1
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Shikari A, Parida C, Chandra Pan S. Catalytic Asymmetric Dearomatization of 2,3-Disubstituted Indoles by a [4 + 2] Cycloaddition Reaction with In Situ Generated Vinylidene ortho-Quinone Methides: Access to Polycyclic Fused Indolines. Org Lett 2024; 26:5057-5062. [PMID: 38489515 DOI: 10.1021/acs.orglett.4c00557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
A protocol of enantioselective dearomatization of 2,3-disubstituted indoles by an organocatalytic intermolecular (4 + 2) cycloaddition reaction with in situ generated vinylidene ortho-quinone methide has been documented. A wide range of polycyclic 2,3-fused indolines containing vicinal quaternary carbon stereocenters was readily prepared in high yields and with excellent diastereo- and enantioselectivities.
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Affiliation(s)
- Amit Shikari
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Chandrakanta Parida
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
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2
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Meher R, Pan SC. Organocatalytic Asymmetric Dearomative Spirocyclization/Oxa-Michael Addition Sequence: Synthesis of Polycyclic Tetralones. Org Lett 2024; 26:3179-3183. [PMID: 38568111 DOI: 10.1021/acs.orglett.4c00781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Herein, an organocatalytic asymmetric dearomative spirocyclization/oxa-Michael addition sequence with a newly designed substrate having two naphthol motifs has been developed. The reaction proceeds through in situ chiral vinylidene ortho-quinone methide (VQM) intermediate formation, dearomative spirocyclization of naphthol, and an oxa-Michael addition reaction. The densely functionalized tetralone products were formed in high yields with high diastereo- and enantioselectivities.
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Affiliation(s)
- Ramji Meher
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
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3
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Liu CY, Zhao J, Pan CX, Mo DL, Ma XP, Huang WY. Copper(I)-Catalyzed Dearomatization of Benzofurans with 2-(Chloromethyl)anilines through Radical Addition and Cyclization Cascade. Org Lett 2024. [PMID: 38190623 DOI: 10.1021/acs.orglett.3c03964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Herein, we described a copper(I)-catalyzed dearomatization of benzofurans with 2-(chloromethyl)anilines to prepare various tetrahydrobenzofuro[3,2-b]quinolines and 2-(quinolin-2-yl)phenols in good to excellent yields through radical addition and an intramolecular cyclization process. Mechanistic studies revealed that 2-(chloromethyl)anilines served as radical precursors. The present method features broad substrate scope, good functional group tolerance, quinoline scaffold diversity, and radical addition dearomatization of benzofurans.
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Affiliation(s)
- Chong-Yu Liu
- Guangxi Key Laboratory of Drug Discovery and Optimization, Guangxi Engineering Research Center for Pharmaceutical Molecular Screening and Druggability Evaluation, College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
| | - Jin Zhao
- Guangxi Key Laboratory of Drug Discovery and Optimization, Guangxi Engineering Research Center for Pharmaceutical Molecular Screening and Druggability Evaluation, College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
| | - Cheng-Xue Pan
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Xiao-Pan Ma
- Guangxi Key Laboratory of Drug Discovery and Optimization, Guangxi Engineering Research Center for Pharmaceutical Molecular Screening and Druggability Evaluation, College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
| | - Wan-Yun Huang
- Guangxi Key Laboratory of Drug Discovery and Optimization, Guangxi Engineering Research Center for Pharmaceutical Molecular Screening and Druggability Evaluation, College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
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4
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Liu S, Chan KL, Lin Z, Sun J. Asymmetric Synthesis of Remotely Chiral Naphthols and Naphthylamines via Naphthoquinone Methides. J Am Chem Soc 2023. [PMID: 37276009 DOI: 10.1021/jacs.3c03557] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Quinone methides are well-established intermediates in asymmetric synthesis. In contrast, their extended analogues with the carbonyl and methide units distributed across two different rings have not been exploited in asymmetric synthesis. Herein, we achieved the first asymmetric process involving such intermediates. Specifically, the use of suitable chiral phosphoric acids enabled in situ generation of 2-naphthoquinone 8-methides and the corresponding aza counterparts for mild one-pot asymmetric nucleophilic addition. These processes provided rapid access to a wide range of previously less accessible remotely chiral naphthols and naphthylamines with both high efficiency and excellent enantioselectivity. Control experiment and DFT calculations provided important insights into the reaction mechanism, which likely involves two phosphoric acid molecules in the enantiodetermining transition states. This work serves as a proof of concept for the exploitation of new types of extended quinone methides as versatile intermediates for asymmetric synthesis, thus providing a new platform for the efficient construction of remote benzylic stereogenic centers of aromatic compounds.
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Affiliation(s)
- Shuxuan Liu
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon 999077, Hong Kong SAR, China
- Shenzhen Research Institute, HKUST, No. 9 Yuexing 1st Rd, Shenzhen 518057, China
- Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Ka Lok Chan
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon 999077, Hong Kong SAR, China
| | - Zhenyang Lin
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon 999077, Hong Kong SAR, China
| | - Jianwei Sun
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon 999077, Hong Kong SAR, China
- Shenzhen Research Institute, HKUST, No. 9 Yuexing 1st Rd, Shenzhen 518057, China
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5
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Cai WY, Ding QN, Zhou L, Chen J. Asymmetric Synthesis of Axially Chiral Molecules via Organocatalytic Cycloaddition and Cyclization Reactions. Molecules 2023; 28:molecules28114306. [PMID: 37298781 DOI: 10.3390/molecules28114306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/19/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
Atropisomeric molecules are present in many natural products, biologically active compounds, chiral ligands and catalysts. Many elegant methodologies have been developed to access axially chiral molecules. Among them, organocatalytic cycloaddition and cyclization have attracted much attention because they have been widely used in the asymmetric synthesis of biaryl/heterobiaryls atropisomers via construction of carbo- and hetero-cycles. This strategy has undoubtedly become and will continue to be a hot topic in the field of asymmetric synthesis and catalysis. This review aims to highlight the recent advancements in this field of atropisomer synthesis by using different organocatalysts in cycloaddition and cyclization strategies. The construction of each atropisomer, its possible mechanism, the role of catalysts, and its potential applications are illustrated.
