1
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Sahoo R, Ghosh S, Bhatta S, Bisui S, Nanda S. Synthetic studies towards volvalerenol A: access to a fully functionalized cycloheptane framework in an asymmetric fashion through the exploitation of C2-symmetry. Org Biomol Chem 2024. [PMID: 39291289 DOI: 10.1039/d4ob01110d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
The enantioselective synthesis of a fully functionalized cycloheptane core of the naturally occurring triterpenoid volvalerenol A, exhibiting pseudo-C2 symmetry, was achieved. Enantioselective enzymatic desymmetrization (EED), asymmetric methallylation, and reductive ring opening of an cyclopropane overbred intermediate were the key reactions to access the cycloheptanone core. Further synthetic manipulations, via a unique "MPV" (Meerwein-Ponndorf-Verley) type reductive ring-opening of an epoxide and other synthetic transformations, afforded two fully functionalized cycloheptane frameworks of the target molecule.
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Affiliation(s)
- Rajkumar Sahoo
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Saubhik Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Suman Bhatta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Santu Bisui
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Samik Nanda
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
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2
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Li XL, Ru T, Navarro-Vázquez A, Lindemann P, Nazaré M, Li XW, Guo YW, Sun H. Weizhouochrones: Gorgonian-Derived Symmetric Dimers and Their Structure Elucidation Using Anisotropic NMR Combined with DP4+ Probability and CASE-3D. JOURNAL OF NATURAL PRODUCTS 2022; 85:1730-1737. [PMID: 35792821 DOI: 10.1021/acs.jnatprod.2c00257] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Natural product dimers have intriguing structural features and often have remarkable pharmacological activities. We report here two uncommon marine gorgonian-derived symmetric dimers, weizhouochrones A (1) and B (2), with indenone-derived monomers, that were isolated from the coral Anthogorgia ochracea collected from the South China Sea. These dimers are difficult targets for structure elucidation that solely relies upon conventional NMR data such as NOEs and J-couplings. Here, to explore the application of emerging methods on the structure elucidation of challenging molecules, we explored a number of different anisotropic and computational NMR approaches. The measurements of anisotropic NMR parameters of weizhouochrone A, including residual dipolar couplings (RDCs) and residual chemical shift anisotropy (RCSA), allowed us to successfully determine the planar structure and its relative configuration. This result was corroborated by a computational NMR analysis based on DP4+ probability and computer-assisted 3D structure elucidation (CASE-3D).
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Affiliation(s)
- Xiao-Lu Li
- Group of Structural Chemistry and Computational Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin 13125, Germany
| | - Tong Ru
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
- University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Armando Navarro-Vázquez
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Peter Lindemann
- Group of Medicinal Chemistry, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin 13125, Germany
| | - Marc Nazaré
- Group of Medicinal Chemistry, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin 13125, Germany
| | - Xu-Wen Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
- University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
- University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Han Sun
- Institute of Chemistry, Technical University of Berlin, Berlin 10623, Germany
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3
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Fan Y, Shen J, Liu Z, Xia K, Zhu W, Fu P. Methylene-bridged dimeric natural products involving one-carbon unit in biosynthesis. Nat Prod Rep 2022; 39:1305-1324. [DOI: 10.1039/d2np00022a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review summarizes the methylene-bridged dimeric natural products involving one-carbon unit in biosynthesis, including their structures, biological activities, synthetic methods, and formation mechanisms.
