1
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Li SD, Xiong BQ, Tang KW, Zhong LJ, Liu Y. Synthesis of Acylation Polycyclic Derivatives via Regioselective Acylation/Cyclization of 1,7-Dienes with Acyl Oxime Esters. J Org Chem 2024; 89:11233-11243. [PMID: 39052929 DOI: 10.1021/acs.joc.4c00904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
A visible-light-induced radical cascade regioselective acylation/cyclization of 1,7-dienes with acyl oxime esters for the preparation of acylation polycyclic compounds via NCR-mediated C-C σ-bond cleavage is established. The transformation involves the cleavage of the C-C σ-bond in acyl oxime esters and selective addition of the electron neutral C═C bonds in 1,7-dienes for the synthesis of acyl polycyclic quinolinone derivatives, not the traditional seven-membered ring products. The strategy offers several advantages, including broad substrate tolerance, no need for bases, hyperstoichiometric radical initiators, and other auxiliaries.
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Affiliation(s)
- Shun-Dan Li
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
| | - Bi-Quan Xiong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
| | - Long-Jin Zhong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China
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2
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Zhu M, Gao YJ, Huang XL, Li M, Zheng C, You SL. Photo-induced intramolecular dearomative [5 + 4] cycloaddition of arenes for the construction of highly strained medium-sized-rings. Nat Commun 2024; 15:2462. [PMID: 38503749 PMCID: PMC10951311 DOI: 10.1038/s41467-024-46647-4] [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: 11/27/2023] [Accepted: 03/05/2024] [Indexed: 03/21/2024] Open
Abstract
Medium-sized-ring compounds have been recognized as challenging synthetic targets in organic chemistry. Especially, the difficulty of synthesis will be augmented if an E-olefin moiety is embedded. Recently, photo-induced dearomative cycloaddition reactions that proceed via energy transfer mechanism have witnessed significant developments and provided powerful methods for the organic transformations that are not easily realized under thermal conditions. Herein, we report an intramolecular dearomative [5 + 4] cycloaddition of naphthalene-derived vinylcyclopropanes under visible-light irradiation and a proper triplet photosensitizer. The reaction affords dearomatized polycyclic molecules possessing a nine-membered-ring with an E-olefin moiety in good yields (up to 86%) and stereoselectivity (up to 8.8/1 E/Z). Detailed computational studies reveal the origin behind the favorable formation of the thermodynamically less stable isomers. Diverse derivations of the dearomatized products have also been demonstrated.
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Affiliation(s)
- Min Zhu
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China
- School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai, China
| | - Yuan-Jun Gao
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China
| | - Xu-Lun Huang
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China
- School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai, China
| | - Muzi Li
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China
| | - Chao Zheng
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China.
| | - Shu-Li You
- New Cornerstone Science Laboratory, State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, China.
- School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai, China.
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3
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Li S, Jiao H, Shu XZ, Wu L. Zirconium and hafnium catalyzed C-C single bond hydroboration. Nat Commun 2024; 15:1846. [PMID: 38418499 PMCID: PMC10902336 DOI: 10.1038/s41467-024-45697-y] [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: 04/25/2023] [Accepted: 02/01/2024] [Indexed: 03/01/2024] Open
Abstract
Selective cleavage and subsequent functionalization of C-C single bonds present a fundamental challenge in synthetic organic chemistry. Traditionally, the activation of C-C single bonds has been achieved using stoichiometric transition-metal complexes. Recently, examples of catalytic processes were developed in which use is made of precious metals. However, the use of inexpensive and Earth-abundant group IV metals for catalytic C-C single-bond cleavage is largely underdeveloped. Herein, the zirconium-catalyzed C-C single-bond cleavage and subsequent hydroboration reactions is realized using Cp2ZrCl2 as a catalytic system. A series of structures of various γ-boronated amines are readily obtained, which are otherwise difficult to obtain. Mechanistic studies disclose the formation of a N-ZrIV species, and then a β-carbon elimination route is responsible for C-C single bond activation. Besides zirconium, hafnium exhibits a similar performance for this transformation.
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Affiliation(s)
- Sida Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany.
| | - Xing-Zhong Shu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, PR China
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou, 730000, PR China.
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, PR China.
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4
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Ji MM, Liu PR, Yan JD, He YY, Li H, Ma AJ, Peng JB. Ruthenium-Catalyzed Carbonylation of α-Aminoaryl-Tethered Alkylidenecyclopropanes: Synthesis of Eight-Membered Benzolactams. Org Lett 2024; 26:231-235. [PMID: 38165133 DOI: 10.1021/acs.orglett.3c03913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
The synthesis of medium-sized lactams is a great challenge because of the unfavorable transannular interactions and entropic barriers in the transition state. We have developed a ruthenium-catalyzed carbonylation of α-aminoaryl-tethered alkylidenecyclopropanes (ACPs) that allows for the efficient preparation of valuable eight-membered benzolactams under ligand-free conditions. The amino group served a dual role of both directing group and nucleophile to facilitate the metallacycle formation and the carbonylation.
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Affiliation(s)
- Miao-Miao Ji
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Peng-Rui Liu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Jun-Dong Yan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Yong-Yu He
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Hongguang Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
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5
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Yue Y, Song Y, Zhao S, Zhang C, Zhu C, Feng C. Electrooxidative Fluorofunctionalization of Arylcyclopropanes. Org Lett 2023; 25:7385-7389. [PMID: 37769018 DOI: 10.1021/acs.orglett.3c02843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
The work herein demonstrates the viability of an electrochemical oxidative protocol for the expedient realization of 1,3-fluorofunctionalization of arylcyclopropanes under catalyst- and oxidant-free conditions. Given the relatively low nucleophilicity of fluoride ion, the counterintuitive outcome that the ring-opening is initiated by nucleophilic fluorination is rationalized by invoking tight ion pair between aryl radical cation and BF4- counterion. By integrating alcohols, acids, and N-heterocycles as the terminating nucleophiles, straightforward 1,3-fluorooxygenation and 1,3-fluoroamination are smoothly achieved.