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Affiliation(s)
- Wei-Yun Cai
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, China
| | - Qian-Ni Ding
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710127, China
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6
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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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7
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Cai B, Cui Y, Zhou J, Wang YB, Yang L, Tan B, Wang JJ. Asymmetric Hydrophosphinylation of Alkynes: Facile Access to Axially Chiral Styrene-Phosphines. Angew Chem Int Ed Engl 2023; 62:e202215820. [PMID: 36424372 DOI: 10.1002/anie.202215820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/24/2022] [Accepted: 11/24/2022] [Indexed: 11/27/2022]
Abstract
A Cu/CPA co-catalytic system has been developed for achieving the direct hydrophosphinylation of alkynes with phosphine oxides in delivering novel axially chiral phosphorus-containing alkenes in high yields and excellent enantioselectivities (up to 99 % yield and 99 % ee). DFT calculations were performed to elucidate the reaction pathway and the origin of enantiocontrol. This streamlined and modular methodology establishes a new platform for the design and application of new axially chiral styrene-phosphine ligands.
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Affiliation(s)
- Baohua Cai
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Yuan Cui
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jian Zhou
- Department of Chemistry, Hong Kong Baptist University, Hong Kong, China
| | - Yong-Bin Wang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Limin Yang
- College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Bin Tan
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jun Joelle Wang
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055, China.,Department of Chemistry, Hong Kong Baptist University, Hong Kong, China
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8
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Sun J, Zhang W, Song R, Yang D, Lv J. Divergent Coupling of ortho-Alkynylnaphthols and Benzofurans: [4 + 2] Cycloaddition and Friedel-Crafts Reaction. J Org Chem 2023; 88:442-454. [PMID: 36520642 DOI: 10.1021/acs.joc.2c02431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Catalytic direct [4 + 2] cycloaddition reactions and Friedel-Crafts reactions of ortho-alkynylnaphthols with benzofurans have been developed, affording functionalized hydrobenzofuro[3,2-b]chromans and hydroarylation products, respectively, in high yields with high chemoselectivity.
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Affiliation(s)
- Jiaying Sun
- 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
| | - Wenxuan Zhang
- 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
| | - 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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9
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Gou B, Tang Y, Lin Y, Yu L, Jian Q, Sun H, Chen J, Zhou L. Modular Construction of Heterobiaryl Atropisomers and Axially Chiral Styrenes via All‐Carbon Tetrasubstituted VQMs. Angew Chem Int Ed Engl 2022; 61:e202208174. [DOI: 10.1002/anie.202208174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Indexed: 02/06/2023]
Affiliation(s)
- Bo‐Bo Gou
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Yue Tang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Yan‐Hong Lin
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Le Yu
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Qing‐Song Jian
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Huai‐Ri Sun
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science National Demonstration Center for Experimental Chemistry Education Northwest University Xi'an 710127 P. R. China
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10
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Qin W, Liu Y, Yan H. Enantioselective Synthesis of Atropisomers via Vinylidene ortho-Quinone Methides (VQMs). Acc Chem Res 2022; 55:2780-2795. [PMID: 36121104 DOI: 10.1021/acs.accounts.2c00486] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Atropisomers, arising from conformational restriction, are inherently chiral due to the intersecting dissymmetric planes. Since there are numerous applications of enantiopure atropisomers in catalyst design, drug discovery, and material science, the asymmetric preparation of these highly prized molecules has become a flourishing field in synthetic chemistry. A number of catalysts, synthetic procedures, and novel concepts have been developed for the manufacture of the atropisomeric molecules. However, due to the intrinsic properties of different types of atropisomers featuring biaryl, hetero-biaryl, or non-biaryl architectures, only very few methods pass the rigorous inspection and are considered generally applicable. The development of a broadly applicable synthetic strategy for various atropisomers is a challenge. In this Account, we summarize our recent studies on the enantioselective synthesis of atropisomers using the vinylidene ortho-quinone methides (VQMs) as pluripotent intermediates.The most appealing features of VQMs are the disturbed aromaticity and axial chirality of the allene fragment. At the outset, the applications of VQMs in organic synthesis have been neglected due to their principal liabilities: ephemeral nature, extraordinary reactivity, and multireaction sites. The domestication of this transient intermediate was demonstrated by in situ catalytic asymmetric generation of VQMs, and the reactivity and selectivity were fully explored by judiciously modifying precursors and tuning catalytic systems. A variety of axially chiral heterocycles were achieved through five-, six-, seven- and nine-membered ring formation of VQM intermediates with different kinds of branched nucleophilic functional groups. The axially chiral C-N axis could be constructed from VQM intermediates via N-annulation or desymmetrization of preformed C-N scaffolds. We take advantage of the high electrophilicity of VQMs toward a series of sulfur and carbon based nucleophiles leading to atropisomeric vinyl arenes. Furthermore, chiral helical compounds were realized by cycloaddition or consecutive annulation of VQM intermediates. These achievements demonstrated that the VQMs could work as a nuclear parent for the collective synthesis of distinct and complex optically active atropisomers. Recently, we have realized the isolation and structural characterization of the elusive VQMs, which were questioned as putative intermediates for decades. The successful isolation of VQMs provided direct evidence for their existence and an unprecedented opportunity to directly investigate their reactivity. The good thermal stability and reserved reactivity of the isolated VQMs demonstrated their great potential as synthetic reagents and expanded the border of VQM chemistry.
