1
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Yue T, Kusakabe T, Tsukamoto T, Takahashi K, Kikkawa S, Azumaya I, Kato K. Cyclization-Carbonylation of 2-Alkynyl Primary Benzamides using p-Benzoquinone under Neutral Conditions. J Org Chem 2024; 89:3977-3986. [PMID: 38407947 DOI: 10.1021/acs.joc.3c02812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
A palladium-catalyzed cyclization-carbonylation of 2-alkynyl primary benzamides 1 afforded methyl 3-substituted 1-methoxyisoquinoline-4-carboxylates 6 in good to moderate yields. In the case of mesylate 1r, 12 was obtained directly via a cyclization-carbonylation-cyclization cascade. Compounds 6 were converted to isoquinolin-1(2H)-ones 8 in good yields under microwave irradiation. In the case of the mesylate 6q, tricyclic isoquinolinone 10 was obtained in good yield. The reactions of thiophene-2-carboxamide derivatives also proceeded well.
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Affiliation(s)
- Tianci Yue
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Taichi Kusakabe
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Takuya Tsukamoto
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Takahashi
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Shoko Kikkawa
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Isao Azumaya
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences, Toho University 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
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2
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Liu M, Huang M, Li W, Yan Y, Li M, Zhang X. Enantioselective Synthesis of Axially Chiral N‐Aryl‐3‐methyleneisoindolin‐1‐ones. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Min Liu
- Chengdu Institute of Organic Chemistry Chinese Academy of Sciences: Chengdu Organic Chemicals Co Ltd Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province CHINA
| | - Min Huang
- Chengdu Institute of Organic Chemistry Chinese Academy of Sciences: Chengdu Organic Chemicals Co Ltd Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province CHINA
| | - Wenzhe Li
- Chengdu Institute of Organic Chemistry Chinese Academy of Sciences: Chengdu Organic Chemicals Co Ltd Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province CHINA
| | - Yingkun Yan
- Chengdu Institute of Organic Chemistry Chinese Academy of Sciences: Chengdu Organic Chemicals Co Ltd Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province CHINA
| | - Min Li
- Chengdu Institute of Organic Chemistry Chinese Academy of Sciences: Chengdu Organic Chemicals Co Ltd Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province CHINA
| | - Xiaomei Zhang
- Chengdu Institute of Organic Chemistry Key Laboratory for Asymmetric Synthesis and Chiraltechnology of Sichuan Province Ren Min Nan Lu 610041 Chengdu CHINA
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3
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Topolovčan N, Duplić F, Gredičak M. Influence of
N
‐Substitution in 3‐Alkyl‐3‐hydroxyisoindolin‐1‐ones on the Stereoselectivity of Brønsted Acid‐Catalyzed Synthesis of 3‐Methyleneisoindolin‐1‐ones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nikola Topolovčan
- Division of Organic Chemistry and Biochemistry Ruđer Bošković Institute Bijenička cesta 54 10000 Zagreb Croatia
| | - Filip Duplić
- Division of Organic Chemistry and Biochemistry Ruđer Bošković Institute Bijenička cesta 54 10000 Zagreb Croatia
| | - Matija Gredičak
- Division of Organic Chemistry and Biochemistry Ruđer Bošković Institute Bijenička cesta 54 10000 Zagreb Croatia
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4
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Guo J, Ibanez-Lopez AS, Gao H, Quach V, Coley CW, Jensen KF, Barzilay R. Automated Chemical Reaction Extraction from Scientific Literature. J Chem Inf Model 2021; 62:2035-2045. [PMID: 34115937 DOI: 10.1021/acs.jcim.1c00284] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Access to structured chemical reaction data is of key importance for chemists in performing bench experiments and in modern applications like computer-aided drug design. Existing reaction databases are generally populated by human curators through manual abstraction from published literature (e.g., patents and journals), which is time consuming and labor intensive, especially with the exponential growth of chemical literature in recent years. In this study, we focus on developing automated methods for extracting reactions from chemical literature. We consider journal publications as the target source of information, which are more comprehensive and better represent the latest developments in chemistry compared to patents; however, they are less formulaic in their descriptions of reactions. To implement the reaction extraction system, we first devised a chemical reaction schema, primarily including a central product, and a set of associated reaction roles such as reactants, catalyst, solvent, and so on. We formulate the task as a structure prediction problem and solve it with a two-stage deep learning framework consisting of product extraction and reaction role labeling. Both models are built upon Transformer-based encoders, which are adaptively pretrained using domain and task-relevant unlabeled data. Our models are shown to be both effective and data efficient, achieving an F1 score of 76.2% in product extraction and 78.7% in role extraction, with only hundreds of annotated reactions.