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Affiliation(s)
- Yanni Yue
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering of Materials Science, Soochow University, Suzhou 215123, China
| | - Yang Song
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Shuaishuai Zhao
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Chi Zhang
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Chuan Zhu
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Chao Feng
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis (IAS), State Key Laboratory of Material-Oriented Chemical Engineering, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
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6
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Mao HL, Wang YX, Wang X, Wang HY, Hao WJ, Jiang B. Pd-Catalyzed Asymmetric Annulative Dearomatization of Phenols for Regio- and Enantioselective Synthesis of Spirocyclohexadienones. Org Lett 2023; 25:5963-5968. [PMID: 37540111 DOI: 10.1021/acs.orglett.3c02051] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
A palladium-catalyzed asymmetric annulative dearomatization of phenols with butene dicarbonate is reported, enabling twofold decarboxylative allylation to regioselectively produce a range of spirocyclohexadienones with 29-95% yields and 74-99% ee. A catalytic dearomative formal [4 + 2] cyclization of 1,1'-biphenyl-2,4'-diols delivered spiro[chromane-4,1'-cyclohexane]-2',5'-dien-4'-ones with high enantioselectivity, whereas enantioenriched spiro[cyclohexane-1,4'-quinoline]-2,5-dien-4-ones were generated starting from 2'-amino-[1,1'-biphenyl]-4-ols as 1,4-dinucleophiles.
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Affiliation(s)
- Hui-Lin Mao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Yu-Xin Wang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Xue Wang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Hai-Ying Wang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, China
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7
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Mikan CP, Matthews A, Harris D, McIvor CE, Waddell PG, Sims MT, Knowles JP. Stereoselective two-carbon ring expansion of allylic amines via electronic control of palladium-promoted equilibria. Chem Sci 2023; 14:6992-6996. [PMID: 37389260 PMCID: PMC10306103 DOI: 10.1039/d3sc02303f] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 06/06/2023] [Indexed: 07/01/2023] Open
Abstract
General methodologies enabling the two-carbon homologation of pyrrolidine and piperidine systems have yet to be developed. Herein we report that palladium-catalysed allylic amine rearrangements enable efficient two-carbon ring expansion of 2-alkenyl pyrrolidine and piperidines to their azepane and azocane counterparts. Conditions are mild, tolerant of a range of functional groups and the process can occur with high enantioretention. The products formed undergo a range of orthogonal transformations, making them ideal scaffolds for the creation of compound libraries.
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Affiliation(s)
- Charles P Mikan
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
| | - Aidan Matthews
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
| | - Daniel Harris
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
| | - Charlotte E McIvor
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
| | - Paul G Waddell
- School of Natural and Environmental Sciences, Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Mark T Sims
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
| | - Jonathan P Knowles
- Department of Applied Sciences, Northumbria University Newcastle upon Tyne NE1 8ST UK
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8
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Bower JF, Sokolova OO, Dalling AG. C–C Bond Activations of Minimally Activated Cyclopropanes. Synlett 2022. [DOI: 10.1055/s-0042-1753177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
AbstractCatalytic processes involving oxidative addition of a C–C bond to a transition metal allow the atom economical assembly of complex scaffolds. The focus of this Account is on C–C bond activation-based methodologies that employ minimally activated cyclopropanes.
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9
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Sokolova OO, Bower JF. An endo-Directing-Group Strategy Unlocks Enantioselective (3+1+2) Carbonylative Cycloadditions of Aminocyclopropanes. Angew Chem Int Ed Engl 2022; 61:e202205007. [PMID: 35611866 PMCID: PMC9401022 DOI: 10.1002/anie.202205007] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Indexed: 12/18/2022]
Abstract
An endo-directing group strategy enables enantioselective (3+1+2) cycloadditions that are triggered by carbonylative C-C bond activation of cyclopropanes. These processes are rare examples of cycloadditions where C-C bond oxidative addition is enantiodetermining, and the first where this is achieved within the context of a multicomponent (higher order) reaction design.
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Affiliation(s)
- Olga O Sokolova
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
| | - John F Bower
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK
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10
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Calow ADJ, Dailler D, Bower JF. Carbonylative N-Heterocyclization via Nitrogen-Directed C-C Bond Activation of Nonactivated Cyclopropanes. J Am Chem Soc 2022; 144:11069-11074. [PMID: 35715228 PMCID: PMC9248011 DOI: 10.1021/jacs.2c02921] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
![]()
Under Rh-catalyzed
conditions, secondary amines and anilines function
as directing groups to facilitate regioselective C–C bond activation
of nonactivated cyclopropanes. The resulting amino-stabilized rhodacycles
undergo carbonylative C–N bond formation en route to challenging
seven- and eight-membered lactams. The processes represent rare examples
where C–C bond oxidative addition of nonactivated cyclopropanes
is exploited in reaction design.