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Affiliation(s)
- Wenling Qin
- 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
| | - Yidong 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
| | - 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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11
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Gou BB, Tang Y, Lin YH, Yu L, Jian QS, Sun HR, Chen J, Zhou L. Modular Construction of Heterobiaryl Atropisomers and Axially Chiral Styrenes via All‐Carbon Tetrasubstituted VQMs. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Bo-Bo Gou
- Northwest University College of Chemistry & Materials Science CHINA
| | - Yue Tang
- Northwest University College of Chemistry & Materials Science CHINA
| | - Yan-Hong Lin
- Northwest University College of Chemistry & Materials Science CHINA
| | - Le Yu
- Northwest University College of Chemistry & Materials Science CHINA
| | - Qing-Song Jian
- Northwest University College of Chemistry & Materials Science CHINA
| | - Huai-Ri Sun
- Northwest University College of Chemistry & Materials Science CHINA
| | - Jie Chen
- Northwest University College of Chemistry & Materials Science CHINA
| | - Ling Zhou
- Northwest University College of Chemistry & Materials Science 1 Xuefu Ave., Chang’an District 710127 Xi'an CHINA
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12
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Jia S, Tian Y, Li X, Wang P, Lan Y, Yan H. Atroposelective Construction of Nine-Membered Carbonate-Bridged Biaryls. Angew Chem Int Ed Engl 2022; 61:e202206501. [PMID: 35621411 DOI: 10.1002/anie.202206501] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Indexed: 12/27/2022]
Abstract
We herein demonstrated an efficient method for the atroposelective construction of nine-membered carbonate-bridged biaryls through vinylidene ortho-quinone methide (VQM) intermediates. Diverse products with desirable pharmacological features were synthesized in satisfying yields and good to excellent enantioselectivities. In subsequent bioassays, several agents showed considerable antiproliferative activity via the mitochondrial-related apoptosis mechanism. Further transformations produced more structural diversity and may inspire new ideas for developing functional molecules.
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Affiliation(s)
- Shiqi Jia
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, 450001, Henan, P. R. China
| | - Yuhong Tian
- 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
| | - Xin 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
| | - Pengfei Wang
- 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
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, 450001, Henan, P. R. China.,School of Chemistry and Chemical Engineering, 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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13
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Tian Y, Wu F, Jia S, Gong X, Mao H, Wang P, Qin W, Yan H. Organocatalytic Asymmetric Construction of Tetrasubstituted Carbon Stereocenters Bearing Three Heteroatoms via Intramolecular Cyclization of Vinylidene ortho-Quinone Methide with Imidates. Org Lett 2022; 24:5073-5077. [PMID: 35819168 DOI: 10.1021/acs.orglett.2c01842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report herein an organocatalytic asymmetric protocol for the construction of tetrasubstituted carbon stereocenters bearing three heteroatoms. The reaction proceeded via the enantioselective intramolecular cyclization reaction of vinylidene ortho-quinone methide (VQM) with imidates to form pentacyclic heterocycles. The formed tetrasubstituted carbon center was stable under a high temperature and the conditions for further transformations.
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Affiliation(s)
- Yuhong Tian
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Fengdi Wu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Shiqi Jia
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Xiangnan Gong
- Analytical and Testing Center of Chongqing University, Chongqing University, Chongqing 401331, P. R. China
| | - Hui Mao
- College of Pharmacy, Jinhua Polytechnic, Jinhua, Zhejiang 321007, P. R. China
| | - Pengfei Wang
- 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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14
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Jia S, Tian Y, Li X, Wang P, Lan Y, Yan H. Atroposelective Construction of Nine‐Membered Carbonate Bridged Biaryls. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shiqi Jia
- Zhengzhou University Green Catalysis Center 重庆大学虎溪校区药学院 zhengzhou CHINA
| | - Yuhong Tian
- Chongqing University School of Pharmaceutical Sciences Chongqing CHINA
| | - Xin Li
- Chongqing University School of Pharmaceutical Sciences CHINA
| | - Pengfei Wang
- Chongqing University School of Pharmaceutical Sciences CHINA
| | - Yu Lan
- Chongqing University School of Chemistry and Chemical Engineering CHINA
| | - Hailong Yan
- Chongqing University Innovative Drug Research Center No.55 Daxuecheng South Rd 401331 Chongqing CHINA
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15
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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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16
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Yu X, Meng QY, Daniliuc CG, Studer A. Aroyl Fluorides as Bifunctional Reagents for Dearomatizing Fluoroaroylation of Benzofurans. J Am Chem Soc 2022; 144:7072-7079. [PMID: 35315651 PMCID: PMC9052760 DOI: 10.1021/jacs.2c01735] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The 2,3-dihydrobenzofuran scaffold is widely found in natural products and biologically active compounds. Herein, dearomatizing 2,3-fluoroaroylation of benzofurans with aroyl fluorides as bifunctional reagents to access 2,3-difunctionalized dihydrobenzofurans is reported. The reaction that occurs by cooperative NHC/photoredox catalysis provides 3-aroyl-2-fluoro-2,3-dihydrobenzofurans with moderate to good yield and high diastereoselectivity. Cascades proceed via radical/radical cross-coupling of a benzofuran radical cation generated in the photoredox catalysis cycle with a neutral ketyl radical formed through the NHC catalysis cycle. The redox-neutral transformation exhibits broad substrate scope and high functional group compatibility. With anhydrides as bifunctional reagents, dearomatizing aroyloxyacylation of benzofurans is achieved and the strategy can also be applied to N-acylated indoles to afford 3-aroyl-2-fluoro-dihydroindoles.
