1
|
Iftikhar R, Mazhar A, Iqbal MS, Khan FZ, Askary SH, Sibtain H. Ring forming transformations of ynamides via cycloaddition. RSC Adv 2023; 13:10715-10756. [PMID: 37025669 PMCID: PMC10072253 DOI: 10.1039/d3ra00139c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 03/29/2023] [Indexed: 04/07/2023] Open
Abstract
Ynamides are N-alkyne compounds bearing an electron withdrawing group at the nitrogen atom. They offer unique pathways for the construction of versatile building blocks owing to their exceptional balance between reactivity and stability. Recently several studies have been reported that explore and illustrate the synthetic potential of ynamides and ynamide-derived advanced intermediates in cycloadditions with different reaction partners to yield heterocyclic cycloadducts of synthetic and pharmaceutical value. Cycloaddition reactions of ynamides are the facile and preferable routes for the construction of structural motifs having striking importance in synthetic, medicinal chemistry, and advanced materials. In this systematic review, we highlighted the recently reported novel transformations and synthetic applications that involved the cycloaddition reaction of ynamides. The scope along with the limitations of the transformations are discussed in detail. Synthetic potential of ynamides and ynamide-derived advanced intermediates in cycloaddition reactions with different reaction partners to yield versatile heterocyclic adducts.![]()
Collapse
Affiliation(s)
- Ramsha Iftikhar
- Department of Chemistry, Government College University Faisalabad38000-FaisalabadPakistan
| | - Aqsa Mazhar
- Faculty of Health and Medicine, University of New South Wales2033-SydneyAustralia
| | - Muhammad Saqlain Iqbal
- Department of Electrical Information Engineering, Polytechnic University of Bari70126-BariItaly
| | - Faiza Zahid Khan
- Institute of Chemistry, RheinischeFriedrich-Wilhelms-Universität BonnBonnGermany
| | - Syed Hassan Askary
- Department of Chemistry, University of Management and Technology54770-LahorePakistan
| | - Hifza Sibtain
- Department of Chemistry, University of Management and Technology54770-LahorePakistan
| |
Collapse
|
2
|
Li Y, Song G, Liu Y, Li J. Theoretical Study of Mechanism and Product Selectivity of Metal-Catalyzed Reactions of Alkynyl Thioethers with Isoxazoles/Anthranils. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
3
|
Davies PW. Gold-Catalyzed Annulations with Nucleophilic Nitrenoids Enabled by Heteroatom-Substituted Alkynes. CHEM REC 2021; 21:3964-3977. [PMID: 34708496 DOI: 10.1002/tcr.202100205] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/18/2021] [Accepted: 09/20/2021] [Indexed: 11/07/2022]
Abstract
The combination of a nucleophilic nitrene equivalent, a triple bond and a π-acid catalyst has underpinned numerous efficient transformations for the preparation of azacycles. This personal account details our efforts in developing an annulation strategy. Adding a nucleophilic nitrenoid to an activated alkyne can generate carbenoid character that is then quenched by a cyclisation onto the nitrenoid substituent. The use and development of N-acyl and N-heterocyclic pyridinium-N-aminides as 1,3-N,O and 1,3-N,N-dipole equivalents is discussed in the context of oxazole and heterocycle-fused imidazole formation, respectively. The resulting processes are highly efficient, practically straightforward, and tolerate considerable structural and functional group variation. Our use of heteroatom-substituted alkynes as enabling tools for reaction discovery is discussed. The reactivity accessed from the strong donor-like properties of ynamides is complemented by that obtained from alkynyl thioethers, which are emerging as interesting substrates for π-acid catalysis.
Collapse
Affiliation(s)
- Paul W Davies
- School of Chemistry, University of Birmingham Edgbaston, Birmingham, B15 2TT, UK
| |
Collapse
|
4
|
Simm PE, Sekar P, Richardson J, Davies PW. Gold(I)-Catalyzed Synthesis of 3-Sulfenyl Pyrroles and Indoles by a Regioselective Annulation of Alkynyl Thioethers. ACS Catal 2021; 11:6357-6362. [PMID: 34306808 PMCID: PMC8291588 DOI: 10.1021/acscatal.1c01457] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/03/2021] [Indexed: 01/01/2023]
Abstract
![]()
The combination of
nucleophilic nitrenoids and π-acid catalysis
has emerged as a powerful tool in heterocycle synthesis. Accessing
more varied heterocycle-substitution patterns by maintaining the same
reaction pathways across different alkynes remains a challenge. Here
we show that Au(I) catalysis of isoxazole-based nitrenoids with alkynyl
thioethers provides controlled access to (3 + 2) annulation by a regioselective
addition β to the sulfenyl group. The reaction with isoxazole-containing
nitrenoids delivers sulfenylated pyrroles and indoles as single regioisomers
bearing useful functional groups and structural variety.