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Affiliation(s)
- Adam D J Calow
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom
| | - David Dailler
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, United Kingdom
| | - John F Bower
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, United Kingdom
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11
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Sokolova OO, Bower J. An endo‐Directing‐Group Strategy Unlocks Enantioselective (3+1+2) Carbonylative Cycloadditions of Aminocyclopropanes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205007] [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)
| | - John Bower
- University of Liverpool School of Chemistry L69 3BX Liverpool UNITED KINGDOM
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12
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Lee JY, Varshnaya RK, Yoo EJ. Synthesis of Chiral Diazocine Derivatives via a Copper-Catalyzed Dearomative [5+3] Cycloaddition. Org Lett 2022; 24:3731-3735. [PMID: 35549493 DOI: 10.1021/acs.orglett.2c01389] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Copper-catalyzed [5+3] cycloaddition of N-aromatic zwitterions and enol diazoacetates produced enantio-enriched diazocine derivatives. A sterically encumbered BOX ligand and NaBArF additive played significant roles in driving the overall catalytic process via the unfavorable dearomatization to construct the desired eight-membered heterocyclic compounds. The induced stereoselectivity was preserved after further modifications of the skeleton, which demonstrates the potential applications of the developed asymmetric catalysis.
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Affiliation(s)
- Ju Young Lee
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Rohit Kumar Varshnaya
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Eun Jeong Yoo
- Department of Applied Chemistry, Kyung Hee University, Yongin 17104, Republic of Korea
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13
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Ding L, Song H, Zheng C, You SL. Enantioselective Synthesis of Medium-Sized-Ring Lactones via Iridium-Catalyzed Z-Retentive Asymmetric Allylic Substitution Reaction. J Am Chem Soc 2022; 144:4770-4775. [PMID: 35266702 DOI: 10.1021/jacs.2c01103] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Medium-sized rings are important structural units, but their synthesis, especially in a highly enantioselective manner, has been a great challenge. Herein we report an enantioselective synthesis of medium-sized-ring lactones by an iridium-catalyzed Z-retentive asymmetric allylic substitution reaction. The reaction features mild conditions and a broad substrate scope. Various eight- to 11-membered-ring lactones can be afforded in moderate to excellent yields (up to 88%) and excellent enantioselectivity (up to 99% ee). The utilization of both Z-allyl precursors and an Ir catalyst is critical for the medium-sized-ring formation.
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Affiliation(s)
- Lu Ding
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China.,School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Shanghai 201210, China
| | - Hao Song
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Chao Zheng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Shu-Li You
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China.,School of Physical Science and Technology, ShanghaiTech University, 393 Middle Huaxia Road, Shanghai 201210, China
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14
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Leverenz M, Masson G, Pardo DG, Cossy J. Synthesis of Azocanes from Piperidines via an Azetidinium Intermediate. Chemistry 2021; 27:16325-16328. [PMID: 34643301 DOI: 10.1002/chem.202102739] [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: 07/28/2021] [Indexed: 11/11/2022]
Abstract
α-Trifluoromethyl azocanes are accessible from 2-(trifluoropropan-2-ol) piperidines by metal-free ring-expansion involving a bicyclic azetidinium intermediate. The opening of the azetidinium intermediate was achieved by various nucleophiles (amines, alcoholates, carboxylates, phosphonates, halides and pseudo-halides) with an excellent regio- diastereo- and enantioselectivity and in good yields. The relative configuration of the piperidines and azocanes were assigned and the deprotected azocanes offer opportunities for further derivatization.
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Affiliation(s)
- Malte Leverenz
- Molecular, Macromolecular Chemistry and Materials, UMR 7167 ESPCI Paris, CNRS, PSL University, 10 rue Vauquelin, 75231, Paris Cedex 05, France
| | - Guillaume Masson
- Molecular, Macromolecular Chemistry and Materials, UMR 7167 ESPCI Paris, CNRS, PSL University, 10 rue Vauquelin, 75231, Paris Cedex 05, France
| | - Domingo Gomez Pardo
- Molecular, Macromolecular Chemistry and Materials, UMR 7167 ESPCI Paris, CNRS, PSL University, 10 rue Vauquelin, 75231, Paris Cedex 05, France
| | - Janine Cossy
- Molecular, Macromolecular Chemistry and Materials, UMR 7167 ESPCI Paris, CNRS, PSL University, 10 rue Vauquelin, 75231, Paris Cedex 05, France
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15
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Eymery M, Tran-Nguyen VK, Boumendjel A. Diversity-Oriented Synthesis: Amino Acetophenones as Building Blocks for the Synthesis of Natural Product Analogs. Pharmaceuticals (Basel) 2021; 14:1127. [PMID: 34832909 PMCID: PMC8619038 DOI: 10.3390/ph14111127] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/30/2021] [Accepted: 11/03/2021] [Indexed: 11/16/2022] Open
Abstract
Diversity-Oriented Synthesis (DOS) represents a strategy to obtain molecule libraries with diverse structural features starting from one common compound in limited steps of synthesis. During the last two decades, DOS has become an unmissable strategy in organic synthesis and is fully integrated in various drug discovery processes. On the other hand, natural products with multiple relevant pharmacological properties have been extensively investigated as scaffolds for ligand-based drug design. In this article, we report the amino dimethoxyacetophenones that can be easily synthesized and scaled up from the commercially available 3,5-dimethoxyaniline as valuable starting blocks for the DOS of natural product analogs. More focus is placed on the synthesis of analogs of flavones, coumarins, azocanes, chalcones, and aurones, which are frequently studied as lead compounds in drug discovery.