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Affiliation(s)
- Xiaoye Yu
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
| | - Qing-Yuan Meng
- Institute of Chemistry, Chinese Academy of Sciences (CAS), Laboratory of Molecular Recognition and Function, 100190 Beijing, China
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
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17
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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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18
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Gorai S, Junghare V, Kundu K, Gharui S, Kumar M, Patro BS, Nayak SK, Hazra S, Mula S. Synthesis of Dihydrobenzofuro[3,2-b]chromenes as a potential 3CLpro inhibitors of SARS-CoV-2: A molecular docking and dynamics simulation study. ChemMedChem 2022; 17:e202100782. [PMID: 35112482 PMCID: PMC9015348 DOI: 10.1002/cmdc.202100782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Indexed: 11/29/2022]
Abstract
The recent emergence of pandemic of coronavirus (COVID‐19) caused by SARS‐CoV‐2 has raised significant global health concerns. More importantly, there is no specific therapeutics currently available to combat against this deadly infection. The enzyme 3‐chymotrypsin‐like cysteine protease (3CLpro) is known to be essential for viral life cycle as it controls the coronavirus replication. 3CLpro could be a potential drug target as established before in the case of severe acute respiratory syndrome coronavirus (SARS‐CoV) and Middle East respiratory syndrome coronavirus (MERS‐CoV). In the current study, we wanted to explore the potential of fused flavonoids as 3CLpro inhibitors. Fused flavonoids (5a,10a‐dihydro‐11H‐benzofuro[3,2‐b]chromene) are unexplored for their potential bioactivities due to their low natural occurrences. Their synthetic congeners are also rare due to unavailability of general synthetic methodology. Here we designed a simple strategy to synthesize 5a,10a‐dihydro‐11H‐benzofuro[3,2‐b]chromene skeleton and it's four novel derivatives. Our structural bioinformatics study clearly shows excellent potential of the synthesized compounds in comparison to experimentally validated inhibitor N3. Moreover, in‐silico ADMET study displays excellent druggability and extremely low level of toxicity of the synthesized molecules. Further, for better understanding, the molecular dynamic approach was implemented to study the change in dynamicity after the compounds bind to the protein. A detailed investigation through clustering analysis and distance calculation gave us sound comprehensive data about their molecular interaction. In summary, we anticipate that the currently synthesized molecules could not only be a potential set of inhibitors against 3CLpro but also the insights acquired from the current study would be instrumental in further developing novel natural flavonoid based anti‐COVID therapeutic spectrums.
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Affiliation(s)
- Sudip Gorai
- Bhabha Atomic Research Centre, Department of Atomic Energy, INDIA
| | - Vivek Junghare
- IIT Roorkee: Indian Institute of Technology Roorkee, Biotechnology, INDIA
| | - Kshama Kundu
- Bhabha Atomic Research Centre, Department of Atomic Energy, INDIA
| | | | - Mukesh Kumar
- Bhabha Atomic Research Centre, Department of Atomic Energy, INDIA
| | | | - Sandip K Nayak
- Bhabha Atomic Research Centre, Department of Atomic Energy, INDIA
| | - Saugata Hazra
- IIT Roorkee: Indian Institute of Technology Roorkee, Biotechnology, INDIA
| | - Soumyaditya Mula
- Bhabha Atomic Research Centre, Bio-Organic Division, 1-28H, Modular Laboratory, 400085, Mumbai, INDIA
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19
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Zhang W, Song R, Yang D, Lv J. Construction of Axially Chiral Styrenes Linking an Indole Moiety by Chiral Phosphoric Acid. J Org Chem 2022; 87:2853-2863. [DOI: 10.1021/acs.joc.1c02750] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Wenxuan Zhang
- Key Laboratory of Optic-Electric Sensing and Analytic Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and 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 and 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 and 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 and Technology, Qingdao 266042, China
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20
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Jia S, Qin W, Wang P, Yan H. Organocatalytic atroposelective construction of axially chiral nonsymmetric biaryltriols and their applications in asymmetric synthesis and heavy metal ion detection. Org Chem Front 2022. [DOI: 10.1039/d1qo01821c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Organocatalytic atroposelective construction of axially chiral nonsymmetric biaryltriols and their applications in asymmetric synthesis and heavy metal ion detection.
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Affiliation(s)
- Shiqi Jia
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing 401331, P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing 401331, P. R. China
| | - Pengfei Wang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing 401331, P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing 401331, P. R. China
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21
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Hu F, Wang L, Wang P, Ding Z, Chen Y, Xu L, Liu XL, Li SS. Switchable construction of oxa-heterocycles with diverse ring sizes via chemoselective cyclization controlled by dibrominated compounds. Org Chem Front 2022. [DOI: 10.1039/d2qo01273a] [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
Switchable construction of oxa-heterocycles with diverse ring sizes has been developed by performing dibrominated-compound-controlled chemoselective cyclization and subsequent derivatization.
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Affiliation(s)
- Fangzhi Hu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Liang Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Peng Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Zhanshuai Ding
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Yuzhuo Chen
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Lubin Xu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiong-Li Liu
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food, Guizhou University, Guiyang 550025, P. R. China
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
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22
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He Y, Wu P, Zhang X, Wang T, Tao Q, Zhou K, Ouyang Z, Zhai H, Cheng DJ, Cheng B. Synthesis of aryl-fused 1,4-oxathiepines from pyridinium 1,4-zwitterionic thiolates and vinylidene ortho-quinone methides. Org Chem Front 2022. [DOI: 10.1039/d2qo00735e] [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
Synthesis of aryl-fused 1,4-oxathiepines from pyridinium 1,4-zwitterionic thiolates with vinylidene ortho-quinone methides generated in situ via a formal (3 + 4) pathway.
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Affiliation(s)
- Yixuan He
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
| | - Ping Wu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou College, Dezhou 253023, China
| | - Xiang Zhang
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Taimin Wang
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
| | - Qingqing Tao
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
| | - Kang Zhou
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
| | - Zijun Ouyang
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
| | - Hongbin Zhai
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
- State Key Laboratory of Chemical Oncogenomics, Shenzhen Engineering Laboratory of Nano Drug Slow-Release, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Dao-Juan Cheng
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei 230012, China
| | - Bin Cheng
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China
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23
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Liang H, Zhu G, Pu X, Qiu L. Copper-Catalyzed Enantioselective C-H Arylation between 2-Arylindoles and Hypervalent Iodine Reagents. Org Lett 2021; 23:9246-9250. [PMID: 34806895 DOI: 10.1021/acs.orglett.1c03596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The copper-catalyzed enantioselective C-H arylation between 2-arylindoles and hypervalent iodine reagents has been successfully developed, which provides a convenient and economical route to the highly atroposelective synthesis of axially chiral indole derivatives with a 2-aryl structure (up to 99% ee). Density functional theory calculations and wave function analysis show that the key "sandwich" intermediate leads to high enantioselectivity of the reaction.