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Affiliation(s)
- Yaqin Fan
- Shandong Provincial Key Laboratory of Applied Mycology, School of Life Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Jingjing Shen
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Zhi Liu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Kunyu Xia
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Weiming Zhu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
| | - Peng Fu
- Key Laboratory of Marine Drugs, Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
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4
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Feng KX, Tang CK, Shen QY, Xia AB, Huang LS, Zhou ZY, Zhang X, Du XH, Xu DQ. Enantioselective Syntheses of C2-Symmetric Pyrazolones and Diones via One-Pot Organo-/Iodine Sequential Catalysis. Org Lett 2021; 23:6750-6755. [PMID: 34406770 DOI: 10.1021/acs.orglett.1c02330] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The catalytic diastereo- and enantioselective syntheses of C2-symmetric axially chiral 1,4-dicarbonyl derivatives with 2,3-quaternary stereocenters were achieved by utilizing an organo-/iodine binary catalytic strategy. The reactions proceeded well under mild conditions without metals or strong bases.
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Affiliation(s)
- Kai-Xiang Feng
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Cheng-Ke Tang
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Qiao-Yu Shen
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Ai-Bao Xia
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Li-Sha Huang
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Zhan-Yu Zhou
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Xing Zhang
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Xiao-Hua Du
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Dan-Qian Xu
- Catalytic Hydrogenation Research Center, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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5
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Magann NL, Blyth MT, Sherburn MS. Five Step Total Synthesis of Lythranidine. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107524] [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)
- Nicholas L. Magann
- Research School of Chemistry Australian National University Canberra ACT 2601 Australia
| | - Mitchell T. Blyth
- Research School of Chemistry Australian National University Canberra ACT 2601 Australia
| | - Michael S. Sherburn
- Research School of Chemistry Australian National University Canberra ACT 2601 Australia
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6
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Magann NL, Blyth MT, Sherburn MS. Five Step Total Synthesis of Lythranidine. Angew Chem Int Ed Engl 2021; 60:18561-18565. [PMID: 34156140 DOI: 10.1002/anie.202107524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Indexed: 12/25/2022]
Abstract
A concise synthesis of the alkaloid lythranidine is reported. The strategy exploits the target's local C2 symmetry by adopting a two directional synthetic approach, first in an acyclic environment, then in a cyclic system and finally in a bridged macrocyclic domain. The latter phase of the synthesis, which installs all four stereocenters, involves a thermodynamically controlled, twofold intermolecular/transannular aza-Michael addition and a twofold hydride reduction. The synthesis is one third of the length of the most step-economic previous approach, providing access to gram quantities of the natural product. The broad-spectrum nature of the synthesis is demonstrated through the preparation of three diastereomeric analogues of the natural product.
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Affiliation(s)
- Nicholas L Magann
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Mitchell T Blyth
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
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7
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Ge Z, Fan Y, Deng W, Zheng C, Li T, Yue J. Cephalodiones A–D: Compound Characterization and Semisynthesis by [6+6] Cycloaddition. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Zhan‐Peng Ge
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Yao‐Yue Fan
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Wen‐De Deng
- State Key Laboratory of Quality Research in Chinese Medicines Macau Institute for Applied Research in Medicine and Health Macau University of Science and Technology Avenida Wai Long Taipa, Macau 999078 China
| | - Cheng‐Yu Zheng
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
| | - Ting Li
- State Key Laboratory of Quality Research in Chinese Medicines Macau Institute for Applied Research in Medicine and Health Macau University of Science and Technology Avenida Wai Long Taipa, Macau 999078 China
| | - Jian‐Min Yue
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences 555 Zuchongzhi Road Shanghai 201203 China
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8
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Ge ZP, Fan YY, Deng WD, Zheng CY, Li T, Yue JM. Cephalodiones A-D: Compound Characterization and Semisynthesis by [6+6] Cycloaddition. Angew Chem Int Ed Engl 2021; 60:9374-9378. [PMID: 33527661 DOI: 10.1002/anie.202015332] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Indexed: 12/13/2022]
Abstract
Cephalodiones A-D (1-4), the first example of C19 -norditerpenoid dimers, were isolated and fully characterized from a Cephalotaxus plant. These new skeletal natural products shared a unique tricyclo[6.4.1.12,7 ]tetradeca-3,5,9,11-tetraene-13,14-dione core that was capped in both ends with rigid multicyclic ring systems either C2 -symmetrically or asymmetrically. Compounds 1-4 were proposed to be biosynthetically produced by the [6+6]-cycloaddition of two identical C19 -norditerpenoid troponoids, which was validated by the semisyntheses of dimers 2-4. Moreover, some compounds showed significant inhibition on Th17 cell differentiation.