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Affiliation(s)
- Mathias Eymery
- Université Grenoble Alpes, INSERM, LRB, 38000 Grenoble, France;
- EMBL Grenoble, 71 Avenue des Martyrs, CS 90181, 38042 Grenoble, France
| | - Viet-Khoa Tran-Nguyen
- Laboratoire d’Innovation Thérapeutique, Université de Strasbourg, 67400 Illkirch, France;
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16
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Catalytic hydrative cyclization of aldehyde-ynamides with water for synthesis of medium-sized lactams. Sci China Chem 2021. [DOI: 10.1007/s11426-021-1069-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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17
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Wang F, Zhou Q, Zhang X, Fan X. Direct α-Alkenylation of Cyclic Amines with Maleimides through Fe(III)-Catalyzed C(sp 3)-H/C(sp 2)-H Cross Dehydrogenative Coupling. J Org Chem 2021; 86:11708-11722. [PMID: 34355565 DOI: 10.1021/acs.joc.1c01198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Presented herein is a novel and efficient α-C(sp3)-H alkenylation of cyclic amines with maleimides. Mechanistically, this C(sp3)-H/C(sp2)-H cross dehydrogenative coupling (CDC) reaction involves a cascade procedure including oxidative α-amino radical formation from the cyclic amine substrate and nucleophilic addition of the in situ formed α-amino radical onto the electron-deficient carbon-carbon double bond of maleimide followed by oxidation and β-elimination. Notably, this direct α-functionalization provides an effective alternative to the conventional ionic reaction mode, in which an imine or iminium intermediate is formed to react with electron-rich coupling partners other than electron-deficient ones. In general, this method features readily available and structurally diverse substrates, a green and economical catalyst, a unique reaction pathway, mild reaction conditions, high efficiency, and excellent atom economy. This new reaction enriches the application of Fe(III)-catalyzed C(sp3)-H activation and functionalization.
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Affiliation(s)
- Fang Wang
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.,Advanced Research Institute and Department of Chemistry, Taizhou University, Taizhou, Zhejiang 318000, China
| | - Qianting Zhou
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinying Zhang
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuesen Fan
- NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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18
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Total Synthesis and Anti-Inflammatory Bioactivity of (-)-Majusculoic Acid and Its Derivatives. Mar Drugs 2021; 19:md19060288. [PMID: 34063984 PMCID: PMC8223986 DOI: 10.3390/md19060288] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 05/15/2021] [Accepted: 05/18/2021] [Indexed: 12/24/2022] Open
Abstract
The first total synthesis of marine natural product, (−)-majusculoic acid (1) and its seven analogs (9–15), was accomplished in three to ten steps with a yield of 3% to 28%. The strategy featured the application of the conformational controlled establishment of the trans-cyclopropane and stereochemical controlled bromo-olefination or olefination by Horner–Wadsworth–Emmons (HWE) reaction. The potential anti-inflammatory activity of the eight compounds (1 and 9–15) was evaluated by determining the nitric oxide (NO) production in the lipopolysaccharide (LPS)-induced mouse macrophages RAW264.7. (−)-Majusculoic acid (1), methyl majusculoate (9), and (1R,2R)-2-((3E,5Z)-6-bromonona-3,5-dien-1-yl)cyclopropane-1-carboxylic acid (12) showed significant effect with inhibition rates of 33.68%, 35.75%, and 43.01%, respectively. Moreover, they did not show cytotoxicity against RAW264.7 cells, indicating that they might be potential anti-inflammatory agents.
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19
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Ouyang W, Rao J, Li Y, Liu X, Huo Y, Chen Q, Li X. Recent Achievements in the Rhodium‐Catalyzed Concise Construction of Medium N‐Heterocycles, Azepines and Azocines. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001040] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Wensen Ouyang
- School of Chemical Engineering and Light Industry Guangdong University of Technology No. 100 Waihuan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 People's Republic of China
| | - Jianhang Rao
- School of Chemical Engineering and Light Industry Guangdong University of Technology No. 100 Waihuan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 People's Republic of China
| | - Yibiao Li
- School of Biotechnology and Health Science Wuyi University Jiangmen 529020 People's Republic of China
| | - Xiaohang Liu
- BASF Advanced Chemicals Co., Ltd. No. 300, Jiangxinsha Road 200137 Shanghai People's Republic of China
| | - Yanping Huo
- School of Chemical Engineering and Light Industry Guangdong University of Technology No. 100 Waihuan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 People's Republic of China
| | - Qian Chen
- School of Chemical Engineering and Light Industry Guangdong University of Technology No. 100 Waihuan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 People's Republic of China
| | - Xianwei Li
- School of Chemical Engineering and Light Industry Guangdong University of Technology No. 100 Waihuan Xi Road Guangzhou Higher Education Mega Center Guangzhou 510006 People's Republic of China
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20
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Wang M, Waser J. Oxidative Fluorination of Cyclopropylamides through Organic Photoredox Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ming‐Ming Wang
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de LausanneEPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
| | - Jérôme Waser
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de LausanneEPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
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21
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Wang M, Waser J. Oxidative Fluorination of Cyclopropylamides through Organic Photoredox Catalysis. Angew Chem Int Ed Engl 2020; 59:16420-16424. [DOI: 10.1002/anie.202007864] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Ming‐Ming Wang
- Laboratory of Catalysis and Organic Synthesis Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
| | - Jérôme Waser
- Laboratory of Catalysis and Organic Synthesis Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
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22
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Sokolova OO, Bower JF. Selective Carbon–Carbon Bond Cleavage of Cyclopropylamine Derivatives. Chem Rev 2020; 121:80-109. [DOI: 10.1021/acs.chemrev.0c00166] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Olga O. Sokolova