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Affiliation(s)
- Hao Liang
- School of Chemistry, Guangdong Provincial Key Laboratory of Chiral Molecules and Drug Discovery, Sun Yat-Sen University, Guangzhou 510006, China
| | - Guoxun Zhu
- Electronic/IT-related Chemicals Lab, Guangdong Institute of Analysis, Guangzhou 510070, China
| | - Xiaoyun Pu
- School of Chemistry, Guangdong Provincial Key Laboratory of Chiral Molecules and Drug Discovery, Sun Yat-Sen University, Guangzhou 510006, China
| | - Liqin Qiu
- School of Chemistry, Guangdong Provincial Key Laboratory of Chiral Molecules and Drug Discovery, Sun Yat-Sen University, Guangzhou 510006, China
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24
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Jia S, Chang Y, Tian Y, Mao H, Qin W, Wang P, Yan H. Organocatalytic cascade reactions for multi-functionalized chiral cyclic ethers through vinylidene ortho-quinone methides. Chem Commun (Camb) 2021; 57:11334-11337. [PMID: 34642730 DOI: 10.1039/d1cc05340j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
An organocatalytic approach to installing various alcohols into the carbonyl of α,β-unsaturated ketones mediated by VQM intermediates was achieved, followed by dearomatization to provide the stereo-defined cyclic ethers via a cascade process. Along with the transformations, this strategy affords efficient access to the underexplored chiral cyclic ether chemospace.
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Affiliation(s)
- Shiqi Jia
- 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.
| | - Yuhong Tian
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Hui Mao
- College of Pharmacy, Jinhua Polytechnic, Jinhua, Zhejiang Province 321007, 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.
| | - Pengfei Wang
- 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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25
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Huang S, Wen H, Tian Y, Wang P, Qin W, Yan H. Organocatalytic Enantioselective Construction of Chiral Azepine Skeleton Bearing Multiple‐Stereogenic Elements. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108040] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- 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
| | - Haojun Wen
- 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
| | - Yuhong Tian
- 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
| | - Pengfei Wang
- 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
| | - Wenling Qin
- 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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26
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Huang S, Wen H, Tian Y, Wang P, Qin W, Yan H. Organocatalytic Enantioselective Construction of Chiral Azepine Skeleton Bearing Multiple-Stereogenic Elements. Angew Chem Int Ed Engl 2021; 60:21486-21493. [PMID: 34235834 DOI: 10.1002/anie.202108040] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Indexed: 12/19/2022]
Abstract
Enantioselective construction of molecules bearing multiple stereogenic elements is increasingly related to the synthesis of enantiopure natural products, pharmaceuticals, and functional materials. However, atom-economical and enantioselective approaches to install multiple stereogenic elements in a small molecular template by limited chemical transformation remain challenging. We describe an organocatalytic enantioselective method for the preparation of polychiral molecules bearing four types of stereogenic elements in fused azepines via vinylidene ortho-quinone methide (VQM)-mediated intramolecular electrophilic aromatic substitution. This method was proved robust with a wide range of substrate scope (46-92 % yield), with excellent diastereoselectivity (>20:1 dr) and enantioselectivity achieved (up to 97 % ee). Optical properties and Ru3+ -induced fluorescence responses of these compounds suggest their potential applications in optoelectronic materials and heavy metal ion detection.
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Affiliation(s)
- 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
| | - Haojun Wen
- 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
| | - Yuhong Tian
- 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
| | - Pengfei Wang
- 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
| | - Wenling Qin
- 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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27
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Xu MM, You XY, Zhang YZ, Lu Y, Tan K, Yang L, Cai Q. Enantioselective Synthesis of Axially Chiral Biaryls by Diels-Alder/Retro-Diels-Alder Reaction of 2-Pyrones with Alkynes. J Am Chem Soc 2021; 143:8993-9001. [PMID: 34106720 DOI: 10.1021/jacs.1c04759] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The enantioselective synthesis of axially chiral biaryls by a copper-catalyzed Diels-Alder/retro-Diels-Alder reaction of 2-pyrones with alkynes is reported herein. Using electron-deficient 2-pyrones and electron-rich 1-naphthyl acetylenes as the reaction partners, a broad range of axially chiral biaryl esters are obtained in excellent yields (up to 97% yield) and enantioselectivities (up to >99% ee). DFT calculations reveal the reaction mechanism and provide insights into the origins of the stereoselectivities. The practicality and robustness of this reaction are showcased by gram-scale synthesis. The synthetic utilizations are demonstrated by the amenable transformations of the products.
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Affiliation(s)
- Meng-Meng Xu
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Xin-Yu You
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Yu-Zhen Zhang
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Yang Lu
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Kui Tan
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Limin Yang
- College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
| | - Quan Cai
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China
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28
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Qi SS, Yin H, Wang YF, Wang CJ, Han HT, Man TT, Xu DQ. Catalytic Asymmetric Conjugate Addition/Hydroalkoxylation Sequence: Expeditious Access to Enantioenriched Eight-Membered Cyclic Ether Derivatives. Org Lett 2021; 23:2471-2476. [PMID: 33733793 DOI: 10.1021/acs.orglett.1c00392] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A sequential enantioselective conjugate addition/hydroalkoxylation between in situ generated ortho-quinomethanes and ynones by combining bifunctional squaramide and DBU catalysis has been developed. A variety of eight-membered cyclic ethers with two contiguous tertiary stereocenters were obtained in high yields with excellent stereoselectivities. This reaction not only provides a new strategy for constructing enantioenriched eight-membered cyclic ethers but also demonstrates the practicability of ynones as C4-syntons for the synthesis of chiral medium-membered rings.