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Affiliation(s)
- Jiang Guo
- Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, Massachusetts 02139, United States
| | - A Santiago Ibanez-Lopez
- Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, Massachusetts 02139, United States
| | - Hanyu Gao
- Department of Chemical Engineering, MIT, Cambridge, Massachusetts 02139, United States
| | - Victor Quach
- Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, Massachusetts 02139, United States
| | - Connor W Coley
- Department of Chemical Engineering, MIT, Cambridge, Massachusetts 02139, United States
| | - Klavs F Jensen
- Department of Chemical Engineering, MIT, Cambridge, Massachusetts 02139, United States
| | - Regina Barzilay
- Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, Massachusetts 02139, United States
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5
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Zatsikha YV, Shamova LI, Blesener TS, Kuzmin IA, Germanov YV, Herbert DE, Nemykin VN. Development of a Class of Easily Scalable, Electron-Deficient, Core-Extended Benzo-Fused Azadipyrromethene Derivatives (“MB-DIPY”). J Org Chem 2019; 84:14540-14557. [DOI: 10.1021/acs.joc.9b02074] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yuriy V. Zatsikha
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Liliya I. Shamova
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Tanner S. Blesener
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Ilya A. Kuzmin
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Yaroslaw V. Germanov
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - David E. Herbert
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Victor N. Nemykin
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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6
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Mehta S, Brahmchari D. Phosphazene Superbase-Mediated Regio- and Stereoselective Iodoaminocyclization of 2-(1-Alkynyl)benzamides for the Synthesis of Isoindolin-1-ones. J Org Chem 2019; 84:5492-5503. [DOI: 10.1021/acs.joc.9b00452] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Saurabh Mehta
- Department of Applied Chemistry, Delhi Technological University, Delhi, 110042, India
| | - Dhirendra Brahmchari
- Department of Applied Chemistry, Delhi Technological University, Delhi, 110042, India
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7
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Chen X, Zhao S, Li H, Wang X, Geng A, Cui H, Lu T, Chen Y, Zhu Y. Design, synthesis and biological evaluation of novel isoindolinone derivatives as potent histone deacetylase inhibitors. Eur J Med Chem 2019; 168:110-122. [PMID: 30802729 DOI: 10.1016/j.ejmech.2019.02.032] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/10/2019] [Accepted: 02/10/2019] [Indexed: 12/21/2022]
Abstract
Histone deacetylases (HDACs) as appealing targets for the treatment of many diseases has been studied extensively and its use in cancer care is the most important. Here, we developed a series of novel derivatives containing isoindolinone skeleton. Twelve compounds demonstrated nanomolar IC50 values against HDAC1, and the best compounds were 5a (65.6 nM), 5b (65.1 nM) and 13a (57.9 nM). In vitro, 5a and 5b also showed potent antiproliferative activities against several cancer cell lines, in particular 5b, which behaved better than approved drug chidamide. Morever, enzyme inhibition and western blot assay established 5b to be a selective inhibitor for HDAC1-3. Molecular docking was performed to rationalize the high potency of isoindolinones. Additionally, 5b had more appropriate drug metabolism in human liver microsome (HLM) compared with chidamide and moderate pharmacokinetics properties. These results indicated that 5b was worthy of further biological studies.
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Affiliation(s)
- Xin Chen
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100, PR China
| | - Shuang Zhao
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Hongmei Li
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Xin Wang
- School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Aixin Geng
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Hao Cui
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China
| | - Tao Lu
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, 210009, PR China
| | - Yadong Chen
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China.
| | - Yong Zhu
- School of Science, China Pharmaceutical University, Nanjing, 210009, PR China.
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8
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Chen Q, Bao Y, Yang X, Dai Z, Yang F, Zhou Q. Umpolung of o-Hydroxyaryl Azomethine Ylides: Entry to Functionalized γ-Aminobutyric Acid under Phosphine Catalysis. Org Lett 2018; 20:5380-5383. [DOI: 10.1021/acs.orglett.8b02297] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Qingqing Chen
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
| | - Yishu Bao
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
| | - Xiuqin Yang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
| | - Zonghao Dai
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
| | - Fulai Yang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, China
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9
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Yao C, Bao Y, Lu T, Zhou Q. Stereoselective Synthesis of Functionalized Benzooxazepino[5,4-a]isoindolone Derivatives via Cesium Carbonate Catalyzed Formal [5 + 2] Annulation of 2-(2-Hydroxyphenyl)isoindoline-1,3-dione with Allenoates. Org Lett 2018; 20:2152-2155. [DOI: 10.1021/acs.orglett.8b00382] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Chao Yao
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Yishu Bao
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China
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10
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Hazarika D, Phukan P. Copper-Catalyzed Stereoselective Domino Synthesis of (Z
)-3-Methyleneisoindolin-1-one. ChemistrySelect 2018. [DOI: 10.1002/slct.201702875] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Debojit Hazarika
- Department of Chemistry; Gauhati University; Guwahati, 781014 Assam India
| | - Prodeep Phukan
- Department of Chemistry; Gauhati University; Guwahati, 781014 Assam India
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11
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Laha JK, Kaur Hunjan M, Bhimpuria RA, Kathuria D, Bharatam PV. Geometry Driven Intramolecular Oxidative Cyclization of Enamides: An Umpolung Annulation of Primary Benzamides with Acrylates for the Synthesis of 3-Methyleneisoindolin-1-ones. J Org Chem 2017. [PMID: 28650166 DOI: 10.1021/acs.joc.7b00966] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joydev K. Laha
- Department
of Pharmaceutical Technology (Process Chemistry), ‡Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research, S. A.