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - John F. Bower
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, United Kingdom
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23
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Nanda T, Ravikumar PC. A Palladium-Catalyzed Cascade C–C Activation of Cyclopropenone and Carbonylative Amination: Easy Access to Highly Functionalized Maleimide Derivatives. Org Lett 2020; 22:1368-1374. [DOI: 10.1021/acs.orglett.9b04656] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Tanmayee Nanda
- National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, HBNI, Jatani, Odisha 752050, India
| | - P. C. Ravikumar
- National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, HBNI, Jatani, Odisha 752050, India
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24
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Wang GW, Boyd O, Young TA, Bertrand SM, Bower JF. Rhodacyclopentanones as Linchpins for the Atom Economical Assembly of Diverse Polyheterocycles. J Am Chem Soc 2020; 142:1740-1745. [DOI: 10.1021/jacs.9b12421] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Gang-Wei Wang
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Olivia Boyd
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Tom A. Young
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Sophie M. Bertrand
- GlaxoSmithKline R&D, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, United Kingdom
| | - John F. Bower
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
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25
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Asymmetric Remote Addition Reactions of Heterocycle-Based Dearomative Dienamine or Trienamine Species to 1-Azadienes: Application to Construct Chiral Azocanes and Azecanes. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901848] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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26
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Boyd O, Wang G, Sokolova OO, Calow ADJ, Bertrand SM, Bower JF. Modular Access to Eight‐Membered N‐Heterocycles by Directed Carbonylative C−C Bond Activation of Aminocyclopropanes. Angew Chem Int Ed Engl 2019; 58:18844-18848. [DOI: 10.1002/anie.201910276] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 09/26/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Olivia Boyd
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
| | - Gang‐Wei Wang
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
| | | | | | - Sophie M. Bertrand
- GlaxoSmithKline R&DMedicines Research Centre Gunnels Wood Road Stevenage Hertfordshire SG1 2NY UK
| | - John F. Bower
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
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27
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Dierks A, Tönjes J, Schmidtmann M, Christoffers J. Synthesis of Benzo[b]azocin-2-ones by Aryl Amination and Ring-Expansion of α-(Iodophenyl)-β-oxoesters. Chemistry 2019; 25:14912-14920. [PMID: 31433088 PMCID: PMC6899745 DOI: 10.1002/chem.201903139] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Indexed: 01/16/2023]
Abstract
Transformation of β-oxoesters with PhI(OCOCF3 )2 leads to α-(ortho-iodophenyl)-β-oxoesters. These materials are the starting point for the synthesis of 6-carboxybenzo[b]azocin-2-ones by a sequence of aryl amination and ring transformation. This reaction sequence starts with copper-catalyzed formation of N-alkyl anilines from the iodoarenes and primary amines in the presence of K3 PO4 as stoichiometric base. The intermediate products underwent ring transformation by addition of the nitrogen into the carbonyl group of the cycloalkanone, furnishing benzo-annulated eight-membered ring lactams. Under the same reaction conditions, the cyclohexanone and cycloheptanone derivatives gave no aminated products, but ring-transformed to benzofuran derivatives. The title compounds of this investigation contain two points for further diversification (the lactam nitrogen and the carboxylate function), thus, the suitability of this compound class as a scaffold was proven by appropriate functionalizations. The first series of derivatizations of the scaffold was initiated by hydrogenolytic debenzylation of N-benzyl derivative to provide the NH-congener, which could be deprotonated with LDA and alkylated at nitrogen to give further examples of this compound class. Secondly, the ester function was submitted to saponification and the resulting carboxylic acid could be amidated using HATU as coupling reagent to furnish different amides.
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Affiliation(s)
- Anna Dierks
- Institut für ChemieCarl von Ossietzky Universität Oldenburg26111OldenburgGermany
| | - Jan Tönjes
- Institut für ChemieCarl von Ossietzky Universität Oldenburg26111OldenburgGermany
| | - Marc Schmidtmann
- Institut für ChemieCarl von Ossietzky Universität Oldenburg26111OldenburgGermany
| | - Jens Christoffers
- Institut für ChemieCarl von Ossietzky Universität Oldenburg26111OldenburgGermany
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28
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Boyd O, Wang G, Sokolova OO, Calow ADJ, Bertrand SM, Bower JF. Modular Access to Eight‐Membered N‐Heterocycles by Directed Carbonylative C−C Bond Activation of Aminocyclopropanes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201910276] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Olivia Boyd
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
| | - Gang‐Wei Wang
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
| | | | | | - Sophie M. Bertrand
- GlaxoSmithKline R&DMedicines Research Centre Gunnels Wood Road Stevenage Hertfordshire SG1 2NY UK
| | - John F. Bower
- School of ChemistryUniversity of Bristol Bristol BS8 1TS UK
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29
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Liu J, Liu R, Wei Y, Shi M. Recent Developments in Cyclopropane Cycloaddition Reactions. TRENDS IN CHEMISTRY 2019. [DOI: 10.1016/j.trechm.2019.06.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Gharpure SJ, Nanda SK, Fartade DJ. Expeditious diastereoselective synthesis of medium ring heterocycle-fused chromenes via tandem 8/9-endo-dig and 8-exo-dig hydroalkoxylation-formal-[4 + 2] cycloaddition. Org Biomol Chem 2019; 17:8806-8810. [PMID: 31556431 DOI: 10.1039/c9ob02030f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first examples of highly diastereoselective tandem 8/9-endo-dig and 8-exo-dig hydroalkoxylation-formal-[4 + 2] cycloaddition are described for the synthesis of medium ring heterocycle-fused chromenes. TMS-alkynols preferred the exo-dig mode of hydroalkoxylation over the endo-dig mode leading to spiro-cyclic chromenes. The method could be used for the synthesis of linearly-fused ladder-like polyethers. A thia-heterocycle-fused chromene could be transformed into a complex bridged tricyclic ketal by a tandem carbene-insertion-[2,3]-sigmatropic shift.