Collapse
Affiliation(s)
- Peter E. Simm
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Prakash Sekar
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | | | - Paul W. Davies
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| |
Collapse
|
5
|
Hu YC, Zhao Y, Wan B, Chen QA. Reactivity of ynamides in catalytic intermolecular annulations. Chem Soc Rev 2021; 50:2582-2625. [PMID: 33367365 DOI: 10.1039/d0cs00283f] [Citation(s) in RCA: 82] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Ynamides are unique alkynes with a carbon-carbon triple bond directly attached to the nitrogen atom bearing an electron-withdrawing group. The alkyne is strongly polarized by the electron-donating nitrogen atom, but its high reactivity can be finely tempered by the electron-withdrawing group. Accordingly, ynamides are endowed with both nucleophilic and electrophilic properties and their chemistry has been an active research field. The catalytic intermolecular annulations of ynamides, featuring divergent assembly of structurally important amino-heterocycles in a regioselective manner, have gained much attention over the past decade. This review aims to provide a comprehensive summary of the advances achieved in this area involving transition metal and acid catalysis. Moreover, the intermolecular annulations of ynamide analogs including ynol ethers and thioalkynes are also discussed, which can provide insights into the reactivity difference caused by the heteroatoms.
Collapse
Affiliation(s)
- Yan-Cheng Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| | - Yingying Zhao
- School of Chemistry and Chemical Engineering, Liaoning Normal University, 850 Huanghe Road, Dalian 116029, China
| | - Boshun Wan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| | - Qing-An Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| |
Collapse
|
6
|
Zhang H, Zhang R, Wang L, Li Y, Liao S, Zhou M. Synthesis Strategies for α‐, β‐, γ‐ and δ‐Carbolines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000690] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hong Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education) Guizhou Medical University Guiyang 550004 P. R. China
- School of Pharmacy Guizhou Medical University Guian New District Guizhou 550004 P. R. China
| | - Rong‐Hong Zhang
- National Joint Local Engineering Laboratory for Cell Engineering and Biomedicine Technique Guizhou Province Key Laboratory of Regenerative Medicine Key Laboratory of Adult Stem Cell Translational Research (Chinese Academy of Medical Sciences) Center for Tissue Engineering and Stem Cell Research Guizhou Medical University Guiyang 550004 PR China
| | - Li‐Xia Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education) Guizhou Medical University Guiyang 550004 P. R. China
- School of Pharmacy Guizhou Medical University Guian New District Guizhou 550004 P. R. China
| | - Yong‐Jun Li
- State Key Laboratory of Functions and Applications of Medicinal Plants Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education) Guizhou Medical University Guiyang 550004 P. R. China
- School of Pharmacy Guizhou Medical University Guian New District Guizhou 550004 P. R. China
| | - Shang‐Gao Liao
- State Key Laboratory of Functions and Applications of Medicinal Plants Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education) Guizhou Medical University Guiyang 550004 P. R. China
- School of Pharmacy Guizhou Medical University Guian New District Guizhou 550004 P. R. China
| | - Meng Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education) Guizhou Medical University Guiyang 550004 P. R. China
- School of Pharmacy Guizhou Medical University Guian New District Guizhou 550004 P. R. China
| |
Collapse
|
7
|
Dubovtsev AY, Zvereva VV, Shcherbakov NV, Dar'in DV, Novikov AS, Kukushkin VY. Acid-catalyzed [2 + 2 + 2] cycloaddition of two cyanamides and one ynamide: highly regioselective synthesis of 2,4,6-triaminopyrimidines. Org Biomol Chem 2021; 19:4577-4584. [PMID: 33954321 DOI: 10.1039/d1ob00513h] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Triflic acid (10 mol%) catalyzes the highly regioselective [2 + 2 + 2] cycloaddition between two cyanamides and one ynamide to grant the 2,4,6-triaminopyrimidine core. The developed synthetic method is effective for the preparation of a family of the diversely substituted heterocyclic products (30 examples; yields up to 94%). The synthesis can be easily scaled up and conducted in gram quantities. As demonstrated by the post-functionalizations involving the amino-substituents, the obtained heterocycles represent a useful platform for the construction of miscellaneous pyrimidine-based frameworks. The performed density functional theory calculations verified a particular role of H+, functioning as an electrophilic activator, in the regioselectivity of the cycloaddition.
