, has promoted many mechanistic and theoretical studies. In this review, we survey the literature published in this area since 2015.
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Zhang W, Wang C, Guan L, Peng M, Li K, Lin Y. A non-enzymatic electrochemical biosensor based on Au@PBA(Ni-Fe):MoS 2 nanocubes for stable and sensitive detection of hydrogen peroxide released from living cells. J Mater Chem B 2020; 7:7704-7712. [PMID: 31754682 DOI: 10.1039/c9tb02059d] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hydrogen peroxide (H2O2) is the main product of enzymatic reactions and plays an important role in biological processes. The detection of H2O2 inside organisms or cells is critical. Here, we report a nickel-iron Prussian blue analogue nanocube doped with molybdenum disulfide and Au nanoparticles (Au@PBA(Ni-Fe):MoS2) as an electrochemical sensing material for the stable detection of H2O2 in neutral solutions for a long time. First, the Prussian blue analogue (PBA(Ni-Fe)) is synthesized by a simple charge-assembly technology, and then etched into PBA(Ni-Fe):MoS2 hollow nanocubes by a high-temperature hydrothermal reaction. Finally, Au nanoparticles are reduced inside the PBA(Ni-Fe):MoS2in situ to generate Au@PBA(Ni-Fe):MoS2 nanocubes. Ni-doping enhances the nanocube's stability in neutral solutions; as a result, the sensor can maintain a stable current response towards H2O2 reduction for more than 1 h. The sensing material can meet the needs of a long-time test. The introduction of Au enhances the electron transfer efficiency, which endows the sensor with good reduction ability for H2O2 at 0 V over a wide linear range (0.5-200 μM and 210-3000 μM) and with a low detection limit (0.23 μM (S/N = 3)), which fulfills the requirements for the detection of H2O2 in a biological system. The sensor can sense H2O2 released from cells stimulated by ascorbic acid. Au@PBA(Ni-Fe):MoS2 provides good guidance for the future development of efficient biosensors to be applied in cell biology.
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Affiliation(s)
- Wang Zhang
- Department of Chemistry, Capital Normal University, Beijing, 100048, China.
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8
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Luo X, Zhong K, Lan Y. Mechanism of Palladium‐Catalyzed Spiroannulation of Naphthols with Alkynes: A Density Functional Theory Study. ChemCatChem 2020. [DOI: 10.1002/cctc.202000613] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xiaoling Luo
- Chongqing Key Laboratory of Inorganic Functional Materials College of Chemistry Chongqing Normal University Chongqing 401331 P. R. China
| | - Kangbao Zhong
- Chongqing Key Laboratory of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Chongqing University Chongqing 400030 P. R. China
| | - Yu Lan
- Chongqing Key Laboratory of Theoretical and Computational Chemistry School of Chemistry and Chemical Engineering Chongqing University Chongqing 400030 P. R. China
- College of Chemistry and Institute of Green Catalysis Zhengzhou University Zhengzhou Henan 450001 P. R. China
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9
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Deng Q, Wang Y, Li SJ, Qu LB, Lan Y, Wei D. Origin and stabilization of axial chirality in the construction of naphthyl-C2-indoles: a DFT study. Org Chem Front 2020. [DOI: 10.1039/d0qo00936a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A novel method for predicting the stabilization of axial chirality in the construction of naphthyl-C2-indoles has been suggested for the first time.
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Affiliation(s)
- Qianqian Deng
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou 450002
- P.R. China
| | - Shi-Jun Li
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Ling-Bo Qu
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yu Lan
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Donghui Wei
- College of Chemistry
- and Institute of Green Catalysis
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
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10
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Rodriguez J, Bonne D. Enantioselective organocatalytic activation of vinylidene-quinone methides (VQMs). Chem Commun (Camb) 2019; 55:11168-11170. [PMID: 31486436 DOI: 10.1039/c9cc05097c] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Vinylidene-quinone methides (VQMs) are highly electrophilic chiral reagents that can be generated in situ from 2-(phenylethynyl)phenols. They were characterized for the first time in 2012 but their enantioselective organocatalytic activation was addressed only very recently. Their specific reactivity has revealed innovative strategies notably for the control of axial chirality.
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Affiliation(s)
- Jean Rodriguez
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille, France.
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