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Affiliation(s)
- Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
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31
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Wang M, Waser J. 1,3‐Difunctionalization of Aminocyclopropanes via Dielectrophilic Intermediates. Angew Chem Int Ed Engl 2019; 58:13880-13884. [DOI: 10.1002/anie.201907060] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/17/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Ming‐Ming Wang
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
| | - Jérôme Waser
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
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32
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Wang M, Waser J. 1,3‐Difunctionalization of Aminocyclopropanes via Dielectrophilic Intermediates. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ming‐Ming Wang
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
| | - Jérôme Waser
- Laboratory of Catalysis and Organic SynthesisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306 1015 Lausanne Switzerland
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33
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Stereoselective synthesis of medium lactams enabled by metal-free hydroalkoxylation/stereospecific [1,3]-rearrangement. Nat Commun 2019; 10:3234. [PMID: 31324800 PMCID: PMC6642132 DOI: 10.1038/s41467-019-11245-2] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 07/02/2019] [Indexed: 12/23/2022] Open
Abstract
Rearrangement reactions have attracted considerable interest over the past decades due to their high bond-forming efficiency and atom economy in the construction of complex organic architectures. In contrast to the well-established [3,3]-rearrangement, [1,3] O-to-C rearrangement has been far less vigorously investigated, and stereospecific [1,3]-rearrangement is extremely rare. Here, we report a metal-free intramolecular hydroalkoxylation/[1,3]-rearrangement, leading to the practical and atom-economical assembly of various valuable medium-sized lactams with wide substrate scope and excellent diastereoselectivity. Moreover, such an asymmetric cascade cyclization has also been realized by chiral Brønsted acid-catalyzed kinetic resolution. In addition, biological tests reveal that some of these medium-sized lactams displayed their bioactivity as antitumor agents against melanoma cells, esophageal cancer cells and breast cancer cells. A mechanistic rationale for the reaction is further supported by control experiments and theoretical calculations. Stereospecific [1,3]-rearrangements are rarely reported method to efficiently build complex organic architectures. Here, the authors describe a metal-free intramolecular hydroalkoxylation/[1,3]-rearrangement sequence affording medium-sized lactams with wide scope, also in an asymmetric fashion.
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34
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Zhang YL, Guo RT, He JH, Wang XC. Catalytic Intermolecular Coupling of Rhodacyclopentanones with Alcohols Enabled by Dual Directing Strategy. Org Lett 2019; 21:4239-4244. [DOI: 10.1021/acs.orglett.9b01420] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ya-Lin Zhang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Rui-Ting Guo
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jia-Hao He
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Chen Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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35
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Tin(IV)-Porphyrin Tetracarbonyl Cobaltate: An Efficient Catalyst for the Carbonylation of Epoxides. Catalysts 2019. [DOI: 10.3390/catal9040311] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Cationic tin(IV) porphyrins with tetracarbonyl cobaltates were synthesized, exhibiting bifunctional catalytic reactivity. The Lewis acidic tin-porphyrin center activated epoxides; concurrently, cobalt carbonyl anions efficiently opened epoxides and delivered carbonyl moieties. Thus, a series of β-lactones with a high synthetic value were obtained. This catalytic system showed excellent efficiency exceeding a turnover number of one thousand with a broad substrate scope. In addition, the presented tin porphyrin-based catalyst exhibited exclusive chemoselectivity to terminal epoxides over internal ones. The selective carbonylation of di-epoxides demonstrated the usefulness of these catalysts in the synthesis of complex molecular structures.
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36
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Qiu Y, Scheremetjew A, Ackermann L. Electro-Oxidative C-C Alkenylation by Rhodium(III) Catalysis. J Am Chem Soc 2019; 141:2731-2738. [PMID: 30636408 DOI: 10.1021/jacs.8b13692] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Electrochemical C-C activations were accomplished by expedient oxidative rhodium(III) catalysis. Thus, oxidative C-C alkenylations proved viable with the aid of electricity, avoiding the use of toxic and/or expensive transition-metal oxidants. The chelation-assisted C-C functionalizations proceeded with ample scope and excellent levels of chemo- and position selectivities within an organometallic C-C activation manifold. Detailed mechanistic studies provided support for a kinetically relevant C-C scission, and a well-defined organometallic rhodium(III) complex was identified as a catalytically competent intermediate. The electrochemical C-C functionalization was devoid of additional electrolytes, could be conducted on a gram scale, and provided position-selective access to densely 1,2,3-substituted arenes, which are not viable by C-H activation.