Collapse
Affiliation(s)
- Alexey Yu Dubovtsev
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation.
| | - Valeria V Zvereva
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation.
| | - Nikolay V Shcherbakov
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation.
| | - Dmitry V Dar'in
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation.
| | - Alexander S Novikov
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation.
| | - Vadim Yu Kukushkin
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation. and South Ural State University, 76, Lenin Av., 454080 Chelyabinsk, Russian Federation
| |
Collapse
|
8
|
An D, Zhang W, Pan B, Zhao Y. Metal‐Free Hydrophosphoryloxylation of Ynamides: Rapid Access to Enol Phosphates. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001335] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Dalie An
- Liaoning Normal University 850 Huanghe Road Dalian 116029 China
| | - Weinan Zhang
- Liaoning Normal University 850 Huanghe Road Dalian 116029 China
| | - Bin Pan
- Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization Weifang University of Science and Technology Shouguang 262700 China
| | - Yingying Zhao
- Liaoning Normal University 850 Huanghe Road Dalian 116029 China
| |
Collapse
|
9
|
Lynch CC, Sripada A, Wolf C. Asymmetric synthesis with ynamides: unique reaction control, chemical diversity and applications. Chem Soc Rev 2020; 49:8543-8583. [PMID: 33073285 PMCID: PMC8383824 DOI: 10.1039/d0cs00769b] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ynamides are among the most powerful building blocks in organic synthesis and have become invaluable starting materials for the construction of multifunctional compounds and challenging architectures that would be difficult to prepare otherwise. The rapidly growing popularity originates from the unique reactivity and ease of manipulation of the polarized ynamide triple bond, the advance of practical methods for making them, and the simplicity of storage and handling. These attractive features and the demonstration of numerous synthetic applications have spurred the development of intriguing asymmetric reaction strategies during the last decade. An impressive variety of chemo-, regio- and stereoselective carbon-carbon and carbon-heteroatom bond forming reactions with ynamides have been developed and now significantly enrich the toolbox of synthetic chemists. This review provides a comprehensive overview of asymmetric ynamide chemistry since 2010 with a focus on the general scope, current limitations, stereochemical reaction control and mechanistic aspects.
Collapse
Affiliation(s)
- Ciarán C Lynch
- Department of Chemistry, Georgetown University, 37th and O Streets, Washington, DC 20057, USA.
| | | | | |
Collapse
|
10
|
Abstract
Over the past two decades, the development and application of ynamide chemistry have received more and more attention. Ynamides have proven to be versatile reagents for organic synthesis, and have been widely applied to the rapid assembly of a diverse range of structurally complex N-containing molecules, especially the valuable N-heterocycles. In comparison with the well-established transition metal-catalyzed reactions of ynamides, metal-free ynamide transformations have relatively seldom been exploited. Recently, Brønsted acid-mediated reactions of ynamides represent significant advances in ynamide chemistry. This review summarizes the latest trends and developments of Brønsted acid-mediated reactions of ynamides, including cycloaddition, cyclization, intramolecular alkoxylation-initiated rearrangement, oxygen atom transfer reactions and hydro-heteroatom addition reactions.