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Affiliation(s)
- Suo-Suo Qi
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Hao Yin
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Yi-Feng Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Chao-Jie Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Hong-Te Han
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Tong-Tong Man
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Dan-Qian Xu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Key Laboratory of Green Pesticides and Cleaner Production Technology of Zhejiang Province, Department of Green Chemistry and Technology, Zhejiang University of Technology, Hangzhou 310014, PR China
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29
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Nair SR, Baire B. Recent Dearomatization Strategies of Benzofurans and Benzothiophenes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100025] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Sindoori R. Nair
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Beeraiah Baire
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
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30
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Wang L, Zhu H, Peng T, Yang D. Conjugated ynones in catalytic enantioselective reactions. Org Biomol Chem 2021; 19:2110-2145. [PMID: 33625439 DOI: 10.1039/d0ob02521f] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Conjugated ynones are easily accessible feedstock and the existence of an alkyne bond endows ynones with different attractive reactivities, thus making them unique substrates for catalytic asymmetric reactions. Their compatibility under organocatalytic, metal-catalyzed as well as cooperative catalytic conditions has resulted in numerous enantioselective transformations. Importantly, conjugated ynones can act as nucleophiles or electrophiles, and serve as easily accessed synthons for different cyclization pathways. This review summarizes the recent literature examples of the catalytic reactions of conjugated ynones and related compounds such as alkyne conjugated α-ketoesters, and classifies these reaction types alongside mechanistic insights whenever possible. We aim to trigger more intensive research in the future to render the asymmetric transformation of ynones as a common and reliable tool for asymmetric synthesis.
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Affiliation(s)
- Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Tianyu Peng
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Drug Design & Synthesis, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
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31
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Gicquiaud J, Abadie B, Dhara K, Berlande M, Hermange P, Sotiropoulos JM, Toullec PY. Brønsted Acid-Catalyzed Enantioselective Cycloisomerization of Arylalkynes. Chemistry 2020; 26:16266-16271. [PMID: 32975325 DOI: 10.1002/chem.202003783] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/21/2020] [Indexed: 01/09/2023]
Abstract
The first example of an enantioselective carbocyclization of an alkyne-containing substrate catalyzed by chiral Brønsted acids was achieved. The use of the 2-hydroxynaphthyl substituent on the alkyne as a directing group constituted the key parameter enabling both efficient regioselective protonation of the carbon-carbon triple bond and chiral induction. The key cationic intermediate could be depicted either as a cationic vinylidene ortho-quinone methide or a stabilized vinyl cation. Atropoisomeric phenanthrenes derivatives were produced in high yields and good enantioselectivities under mild, metal-free reaction conditions in the presence of chiral N-triflylphosphoramide catalysts. The carbenic nature of the cationic intermediate was also exploited to describe an example of alkyne/alkane cycloisomerization.
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Affiliation(s)
- Julien Gicquiaud
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
| | - Baptiste Abadie
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
| | - Kalyan Dhara
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
| | - Murielle Berlande
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
| | - Philippe Hermange
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
| | - Jean-Marc Sotiropoulos
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour, l'Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 avenue du Président Angot, 64053, Pau Cedex 09, France
| | - Patrick Y Toullec
- CNRS, Bordeaux INP, ISM, UMR 5255, University of Bordeaux, 33400, Talence, France
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32
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Li T, Liu S, Tan W, Shi F. Catalytic Asymmetric Construction of Axially Chiral Indole‐Based Frameworks: An Emerging Area. Chemistry 2020; 26:15779-15792. [DOI: 10.1002/chem.202001397] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 04/27/2020] [Indexed: 01/28/2023]
Affiliation(s)
- Tian‐Zhen Li
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Si‐Jia Liu
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Wei Tan
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Feng Shi
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
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33
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Göricke F, Haseloff S, Laue M, Schneider M, Brumme T, Schneider C. Phosphoric Acid Catalyzed Formation of Hydrogen-Bonded o-Quinone Methides. Enantioselective Cycloaddition with β-Dicarbonyl Compounds toward Benzannulated Oxygen Heterocycles. J Org Chem 2020; 85:11699-11720. [DOI: 10.1021/acs.joc.0c01375] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Fabian Göricke
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Stefan Haseloff
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Michael Laue
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Maximilian Schneider
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Thomas Brumme
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Linnéstraße 2, 04103 Leipzig, Germany
- Theoretische Chemie, Technische Universität Dresden, Bergstraße 66c, 01062 Dresden, Germany
| | - Christoph Schneider
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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34
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Tang Q, He X, Zhang J, Zhou T, Xie M, Li R, Zuo Y, Shang Y. Selective synthesis of 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via FeCl
3
‐mediated cascade reactions of propargylamines with
β
‐enamino ketones. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5676] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Qiang Tang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Xinwei He
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Jinxue Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Tongtong Zhou
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Mengqing Xie
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Ruxue Li
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Youpeng Zuo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
| | - Yongjia Shang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule‐Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 People's Republic of China
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35
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Tan Y, Zhao Z, Chen Z, Huang S, Jia S, Peng L, Xu D, Qin W, Yan H. N-Iodosuccinimide-Mediated Dimerization of 2-Alkynylnaphthols: A Highly Diastereoselective Construction of Bridged Polycyclic Compounds via Vinylidene ortho-Quinone Methide Intermediate. Org Lett 2020; 22:4461-4466. [DOI: 10.1021/acs.orglett.0c01458] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yu Tan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Zhengxing Zhao
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Zhili Chen
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Shengli Huang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Shiqi Jia
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Lei Peng
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P.R. China
| | - Da Xu
- 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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36
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Li QZ, Lian PF, Tan FX, Zhu GD, Chen C, Hao Y, Jiang W, Wang XH, Zhou J, Zhang SY. Organocatalytic Enantioselective Construction of Heterocycle-Substituted Styrenes with Chiral Atropisomerism. Org Lett 2020; 22:2448-2453. [DOI: 10.1021/acs.orglett.0c00659] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Quan-Zhe Li
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Peng-Fei Lian
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Fu-Xin Tan
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Guo-Dong Zhu
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Chao Chen
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Yu Hao
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Wei Jiang
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Xun-Hui Wang
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Jia Zhou
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Shu-Yu Zhang
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs, School of Chemistry and Chemical Engineering & Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
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37
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Yu X, Lan W, Li J, Bai H, Qin Z, Fu B. Enantioselective one-pot synthesis of 4 H-chromene derivatives catalyzed by a chiral Ni( ii) complex. RSC Adv 2020; 10:44437-44441. [PMID: 35517147 PMCID: PMC9058437 DOI: 10.1039/d0ra08906k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 11/16/2020] [Indexed: 12/15/2022] Open
Abstract
A Ni(ii)–bis(oxazoline) complex and p-TSOH are used to form enantioenriched 4H-chromenes from ortho-quinone methides (o-QMs) and dicarbonyls, providing the desired products in up to 95% ee. The method is compatible with various β-ketoester substrates, and the products obtained could be converted into biologically active 4H-chromene derivatives. A Ni(ii)–bis(oxazoline) complex and p-TSOH are used to form enantioenriched 4H-chromenes from ortho-quinone methides (o-QMs) and dicarbonyls, providing the desired products in up to 95% ee.![]()
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Affiliation(s)
- Xuan Yu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
| | - Wenjie Lan
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
| | - Jiaqi Li
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
| | - Hui Bai
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
| | - Zhaohai Qin
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
| | - Bin Fu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Repubic of China
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38
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Omote M, Karuo Y, Dousei S, Sakamoto M, Tarui A, Sato K, Kawai K. Construction of Quaternary Carbon Center by the Reaction of Aza-o-Quinone Methide Mediated Carbocation Intermediate. HETEROCYCLES 2020. [DOI: 10.3987/com-19-s(f)33] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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39
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Huang HM, Wu XY, Leng BR, Zhu YL, Meng XC, Hong Y, Jiang B, Wang DC. Cu(ii)-Catalyzed formal [4 + 2] cycloaddition between quinone methides (QMs) and electron-poor 3-vinylindoles. Org Chem Front 2020. [DOI: 10.1039/c9qo01343a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A new Cu(ii)-catalyzed formal [4 + 2] cycloaddition between quinone methides (QMs) including para-quinone methides (p-QMs) and ortho-quinone methides (o-QMs) and electron-poor 3-vinylindoles was established.