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Affiliation(s)
- Zhan-Peng Ge
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Yao-Yue Fan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Wen-De Deng
- State Key Laboratory of Quality Research in Chinese Medicines, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, 999078, China
| | - Cheng-Yu Zheng
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
| | - Ting Li
- State Key Laboratory of Quality Research in Chinese Medicines, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, 999078, China
| | - Jian-Min Yue
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, China
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9
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Ueda H. Synthetic Studies toward Dimeric Indole Alkaloids Based on Convergent Synthetic Strategy. Chem Pharm Bull (Tokyo) 2020; 68:117-128. [PMID: 32009078 DOI: 10.1248/cpb.c19-00706] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The total syntheses of dimeric indole alkaloids, haplophytine, and T988s are described. These dimeric compounds comprising two structurally different indole units are ubiquitous in nature, and many possess pharmaceutically important activities. To realize an efficient chemical synthesis of these dimeric indole alkaloids, the establishment of convergent synthetic strategies and development of new coupling methods are indispensable. The linkage of two highly functionalized units at a late stage of the synthesis frequently induces synthetic problems such as chemoselectivity and steric repulsion. Moreover, although transition metal-catalyzed reactions are usually an effective method for the cross-coupling of two units, the application of these cross-coupling reactions to bond formation involving a sterically hindered C(sp3) is often difficult. Thus, even with precise modern synthetic methods, it is currently difficult to realize convergent syntheses of dimeric indole alkaloids possessing a quaternary carbon linking two units. To combat these synthetic problems, we developed a synthetic method to link two indole units using an Ag-mediated nucleophilic substitution reaction. In this review, we provide a detailed discussion of convergent synthetic strategies and coupling methods for dimeric indole alkaloids.
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Affiliation(s)
- Hirofumi Ueda
- Graduate School of Pharmaceutical Sciences, Tohoku University
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10
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Gubaidullin RR, Khalitova RR, Nedopekina DA, Spivak AY. Homo- and Cross Coupling of C-2 Propargyl Substituted Triterpenoic Acids: Synthesis of Novel Symmetrical and Unsymmetrical Triterpene 1,3-Diynes. ChemistrySelect 2018. [DOI: 10.1002/slct.201803522] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Rinat R. Gubaidullin
- Institute of Petrochemistry and Catalysis of Russian Academy of Sciences; 141 Prospekt Oktyabrya Ufa 450075 Russian Federation
| | - Rezeda R. Khalitova
- Institute of Petrochemistry and Catalysis of Russian Academy of Sciences; 141 Prospekt Oktyabrya Ufa 450075 Russian Federation
| | - Darya A. Nedopekina
- Institute of Petrochemistry and Catalysis of Russian Academy of Sciences; 141 Prospekt Oktyabrya Ufa 450075 Russian Federation
| | - Anna Yu. Spivak
- Institute of Petrochemistry and Catalysis of Russian Academy of Sciences; 141 Prospekt Oktyabrya Ufa 450075 Russian Federation
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11
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Tan F, Liu X, Wang Y, Dong S, Yu H, Feng X. Chiral Lewis Acid Catalyzed Reactions of α‐Diazoester Derivatives: Construction of Dimeric Polycyclic Compounds. Angew Chem Int Ed Engl 2018; 57:16176-16179. [DOI: 10.1002/anie.201810030] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/16/2018] [Indexed: 01/16/2023]
Affiliation(s)
- Fei Tan
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Yan Wang
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Han Yu
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
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12
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Tan F, Liu X, Wang Y, Dong S, Yu H, Feng X. Chiral Lewis Acid Catalyzed Reactions of α‐Diazoester Derivatives: Construction of Dimeric Polycyclic Compounds. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Fei Tan
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Yan Wang
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Han Yu
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & TechnologyMinistry of EducationCollege of ChemistrySichuan University Chengdu 610064 China
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13
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Abstract
This review defines symmetric molecules from a synthetic perspective and shows various strategies that take advantage of molecular symmetry to construct them.