Collapse
Affiliation(s)
- Yang-Bo Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
| | | | | |
Collapse
|
11
|
Yang W, Liu X, Leung P, Li Y, Yang D, Chen Y. Iron‐Mediated Ring‐Opening and Rearrangement Cascade Synthesis of Polysubstituted Pyrroles from 4‐Alkenylisoxazoles. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901649] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Wen Yang
- Department of Chemistry and BiochemistryQueens College of the City University of New York 65-30 Kissena Blvd., Queens New York 11367 USA
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of ChemistrySouth China Normal University Guangzhou 510006 People's Republic of China
| | - Xiaochen Liu
- Department of Chemistry and BiochemistryQueens College of the City University of New York 65-30 Kissena Blvd., Queens New York 11367 USA
- Ph.D. Program in Chemistry, TheGraduate Center of the City University of New York 365 Fifth Ave. New York, New York 10016 USA
| | - Pak‐Hing Leung
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Dingqiao Yang
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of ChemistrySouth China Normal University Guangzhou 510006 People's Republic of China
| | - Yu Chen
- Department of Chemistry and BiochemistryQueens College of the City University of New York 65-30 Kissena Blvd., Queens New York 11367 USA
- Ph.D. Program in Chemistry, TheGraduate Center of the City University of New York 365 Fifth Ave. New York, New York 10016 USA
| |
Collapse
|
12
|
Qian LL, Min XT, Hu YC, Shen BX, Yang SN, Wan B, Chen QA. Ruthenium(ii)-catalyzed intermolecular annulation of alkenyl sulfonamides with alkynes: access to bicyclic sultams. Chem Commun (Camb) 2020; 56:2614-2617. [PMID: 32016279 DOI: 10.1039/d0cc00093k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A ruthenium-catalyzed allylic C(sp3)-H activation strategy has been employed to develop an intermolecular coupling of alkenyl sulfonamides with alkynes. This protocol features the diastereoselective construction of [3.3.0] and [4.3.0] bicyclic sultams in one step.
Collapse
Affiliation(s)
- Lei-Lei Qian
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Xiang-Ting Min
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Yan-Cheng Hu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Bing-Xue Shen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Sa-Na Yang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. and University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Boshun Wan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Qing-An Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| |
Collapse
|
13
|
Tian X, Song L, Farshadfar K, Rudolph M, Rominger F, Oeser T, Ariafard A, Hashmi ASK. Acyl Migration versus Epoxidation in Gold Catalysis: Facile, Switchable, and Atom-Economic Synthesis of Acylindoles and Quinoline Derivatives. Angew Chem Int Ed Engl 2020; 59:471-478. [PMID: 31622542 PMCID: PMC6972584 DOI: 10.1002/anie.201912334] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Indexed: 12/13/2022]
Abstract
We report a switchable synthesis of acylindoles and quinoline derivatives via gold-catalyzed annulations of anthranils and ynamides. α-Imino gold carbenes, generated in situ from anthranils and an N,O-coordinated gold(III) catalyst, undergo electrophilic attack to the aryl π-bond, followed by unexpected and highly selective 1,4- or 1,3-acyl migrations to form 6-acylindoles or 5-acylindoles. With the (2-biphenyl)di-tert-butylphosphine (JohnPhos) ligand, gold(I) carbenes experienced carbene/carbonyl additions to deliver quinoline oxides. Some of these epoxides are valuable substrates for the preparation of 3-hydroxylquinolines, quinolin-3(4H)-ones, and polycyclic compounds via facile in situ rearrangements. The reaction can be efficiently conducted on a gram scale and the obtained products are valuable substrates for preparing other potentially useful compounds. A computational study explained the unexpected selectivities and the dependency of the reaction pathway on the oxidation state and ligands of gold. With gold(III) the barrier for the formation of the strained oxirane ring is too high; whereas with gold(I) this transition state becomes accessible. Furthermore, energetic barriers to migration of the substituents on the intermediate sigma-complexes support the observed substitution pattern in the final product.
Collapse
Affiliation(s)
- Xianhai Tian
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Lina Song
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Kaveh Farshadfar
- Department of ChemistryIslamic Azad University, Central Tehran Branch, PoonakTehranIran
| | - Matthias Rudolph
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Frank Rominger
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Thomas Oeser
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Alireza Ariafard
- Department of ChemistryIslamic Azad University, Central Tehran Branch, PoonakTehranIran
- School of Physical SciencesUniversity of TasmaniaPrivate Bag 75HobartTasmania7001Australia
| | - A. Stephen K. Hashmi
- Institut für Organische ChemieHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| |
Collapse
|
14
|
Zhou L, Yang L, Dai S, Gao Y, Fang R, Kirillov AM, Yang L. Insight into the reaction mechanism and chemoselectivity in the cycloaddition of ynamides and isoxazoles with H2O. Catal Sci Technol 2020. [DOI: 10.1039/c9cy01964b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism and chemoselectivity in the cycloaddition of ynamides and isoxazoles have been explored by the density functional theory (DFT) in model systems composed of a Brønsted acid (HNTf2), gold(i) [IPrAuNTf2] or platinum(ii) (PtCl2/CO) catalyst.