S. Nagar, Punjab 160062, India
| | - Mandeep Kaur Hunjan
- Department
of Pharmaceutical Technology (Process Chemistry), ‡Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research, S. A.
S. Nagar, Punjab 160062, India
| | - Rohan A. Bhimpuria
- Department
of Pharmaceutical Technology (Process Chemistry), ‡Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research, S. A.
S. Nagar, Punjab 160062, India
| | - Deepika Kathuria
- Department
of Pharmaceutical Technology (Process Chemistry), ‡Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research, S. A.
S. Nagar, Punjab 160062, India
| | - Prasad V. Bharatam
- Department
of Pharmaceutical Technology (Process Chemistry), ‡Department of Medicinal
Chemistry, National Institute of Pharmaceutical Education and Research, S. A.
S. Nagar, Punjab 160062, India
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12
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Zhao S, Zhu Y, Wu Y, Lu T, Zhou Q. Phosphine-Catalyzed Domino Reactions of Allenoates with N
-Hydroxyphthalimides: Direct Method to 3 a-Hydroxyisoxazolo[3,2-a
]isoindol-8(3 aH
)-one Derivatives. ChemistrySelect 2017. [DOI: 10.1002/slct.201700102] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shuang Zhao
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry; China Pharmaceutical University; Nanjing 210009 P. R. China
| | - Yong Zhu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry; China Pharmaceutical University; Nanjing 210009 P. R. China
| | - Yichao Wu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry; China Pharmaceutical University; Nanjing 210009 P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry; China Pharmaceutical University; Nanjing 210009 P. R. China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry; China Pharmaceutical University; Nanjing 210009 P. R. China
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13
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Zhang L, Zhang B, Jiang T, Lu T, Zhou Q. Synthesis of tricyclic 3-hydroxyisoindolin-1-ones via triethylamine-catalyzed domino reactions of electron-deficient alkynes with phthalimidomalonate derivatives. Org Chem Front 2017. [DOI: 10.1039/c6qo00544f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A triethylamine-catalyzed domino reaction between phthalimidomalonate derivatives and activated alkynes has been developed under mild conditions.
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Affiliation(s)
- Li Zhang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Beichen Zhang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Teng Jiang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
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14
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Huang Z, Chen Q, Yang X, Liu Y, Zhang L, Lu T, Zhou Q. Phosphine-mediated domino reactions of phthalimidomalonates with allenoates or but-2-ynoate: facile entry into highly functionalized pyrroloisoindolinone derivatives. Org Chem Front 2017. [DOI: 10.1039/c6qo00775a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A phosphine-mediated γ-umpolung/Wittig/γ-umpolung reaction between phthalimidomalonates and allenoates/but-2-ynoate furnishes highly functionalized pyrroloisoindolinone derivatives in synthetically useful yields.
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Affiliation(s)
- Zhusheng Huang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Qingqing Chen
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Xiuqin Yang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Yang Liu
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Li Zhang
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
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15
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Palladium-Catalyzed Carbonylative Synthesis of 3-Methyleneisoindolin-1-ones from Ketimines with Hexacarbonylmolybdenum(0) as the Carbon Monoxide Source. ChemCatChem 2016. [DOI: 10.1002/cctc.201601306] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Chen Q, Li K, Lu T, Zhou Q. Phosphine-catalyzed domino reactions of alkynyl ketones with sulfonylhydrazones: construction of diverse pyrazoloquinazoline derivatives. RSC Adv 2016. [DOI: 10.1039/c6ra00580b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient method for the synthesis of C-1 position acyl substituted pyrazoloquinazoline derivatives via a PBu3-promoted domino process of sulfonylhydrazones and alkynyl ketones was developed.
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Affiliation(s)
- Qingqing Chen
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Kaixuan Li
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Tao Lu
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
| | - Qingfa Zhou
- State Key Laboratory of Natural Medicines
- Department of Organic Chemistry
- China Pharmaceutical University
- Nanjing
- P. R. China
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