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Affiliation(s)
- Wen-Ju Bai
- Department of Chemistry
- Stanford University
- Stanford
- USA
| | - Xiqing Wang
- College of Bioscience and Biotechnology
- Yangzhou University
- Yangzhou
- China
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14
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Zhao L, Tsukano C, Kwon E, Shirakawa H, Kaneko S, Takemoto Y, Hirama M. Competent Route to Unsymmetric Dimer Architectures: Total Syntheses of (−)-Lycodine and (−)-Complanadines A and B, and Evaluation of Their Neurite Outgrowth Activities. Chemistry 2016; 23:802-812. [PMID: 27758009 DOI: 10.1002/chem.201604647] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Le Zhao
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Chihiro Tsukano
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Eunsang Kwon
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Hisashi Shirakawa
- Department of Molecular Pharmacology; Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Shuji Kaneko
- Department of Molecular Pharmacology; Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Yoshiji Takemoto
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Kyoto University; Yoshida, Sakyo-ku, Kyoto 606-8501 Japan
| | - Masahiro Hirama
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
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15
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Liao SG, Yue JM. Dimeric Sesquiterpenoids. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 101 2016; 101:1-112. [DOI: 10.1007/978-3-319-22692-7_1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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16
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Nagatomo M, Hagiwara K, Masuda K, Koshimizu M, Kawamata T, Matsui Y, Urabe D, Inoue M. Symmetry-Driven Strategy for the Assembly of the Core Tetracycle of (+)-Ryanodine: Synthetic Utility of a Cobalt-Catalyzed Olefin Oxidation and α-Alkoxy Bridgehead Radical Reaction. Chemistry 2015; 22:222-9. [DOI: 10.1002/chem.201503640] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Indexed: 11/09/2022]
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17
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Zipfel HF, Carreira EM. A Unified Strategy to 6-5-6-5-6-Membered Epipolythiodiketopiperazines: Studies towards the Total Synthesis of Scabrosin Diacetate and Haematocin. Chemistry 2015; 21:12475-80. [PMID: 26179159 DOI: 10.1002/chem.201500918] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Indexed: 11/11/2022]
Abstract
The family of epipolythiodiketopiperazine (ETP) natural products consists of over 200 members possessing a wide diversity of structures and biological activity. Recently, the subgroup of 6-5-6-5-6-membered ETPs has gained substantial attention, which has resulted in several total syntheses. Despite all the efforts that have been invested into accessing these complex structures, no synthesis of scabrosin diacetate (1 a) and its related esters has been reported. Herein, our attempts towards scabrosin diacetate (1 a) and haematocin (3) starting from diketopiperazine 12 a as a late-stage intermediate are presented. Diketopiperazine 12 a can be conveniently accessed in multigram quantities from aldehyde 18 and diketopiperazine 21 and was envisioned to serve as a general platform for the synthesis of 6-5-6-5-6-membered ETPs.
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Affiliation(s)
- Hannes F Zipfel
- Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich (Switzerland)
| | - Erick M Carreira
- Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich (Switzerland).
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18
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Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Mukai K, Kasuya S, Nakagawa Y, Urabe D, Inoue M. A convergent total synthesis of ouabagenin. Chem Sci 2015; 6:3383-3387. [PMID: 28706702 PMCID: PMC5490423 DOI: 10.1039/c5sc00212e] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 03/28/2015] [Indexed: 11/21/2022] Open
Abstract
A convergent total synthesis of ouabagenin, an aglycon of cardenolide glycoside ouabain, was achieved by assembly of the AB-ring, D-ring and butenolide moieties.