Collapse
Affiliation(s)
- Lin Zhou
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Li Yang
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Songshan Dai
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yuanyuan Gao
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Ran Fang
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Alexander M. Kirillov
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- Lisbon
- Portugal
| | - Lizi Yang
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| |
Collapse
|
15
|
Nan GM, Li X, Yao TY, Yan TX, Wen LR, Li M. InCl3-catalyzed 5-exo-dig cyclization/1,6-conjugate addition of N-propargylamides with p-QMs to construct oxazole derivatives. Org Biomol Chem 2020; 18:1780-1784. [DOI: 10.1039/c9ob02651g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An InCl3-catalyzed tandem intramolecular 5-exo-dig cyclization/1,6-conjugate addition/aromatization of N-propargylamides with p-QMs to produce oxazoles tethering diarylmethane has been successfully developed.
Collapse
Affiliation(s)
- Guang-Ming Nan
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
| | - Xue Li
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
| | - Tian-Yu Yao
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Ting-Xun Yan
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Li-Rong Wen
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Ming Li
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
- State Key Laboratory Base of Eco-Chemical Engineering
| |
Collapse
|
16
|
Zhu X, Wang Z, Hou B, Zhang H, Deng C, Ye L. Zinc‐Catalyzed Asymmetric Formal [4+3] Annulation of Isoxazoles with Enynol Ethers by 6π Electrocyclization: Stereoselective Access to 2
H
‐Azepines. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912534] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xin‐Qi Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Ze‐Shu Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Bo‐Shang Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Hao‐Wen Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
| | - Chao Deng
- Jiangsu Key Laboratory of Pesticide Science and Department of Chemistry College of Sciences Nanjing Agricultural University Nanjing 210095 China
| | - Long‐Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory for Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
- State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
| |
Collapse
|
17
|
Zhu XQ, Wang ZS, Hou BS, Zhang HW, Deng C, Ye LW. Zinc-Catalyzed Asymmetric Formal [4+3] Annulation of Isoxazoles with Enynol Ethers by 6π Electrocyclization: Stereoselective Access to 2H-Azepines. Angew Chem Int Ed Engl 2019; 59:1666-1673. [PMID: 31724314 DOI: 10.1002/anie.201912534] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/31/2019] [Indexed: 12/17/2022]
Abstract
6π electrocyclization has attracted interest in organic synthesis because of its high stereospecificity and atom economy in the construction of versatile 5-7-membered cycles. However, examples of asymmetric 6π electrocyclization are quite scarce, and have to rely on the use of chiral organocatalysts, and been limited to pentadienyl-anion- and triene-type 6π electrocyclizations. Described herein is a zinc-catalyzed formal [4+3] annulation of isoxazoles with 3-en-1-ynol ethers via 6π electrocyclization, leading to the site-selective synthesis of functionalized 2H-azepines and 4H-azepines in good to excellent yields with broad substrate scope. Moreover, this strategy has also been used to produce chiral 2H-azepines with high enantioselectivities (up to 97:3 e.r.). This protocol not only is the first asymmetric heptatrienyl-cation-type 6π electrocyclization, but also is the first asymmetric reaction of isoxazoles with alkynes and the first asymmetric catalysis based on ynol ethers.