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Affiliation(s)
- Hong-Ming Huang
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Xu-Yan Wu
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Bo-Rong Leng
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Yi-Long Zhu
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Xin-Chao Meng
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Yu Hong
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - De-Cai Wang
- School of Pharmaceutical
- Nanjing Tech University
- Nanjing
- P. R. China
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40
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Shi H, Wang L, Li SS, Liu Y, Xu L. Divergent syntheses of spirooxindoles from oxindole-embedded four-membered synthon via cycloaddition reactions. Org Chem Front 2020. [DOI: 10.1039/d0qo00038h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The construction of five and six membered heterocycle fused spirooxindoles was achieved via the [4 + 1] and formal [4 + 2] cycloadditions between our rationally designed four-membered synthons and pyridinium methylides and α-bromoacetophenones, respectively.
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Affiliation(s)
- Hongjin Shi
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
| | - Liang Wang
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
- College of Chemistry and Molecular Engineering
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
- College of Chemistry and Molecular Engineering
| | - Yongjun Liu
- College of Chemistry and Molecular Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- P. R. China
| | - Lubin Xu
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
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41
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Zhang TS, Yang L, Cai PJ, Tu SJ, Jiang B. Silver-Catalyzed Nitration/Annulation of α-Alkynyl Arylols toward 3-Nitrated Benzofurans. Chem Asian J 2019; 14:4383-4388. [PMID: 31777196 DOI: 10.1002/asia.201901400] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 11/03/2019] [Indexed: 12/28/2022]
Abstract
A silver-catalyzed nitration/annulation of α-alkynyl arylols is reported by using tert-butyl nitrite (TBN) as a NO2 radical precursor, from which a set of 3-nitrated benzofurans were synthesized with moderate to good yields. This transformation initiated by an in situ generated NO2 radical proceeds efficiently under mild and neutral redox conditions, which provides a new pathway toward the 3-nitrobenzofuran framework via catalytic difunctionalization of internal alkynes.
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Affiliation(s)
- Tian-Shu Zhang
- School of Chemical Engineering&Technology, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Lei Yang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Pei-Jun Cai
- School of Chemical Engineering&Technology, China University of Mining and Technology, Xuzhou, 221116, P. R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, P. R. China
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42
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Peng L, Li K, Xie C, Li S, Xu D, Qin W, Yan H. Organocatalytic Asymmetric Annulation of
ortho
‐Alkynylanilines: Synthesis of Axially Chiral Naphthyl‐C2‐indoles. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908961] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Lei Peng
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Kai Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Chuandong Xie
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Shan Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Da Xu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
- Key Laboratory of Biorheological Science and TechnologyMinistry of EducationCollege of BioengineeringChongqing University Chongqing 400044 China
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43
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Peng L, Li K, Xie C, Li S, Xu D, Qin W, Yan H. Organocatalytic Asymmetric Annulation of
ortho
‐Alkynylanilines: Synthesis of Axially Chiral Naphthyl‐C2‐indoles. Angew Chem Int Ed Engl 2019; 58:17199-17204. [DOI: 10.1002/anie.201908961] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/27/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Lei Peng
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Kai Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Chuandong Xie
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Shan Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Da Xu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug ResearchChemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
- Key Laboratory of Biorheological Science and TechnologyMinistry of EducationCollege of BioengineeringChongqing University Chongqing 400044 China
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44
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Abe M, Jean A, Blanchet J, Rouden J, Maddaluno J, De Paolis M. H-bonding vs Protonation of Alkynes in Regioselective Hydroamination Reactions: A Glimpse into the Reactivity of Arylogous Ynolethers and Ynamines. J Org Chem 2019; 84:15448-15475. [PMID: 31671943 DOI: 10.1021/acs.joc.9b02471] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this paper is described the competition and transition between hydrogen bonding and protonation of alkynes connected, on one side, to various aromatic rings and to chiral amino ester appendages on the other side. While the first mode of activation induced the cyclization into pyrrolidines, the protonation of the alkyne led preferentially to tetrahydropyridines due to the higher level of the highest occupied molecular orbital (HOMO) of the considered arylogous ynolethers and ynamines. The transition between H-bonding and protonation was observed with the alkyne substituted with 2-methoxyphenyl, for which the cyclization delivered either five- or six-membered rings depending on the temperature of the experiment. From there, the cyclization of dialkoxy- and trialkoxyphenyl-substituted alkynes into six-membered rings, i.e., tetrahydropyridines, was developed. When next applied to alkynylindoles, the same pattern of cyclization provided six-membered rings as an illustration of the reactivity of arylogous ynamines. Thanks to the high reactivity of the intermediate cationic species, weak nucleophiles such as NH-oxazolidinone participated efficiently in the hydroamination reaction of alkynylindoles. Pyrrolidines, tetrahydropyridines, and piperidines decorated with various aromatics and substituents were thus prepared in enantio- and stereoselective manner. Capitalizing on the enamine moiety of the azaheterocycles, the molecular diversity was extended through stereoselective oxidation and ring contraction processes.