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Affiliation(s)
- Youai Qiu
- Institut für Organische und Biomolekulare Chemie , Georg-August-Universität Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Alexej Scheremetjew
- Institut für Organische und Biomolekulare Chemie , Georg-August-Universität Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie , Georg-August-Universität Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
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37
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Wang D, Xue X, Houk KN, Shi Z. Mild Ring‐Opening 1,3‐Hydroborations of Non‐Activated Cyclopropanes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811036] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Di Wang
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
| | - Xiao‐Song Xue
- Department of Chemistry and BiochemistryUniversity of California Los Angeles CA 90095 USA
- State Key Laboratory of Elemento-organic ChemistryCollege of ChemistryNankai University Tianjin 300071 China
| | - Kendall N. Houk
- Department of Chemistry and BiochemistryUniversity of California Los Angeles CA 90095 USA
| | - Zhuangzhi Shi
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
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38
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Wang D, Xue X, Houk KN, Shi Z. Mild Ring‐Opening 1,3‐Hydroborations of Non‐Activated Cyclopropanes. Angew Chem Int Ed Engl 2018; 57:16861-16865. [DOI: 10.1002/anie.201811036] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Di Wang
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
| | - Xiao‐Song Xue
- Department of Chemistry and BiochemistryUniversity of California Los Angeles CA 90095 USA
- State Key Laboratory of Elemento-organic ChemistryCollege of ChemistryNankai University Tianjin 300071 China
| | - Kendall N. Houk
- Department of Chemistry and BiochemistryUniversity of California Los Angeles CA 90095 USA
| | - Zhuangzhi Shi
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
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39
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Dalling AG, Yamauchi T, McCreanor NG, Cox L, Bower JF. Carbonylative C−C Bond Activation of Electron-Poor Cyclopropanes: Rhodium-Catalyzed (3+1+2) Cycloadditions of Cyclopropylamides. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811460] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
| | | | | | - Lydia Cox
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - John F. Bower
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
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40
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Dalling AG, Yamauchi T, McCreanor NG, Cox L, Bower JF. Carbonylative C−C Bond Activation of Electron-Poor Cyclopropanes: Rhodium-Catalyzed (3+1+2) Cycloadditions of Cyclopropylamides. Angew Chem Int Ed Engl 2018; 58:221-225. [DOI: 10.1002/anie.201811460] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/02/2018] [Indexed: 12/12/2022]
Affiliation(s)
| | | | | | - Lydia Cox
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - John F. Bower
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
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41
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Zhou Y, Wei YL, Rodriguez J, Coquerel Y. Enantioselective Organocatalytic Four-Atom Ring Expansion of Cyclobutanones: Synthesis of Benzazocinones. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810184] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yirong Zhou
- Aix Marseille Université; CNRS; Centrale Marseille, ISM2; 13397 Marseille France
- Key Laboratory of Functional Small Organic Molecules Ministry of Education; Jiangxi Normal University; 330022 Nanchang China
| | - Yun-Long Wei
- Aix Marseille Université; CNRS; Centrale Marseille, ISM2; 13397 Marseille France
| | - Jean Rodriguez
- Aix Marseille Université; CNRS; Centrale Marseille, ISM2; 13397 Marseille France
| | - Yoann Coquerel
- Aix Marseille Université; CNRS; Centrale Marseille, ISM2; 13397 Marseille France
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42
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Zhou Y, Wei YL, Rodriguez J, Coquerel Y. Enantioselective Organocatalytic Four-Atom Ring Expansion of Cyclobutanones: Synthesis of Benzazocinones. Angew Chem Int Ed Engl 2018; 58:456-460. [PMID: 30398303 DOI: 10.1002/anie.201810184] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/15/2018] [Indexed: 01/04/2023]
Abstract
An enantioselective Michael addition- four-atom ring expansion cascade reaction involving cyclobutanones activated by a N-aryl secondary amide group and ortho-amino nitrostyrenes has been developed for the preparation of functionalized eight-membered benzolactams using bifunctional aminocatalysts. Taking advantage of the secondary amide activating group, the eight-membered cyclic products could be further rearranged into their six-membered isomers having a glutarimide core under base catalysis conditions without erosion of optical purity, featuring an overall ring expansion- ring contraction strategy.
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Affiliation(s)
- Yirong Zhou
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France.,Key Laboratory of Functional Small Organic Molecules Ministry of Education, Jiangxi Normal University, 330022, Nanchang, China
| | - Yun-Long Wei
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
| | - Jean Rodriguez
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
| | - Yoann Coquerel
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
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43
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Lv S, Xu Y, Li J. Computational study of Rh(I)-Catalyzed Cycloaddition–Fragmentation of N-cyclopropylacrylamides. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Xu WB, Li C, Wang J. RhI
-Catalyzed Carbonylative [3+1] Construction of Cyclobutenones via C−C σ-Bond Activation of Cyclopropenes. Chemistry 2018; 24:15786-15790. [DOI: 10.1002/chem.201804170] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Wen-Bin Xu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs; School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 P.R. China
| | - Changkun Li
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs; School of Chemistry and Chemical Engineering; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 P.R. China
| | - Jianbo Wang
- Key Laboratory of Bioorganic Chemistry and; Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
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45
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Liu CH, Li F, Yuan Y, Dou M, Yu ZX. RhI
-Catalyzed Intramolecular [3+2] Cycloaddition of 1-Allene-vinylcyclopropanes. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Cheng-Hang Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering, of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
| | - Feng Li
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering, of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
| | - Yuan Yuan
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering, of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
| | - Meng Dou
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering, of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
| | - Zhi-Xiang Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering, of Ministry of Education; College of Chemistry; Peking University; Beijing 100871 China
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46
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Derosa J, O'Duill ML, Holcomb M, Boulous MN, Patman RL, Wang F, Tran-Dubé M, McAlpine I, Engle KM. Copper-Catalyzed Chan-Lam Cyclopropylation of Phenols and Azaheterocycles. J Org Chem 2018; 83:3417-3425. [PMID: 29498847 DOI: 10.1021/acs.joc.7b03100] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Small molecules containing cyclopropane-heteroatom linkages are commonly needed in medicinal chemistry campaigns yet are problematic to prepare using existing methods. To address this issue, a scalable Chan-Lam cyclopropylation reaction using potassium cyclopropyl trifluoroborate has been developed. With phenol nucleophiles, the reaction effects O-cyclopropylation, whereas with 2-pyridones, 2-hydroxybenzimidazoles, and 2-aminopyridines the reaction brings about N-cyclopropylation. The transformation is catalyzed by Cu(OAc)2 and 1,10-phenanthroline and employs 1 atm of O2 as the terminal oxidant. This method is operationally convenient to perform and provides a simple, strategic disconnection toward the synthesis of cyclopropyl aryl ethers and cyclopropyl amine derivatives bearing an array of functional groups.