A convergent total synthesis of ouabagenin, an aglycon of cardenolide glycoside ouabain, was achieved by assembly of the AB-ring, D-ring and butenolide moieties. The multiply oxygenated cis-decalin structure of the AB-ring was constructed from (R)-perillaldehyde through the Diels–Alder reaction and sequential oxidations. The intermolecular acetal formation of the AB-ring and D-ring fragments, and combination of the intramolecular radical and aldol reactions, assembled the requisite steroidal skeleton in a stereoselective fashion. Finally, stereoselective installation of the C17-butenolide via the Stille coupling and hydrogenation led to ouabagenin.
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Affiliation(s)
- Ken Mukai
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Satoshi Kasuya
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Yuki Nakagawa
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Daisuke Urabe
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan .
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20
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Urabe D, Asaba T, Inoue M. Convergent Strategies in Total Syntheses of Complex Terpenoids. Chem Rev 2015; 115:9207-31. [DOI: 10.1021/cr500716f] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Daisuke Urabe
- Graduate
School of Pharmaceutical
Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Taro Asaba
- Graduate
School of Pharmaceutical
Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate
School of Pharmaceutical
Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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21
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Ghosh S, Chaudhuri S, Bisai A. Oxidative Dimerization of 2-Oxindoles Promoted by KOtBu-I2: Total Synthesis of (±)-Folicanthine. Org Lett 2015; 17:1373-6. [PMID: 25745809 DOI: 10.1021/acs.orglett.5b00032] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Santanu Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal - 462 066, MP, India
| | - Saikat Chaudhuri
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal - 462 066, MP, India
| | - Alakesh Bisai
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal - 462 066, MP, India
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22
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Fu Z, Li Z, Xiong Q, Cai H. Facile synthesis of 2,2′-dinitrosubstituted biaryls through Cu-catalyzed ligand-free decarboxylative homocoupling of ortho-nitrobenzoic acids. RSC Adv 2015. [DOI: 10.1039/c5ra07771k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A novel waste-free Cu-catalyzed decarboxylative homocoupling of ortho-nitrobenzoic acids with different substituents on the phenyl core has been developed.
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Affiliation(s)
- Zhengjiang Fu
- College of Chemistry
- Nanchang University
- Nanchang
- China
| | - Zhaojie Li
- College of Chemistry
- Nanchang University
- Nanchang
- China
| | - Qiheng Xiong
- College of Chemistry
- Nanchang University
- Nanchang
- China
| | - Hu Cai
- College of Chemistry
- Nanchang University
- Nanchang
- China
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23
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Manley DW, Walton JC. A clean and selective radical homocoupling employing carboxylic acids with titania photoredox catalysis. Org Lett 2014; 16:5394-7. [PMID: 25290736 DOI: 10.1021/ol502625w] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A titania photoredox catalysis protocol was developed for the homocoupling of C-centered radicals derived from carboxylic acids. Intermolecular reactions were generally efficient and selective, furnishing the desired dimers in good yields under mild neutral conditions. Selective cross-coupling with two acids proved unsuccessful. An intramolecular adaptation enabled macrocycles to be prepared, albeit in modest yields.