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Affiliation(s)
- Masahiro Abe
- Normandie Université, UNIROUEN, INSA de Rouen, CNRS, Laboratoire COBRA (UMR 6014 & FR 3038) , 76000 Rouen , France
| | - Alexandre Jean
- Normandie Université, UNIROUEN, INSA de Rouen, CNRS, Laboratoire COBRA (UMR 6014 & FR 3038) , 76000 Rouen , France.,Normandie Université, ENSICAEN, CNRS, Laboratoire LCMT (UMR 6507 & FR 3038) , 14000 Caen , France
| | - Jérôme Blanchet
- Normandie Université, ENSICAEN, CNRS, Laboratoire LCMT (UMR 6507 & FR 3038) , 14000 Caen , France
| | - Jacques Rouden
- Normandie Université, ENSICAEN, CNRS, Laboratoire LCMT (UMR 6507 & FR 3038) , 14000 Caen , France
| | - Jacques Maddaluno
- Normandie Université, UNIROUEN, INSA de Rouen, CNRS, Laboratoire COBRA (UMR 6014 & FR 3038) , 76000 Rouen , France
| | - Michaël De Paolis
- Normandie Université, UNIROUEN, INSA de Rouen, CNRS, Laboratoire COBRA (UMR 6014 & FR 3038) , 76000 Rouen , France
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45
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Jia S, Li S, Liu Y, Qin W, Yan H. Enantioselective Control of Both Helical and Axial Stereogenic Elements though an Organocatalytic Approach. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909214] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Shiqi Jia
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Shan Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Yidong Liu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research CenterSchool of Pharmaceutical SciencesChongqing University Chongqing 401331 P. R. China
- Key Laboratory of Biorheological Science and TechnologyMinistry of Education, College of BioengineeringChongqing University Chongqing 400044 P. R. China
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46
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Jia S, Li S, Liu Y, Qin W, Yan H. Enantioselective Control of Both Helical and Axial Stereogenic Elements though an Organocatalytic Approach. Angew Chem Int Ed Engl 2019; 58:18496-18501. [PMID: 31608559 DOI: 10.1002/anie.201909214] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/08/2019] [Indexed: 12/22/2022]
Abstract
A highly diastereo- and enantio-selective method for the asymmetric synthesis of molecules containing helicenes and stereogenic axes was developed based on organocatalysis. Various compounds bearing both helical and axial stereogenic elements were obtained in excellent enantioselectivities. The mechanism study revealed that the reaction proceeded through two stages: 1) The first cyclization produces a reaction intermediate containing a stereogenic axis. 2) The dynamic kinetic resolution of helix reaction intermediate following with cyclization generates a helix and another stereogenic axis.
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Affiliation(s)
- Shiqi Jia
- 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
| | - Shan 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
| | - Yidong 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
| | - Wenling Qin
- 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.,Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing, 400044, P. R. China
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47
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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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48
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Ji CL, Hao WJ, Zhang J, Geng FZ, Xu T, Tu SJ, Jiang B. Catalytic Three-Component Synthesis of Functionalized Naphtho[2,1-b]oxecines via a Double Bond Cleavage–Rearrangement Cascade. Org Lett 2019; 21:6494-6498. [DOI: 10.1021/acs.orglett.9b02367] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Cheng-Long Ji
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Jie Zhang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Fang-Zhou Geng
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Ting Xu
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
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49
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Ukis R, Schneider C. Brønsted Acid-Catalyzed, Diastereo- and Enantioselective, Intramolecular Oxa-Diels-Alder Reaction of ortho-Quinone Methides and Unactivated Dienophiles. J Org Chem 2019; 84:7175-7188. [PMID: 31117571 DOI: 10.1021/acs.joc.9b00860] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereoselective, phosphoric acid-catalyzed synthesis of dihydrochromenochromenes has been developed using transient ortho-quinone methides ( o-QMs). Three contiguous stereogenic centers were formed with excellent yields, partially as single diastereomers and with moderate to excellent enantioselectivity. This intramolecular hetero-Diels-Alder reaction features unactivated dienophiles and o-QM precursors tethered by a simple phenoxy linker and furnishes cycloadducts with a prominent structural motif found in many natural products. Through an appropriate choice of dienophile configuration and backbone substitution either exo- or endo-stereoisomers were formed selectively with up to a 96:04 enantiomeric ratio.
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Affiliation(s)
- Rostyslav Ukis
- Institute of Organic Chemistry , University of Leipzig , Johannisallee 29 , 04103 Leipzig , Germany
| | - Christoph Schneider
- Institute of Organic Chemistry , University of Leipzig , Johannisallee 29 , 04103 Leipzig , Germany
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50
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Wu F, Zhu S. A Strategy To Obtain o-Naphthoquinone Methides: Ag(I)-Catalyzed Cyclization of Enynones for the Synthesis of Benzo[ h]chromanes and Naphthopyryliums. Org Lett 2019; 21:1488-1492. [PMID: 30789279 DOI: 10.1021/acs.orglett.9b00281] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new strategy to obtain o-NQM intermediates through a ring-formation strategy by Ag(I)-catalyzed cyclization of 2-alkenylphenyl alkynyl ketones and its [4 + 2] annulations with styrenes has been developed. This reaction features high efficiency, mild reaction conditions, as well as flexible substitutions and atom economy. The obtained benzo[ h]chromane products were further oxidized to naphthopyryliums, which displayed tunable photophysical properties.
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Affiliation(s)
- Feng Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , P.R. China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , P.R. China.,State Key Laboratory of Elemento-Organic Chemistry , Nankai University , Tianjin 300071 , P.R. China
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