Collapse
Affiliation(s)
- Xin-Qi Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Ze-Shu Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Bo-Shang Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Hao-Wen Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Chao Deng
- Jiangsu Key Laboratory of Pesticide Science and Department of Chemistry, College of Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Long-Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| |
Collapse
|
18
|
Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2018. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
19
|
Tian X, Song L, Farshadfar K, Rudolph M, Rominger F, Oeser T, Ariafard A, Hashmi ASK. Acyl Migration versus Epoxidation in Gold Catalysis: Facile, Switchable, and Atom‐Economic Synthesis of Acylindoles and Quinoline Derivatives. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912334] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Xianhai Tian
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lina Song
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Kaveh Farshadfar
- Department of Chemistry Islamic Azad University, Central Tehran Branch, Poonak Tehran Iran
| | - Matthias Rudolph
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Frank Rominger
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Thomas Oeser
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Alireza Ariafard
- Department of Chemistry Islamic Azad University, Central Tehran Branch, Poonak Tehran Iran
- School of Physical Sciences University of Tasmania Private Bag 75 Hobart Tasmania 7001 Australia
| | - A. Stephen K. Hashmi
- Institut für Organische Chemie Heidelberg University Im Neuenheimer Feld 270 69120 Heidelberg Germany
| |
Collapse
|
20
|
Ao C, Yang X, Jia S, Xu X, Yuan Y, Zhang D, Hu W. Zinc-Catalyzed Alkyne-Carbonyl Metathesis of Ynamides with Isatins: Stereoselective Access to Fully Substituted Alkenes. J Org Chem 2019; 84:15331-15342. [PMID: 31702914 DOI: 10.1021/acs.joc.9b02350] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A zinc-catalyzed intermolecular alkyne-carbonyl metathesis reaction of ynamides with isatins followed by an amide to ester conversion has been developed, which produces the indolone derivatives with a fully substituted alkene species in good to high yields. The salient features of this reaction include the following: mild reaction conditions, an inexpensive zinc catalyst, a broad substrate scope, the excellent regiocontrol and stereoselectivity, and amenable to the gram scale.
Collapse
Affiliation(s)
- Chaoqun Ao
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Xiaohan Yang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Shikun Jia
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Xinfang Xu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Yanqiu Yuan
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Dan Zhang
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , China
| |
Collapse
|
21
|
Yang W, Chen Y, Yao Y, Lin Q, Yang D. Iron‐Promoted Reductive Ring‐Opening and Isomerization Reactions of C4‐Alkynylisoxazoles Leading to 2‐Alkynylenaminones and Polysubstituted Furans. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901176] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Wen Yang
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of Chemistry, South ChinaNormal University Guangzhou 510006 People's Republic of China
| | - Yu Chen
- Department of Chemistry and BiochemistryQueens College of the City University of New York 65-30 Kissena Blvd., Queens New York 11367 United States
| | - Yongqi Yao
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of Chemistry, South ChinaNormal University Guangzhou 510006 People's Republic of China
| | - Qifu Lin
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of Chemistry, South ChinaNormal University Guangzhou 510006 People's Republic of China
| | - Dingqiao Yang
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, College of Chemistry, South ChinaNormal University Guangzhou 510006 People's Republic of China
| |
Collapse
|
22
|
Song L, Tian X, Rudolph M, Rominger F, Hashmi ASK. Gold(iii)-catalyzed chemoselective annulations of anthranils with N-allylynamides for the synthesis of 3-azabicyclo[3.1.0]hexan-2-imines. Chem Commun (Camb) 2019; 55:9007-9010. [PMID: 31290870 DOI: 10.1039/c9cc04027g] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We herein report the gold(iii)-catalyzed selective annulation of anthranils with N-allylynamides under mild conditions. By trapping the in situ-generated α-imino gold carbenes, 3-azabicyclo[3.1.0]hexan-2-imines were obtained in high synthetic efficiency. The reaction, which can be conducted in the gram scale, tolerates electron-rich and electron-deficient anthranils as well as a diverse set of functionalized ynamides (aryl- and alkyl-substituted terminal).
Collapse
Affiliation(s)
- Lina Song
- Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Xianhai Tian
- Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Matthias Rudolph
- Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Frank Rominger
- Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - A Stephen K Hashmi
- Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany. and Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| |
Collapse
|
23
|
Tian X, Song L, Rudolph M, Rominger F, Hashmi ASK. Synthesis of 2-Aminoindoles through Gold-Catalyzed C–H Annulations of Sulfilimines with N-Arylynamides. Org Lett 2019; 21:4327-4330. [DOI: 10.1021/acs.orglett.9b01501] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Xianhai Tian
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Lina Song
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Matthias Rudolph
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Frank Rominger
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - A. Stephen K. Hashmi
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| |
Collapse
|
24
|
Li L, Zhu XQ, Zhang YQ, Bu HZ, Yuan P, Chen J, Su J, Deng X, Ye LW. Metal-free alkene carbooxygenation following tandem intramolecular alkoxylation/Claisen rearrangement: stereocontrolled access to bridged [4.2.1] lactones. Chem Sci 2019; 10:3123-3129. [PMID: 30996895 PMCID: PMC6429610 DOI: 10.1039/c9sc00079h] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 01/23/2019] [Indexed: 12/14/2022] Open
Abstract
Alkene carbooxygenation has attracted considerable attention over the past few decades as this approach provides an efficient access to various oxygen-containing molecules, especially the valuable O-heterocycles. However, examples of catalytic alkene carbooxygenation via a direct C-O cleavage are quite scarce, and the C-O cleavage in these cases is invariably initiated by transition metal-catalyzed oxidative addition. We report here a novel Brønsted acid-catalyzed intramolecular alkoxylation-initiated tandem sequence, which represents the first metal-free intramolecular alkoxylation/Claisen rearrangement. Significantly, an unprecedented Brønsted acid-catalyzed intramolecular alkene insertion into the C-O bond via a carbocation pathway was discovered. This method allows the stereocontrolled synthesis of valuable indole-fused bridged [4.2.1] lactones, providing ready access to biologically relevant scaffolds in a single synthetic step from an acyclic precursor. Moreover, such an asymmetric cascade cyclization has also been realized by employing a traceless chiral directing group. Control experiments favor the feasibility of a carbocation pathway for the process. In addition, biological tests showed that some of these newly synthesized indole-fused lactones exhibited their bioactivity as antitumor agents against different breast cancer cells, melanoma cells, and esophageal cancer cells.