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Affiliation(s)
- Joseph Derosa
- Department of Chemistry , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Miriam L O'Duill
- Department of Chemistry , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Matthew Holcomb
- Department of Chemistry , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Mark N Boulous
- Department of Chemistry , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Ryan L Patman
- Pfizer Oncology Medicinal Chemistry , 10770 Science Center Drive , San Diego , California 92121 , United States
| | - Fen Wang
- Pfizer Oncology Medicinal Chemistry , 10770 Science Center Drive , San Diego , California 92121 , United States
| | - Michelle Tran-Dubé
- Pfizer Oncology Medicinal Chemistry , 10770 Science Center Drive , San Diego , California 92121 , United States
| | - Indrawan McAlpine
- Pfizer Oncology Medicinal Chemistry , 10770 Science Center Drive , San Diego , California 92121 , United States
| | - Keary M Engle
- Department of Chemistry , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
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47
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Deng L, Jin L, Dong G. Fused-Ring Formation by an Intramolecular "Cut-and-Sew" Reaction between Cyclobutanones and Alkynes. Angew Chem Int Ed Engl 2018; 57:2702-2706. [PMID: 29338109 PMCID: PMC5849476 DOI: 10.1002/anie.201712487] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 01/03/2017] [Indexed: 11/10/2022]
Abstract
The development of a catalytic intramolecular "cut-and-sew" transformation between cyclobutanones and alkynes to construct cyclohexenone-fused rings is described herein. The challenge arises from the need for selective coupling at the more sterically hindered proximal position, and can be addressed by using an electron-rich, but less bulky, phosphine ligand. The control experiment and 13 C-labelling study suggest that the reaction may start with cleavage of the less hindered distal C-C bond of cyclobutanones, followed by decarbonylation and CO reinsertion to enable Rh insertion at the more hindered proximal position.
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Affiliation(s)
- Lin Deng
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
| | - Likun Jin
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
- College of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, P. R. China
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
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48
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Wang GW, Bower JF. Modular Access to Azepines by Directed Carbonylative C-C Bond Activation of Aminocyclopropanes. J Am Chem Soc 2018; 140:2743-2747. [PMID: 29461050 PMCID: PMC5834216 DOI: 10.1021/jacs.7b13087] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
![]()
A modular
Rh-catalyzed entry to azepines is outlined. Under a CO
atmosphere, protecting group directed C–C bond activation of
aminocyclopropanes provides rhodacyclopentanones. These
intermediates are effective for intramolecular C–H metalation
of either an N-aryl or N-vinyl unit en route to azepine ring systems.
Thus, byproduct-free heterocyclizations are enabled by sequential
C–C activation and C–H functionalization steps.
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Affiliation(s)
- Gang-Wei Wang
- School of Chemistry, University of Bristol , Bristol, BS8 1TS, United Kingdom
| | - John F Bower
- School of Chemistry, University of Bristol , Bristol, BS8 1TS, United Kingdom
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49
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Sun T, Zhang Y, Qiu B, Wang Y, Qin Y, Dong G, Xu T. Rhodium(I)-Catalyzed Carboacylation/Aromatization Cascade Initiated by Regioselective C-C Activation of Benzocyclobutenones. Angew Chem Int Ed Engl 2018; 57:2859-2863. [PMID: 29360217 DOI: 10.1002/anie.201713179] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 01/19/2018] [Indexed: 12/21/2022]
Abstract
Described here is the first example of a rhodium-catalyzed carboacylation/aromatization cascade of a C=O bond by C-C activation. In this transformation, a reactive rhodaindanone complex is regioselectively generated and adds across a C=O bond with subsequent elimination, thus providing a unique strategy to access a multisubstituted benzofuran scaffold. A diverse range of benzofuran analogues were obtained in good yields. Mechanistic studies show a tricyclic lactone was a viable intermediate. Application of this methodology to the total synthesis of C13-deOH-viniferifuran and C13-deOH-diptoindonesin G was achieved.
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Affiliation(s)
- Tianwen Sun
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
| | - Yuna Zhang
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
| | - Bo Qiu
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
| | - Yafei Wang
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
| | - Yuting Qin
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
| | - Tao Xu
- Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266003, China
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50
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Sun T, Zhang Y, Qiu B, Wang Y, Qin Y, Dong G, Xu T. Rhodium(I)-Catalyzed Carboacylation/Aromatization Cascade Initiated by Regioselective C−C Activation of Benzocyclobutenones. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713179] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tianwen Sun
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
| | - Yuna Zhang
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
| | - Bo Qiu
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
| | - Yafei Wang
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
| | - Yuting Qin
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
| | - Guangbin Dong
- Department of Chemistry; University of Chicago; Chicago IL 60637 USA
| | - Tao Xu
- Key Laboratory of Marine Drugs Ministry of Education; School of Medicine and Pharmacy, Ocean University of China; Laboratory for Marine Drugs and Bioproducts; Qingdao National Laboratory for Marine Science and Technology; Qingdao 266003 China
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