Collapse
Affiliation(s)
- Long Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
| | - Xin-Qi Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
| | - Ying-Qi Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
| | - Hao-Zhen Bu
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
| | - Peng Yuan
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
| | - Jinyu Chen
- State Key Laboratory of Cellular Stress Biology , School of Life Sciences , Xiamen University , Xiamen , Fujian 361102 , China
| | - Jingyi Su
- State Key Laboratory of Cellular Stress Biology , School of Life Sciences , Xiamen University , Xiamen , Fujian 361102 , China
| | - Xianming Deng
- State Key Laboratory of Cellular Stress Biology , School of Life Sciences , Xiamen University , Xiamen , Fujian 361102 , China
| | - Long-Wu Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces , Key Laboratory for Chemical Biology of Fujian Province , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
- State Key Laboratory of Organometallic Chemistry , Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , Shanghai 200032 , China
- State Key Laboratory of Elemento-Organic Chemistry , Nankai University , Tianjin 300071 , China
| |
Collapse
|
25
|
Anitha M, Shankar M, Kumara Swamy KC. Reactivity of epoxy-ynamides with metal halides: nucleophile (Br/Cl/OH)-assisted tandem intramolecular 5-exo-digor 6-endo-digcyclisation and AgF2-promoted oxidation. Org Chem Front 2019. [DOI: 10.1039/c9qo00027e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Several metal halides (CuBr, LiCl, CuF2, AgF2) react with epoxy-ynamides to afford 1,3-oxazolidines, 1,4-oxazines or 1,2-dioxo-enamides.
Collapse
Affiliation(s)
- Mandala Anitha
- School of Chemistry
- University of Hyderabad
- Hyderabad 500 046
- India
| | | | | |
Collapse
|
26
|
Wen H, Cao W, Liu Y, Wang L, Chen P, Tang Y. Metal-Free [2 + 2 + 2] Cycloaddition of Ynamide-Nitriles with Ynamides: A Highly Regio- and Chemoselective Synthesis of δ-Carboline Derivatives. J Org Chem 2018; 83:13308-13324. [PMID: 30353730 DOI: 10.1021/acs.joc.8b02112] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A metal-free formal [2 + 2 + 2] cycloaddition of functionalized ynamide-nitriles with ynamides is disclosed which offers highly efficient access to polysubstituted δ-carboline derivatives under the mediation of TfOH. This strategy is highly regioselective and chemoselective and displays mild conditions, high yields, and efficiency (within 1 min) in addition to substrates scopes (56 examples).
Collapse
Affiliation(s)
- Hao Wen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Yushan Road , Qingdao , 266003 , People's Republic of China
| | - Wei Cao
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Yushan Road , Qingdao , 266003 , People's Republic of China
| | - Yu Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Yushan Road , Qingdao , 266003 , People's Republic of China
| | - Liang Wang
- College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , People's Republic of China
| | - Ping Chen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Yushan Road , Qingdao , 266003 , People's Republic of China
| | - Yu Tang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Yushan Road , Qingdao , 266003 , People's Republic of China.,Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and Technology , Qingdao 266237 , People's Republic of China
| |
Collapse
|