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Affiliation(s)
- David W Manley
- University of St. Andrews , EaStCHEM School of Chemistry, St. Andrews, Fife, KY16 9ST, U.K
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24
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Wada M, Murata T, Oikawa H, Oguri H. Nickel-catalyzed dimerization of pyrrolidinoindoline scaffolds: systematic access to chimonanthines, folicanthines and (+)-WIN 64821. Org Biomol Chem 2014; 12:298-306. [DOI: 10.1039/c3ob41918e] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Peng Y, Luo L, Yan CS, Zhang JJ, Wang YW. Ni-Catalyzed Reductive Homocoupling of Unactivated Alkyl Bromides at Room Temperature and Its Synthetic Application. J Org Chem 2013; 78:10960-7. [DOI: 10.1021/jo401936v] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Yu Peng
- State Key
Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and
Resources Utilization of Gansu Province, and College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Long Luo
- State Key
Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and
Resources Utilization of Gansu Province, and College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Chang-Song Yan
- State Key
Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and
Resources Utilization of Gansu Province, and College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jian-Jian Zhang
- State Key
Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and
Resources Utilization of Gansu Province, and College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Ya-Wen Wang
- State Key
Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and
Resources Utilization of Gansu Province, and College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
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26
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2013. [DOI: 10.1016/s0040-4020(13)01252-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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28
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Symmetry-Driven Total Synthesis of Merrilactone A and Resolvin E2. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/b978-0-08-099362-1.00005-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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29
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Zhao L, Tsukano C, Kwon E, Takemoto Y, Hirama M. Total Syntheses of Complanadines A and B. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201208297] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Zhao L, Tsukano C, Kwon E, Takemoto Y, Hirama M. Total Syntheses of Complanadines A and B. Angew Chem Int Ed Engl 2012; 52:1722-5. [DOI: 10.1002/anie.201208297] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Indexed: 11/09/2022]
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31
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Zhao K, Cheng GJ, Yang H, Shang H, Zhang X, Wu YD, Tang Y. Total Synthesis of Incarvilleatone and Incarviditone: Insight into Their Biosynthetic Pathways and Structure Determination. Org Lett 2012; 14:4878-81. [DOI: 10.1021/ol302205w] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kun Zhao
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Gui-Juan Cheng
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Hongzhi Yang
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Hai Shang
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Xinhao Zhang
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Yun-Dong Wu
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Yefeng Tang
- The Comprehensive AIDS Research Center, Department of Pharmacology & Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China, and Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
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32
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O’Connell KMG, Díaz-Gavilán M, Galloway WRJD, Spring DR. Two-directional synthesis as a tool for diversity-oriented synthesis: Synthesis of alkaloid scaffolds. Beilstein J Org Chem 2012; 8:850-60. [PMID: 23015833 PMCID: PMC3388873 DOI: 10.3762/bjoc.8.95] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 05/14/2012] [Indexed: 11/23/2022] Open
Abstract
Two-directional synthesis represents an ideal strategy for the rapid elaboration of simple starting materials and their subsequent transformation into complex molecular architectures. As such, it is becoming recognised as an enabling technology for diversity-oriented synthesis. Herein, we provide a thorough account of our work combining two-directional synthesis with diversity-oriented synthesis, with particular reference to the synthesis of polycyclic alkaloid scaffolds.
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Affiliation(s)
- Kieron M G O’Connell
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
| | - Monica Díaz-Gavilán
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
| | - Warren R J D Galloway
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
| | - David R Spring
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
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33
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34
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2011. [DOI: 10.1016/s0040-4020(11)00770-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part X, 2005–2007. ADVANCES IN HETEROCYCLIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-385464-3.00001-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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36
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Glueck DS. Selectivity via catalyst or substrate control in catalytic asymmetric transformations of bifunctional symmetrical substrates. Catal Sci Technol 2011. [DOI: 10.1039/c1cy00048a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2010. [DOI: 10.1016/s0040-4020(10)01735-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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39
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Shen LL, Mun HS, Jeong JH. Macrocyclisation of Macrodiolide with Dimethylaluminium Methaneselenolate. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Yoon IH, Lee YH, Park CW, Ji HJ, Lee YS. Synthesis of Dimers of (4-Oxo-4H-pyran-2-yl)acrylic Acid as Tyrosinase Inhibitors. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.7.2036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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41
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Yamakoshi H, Shibuya M, Tomizawa M, Osada Y, Kanoh N, Iwabuchi Y. Total Synthesis and Determination of the Absolute Configuration of (−)-Idesolide. Org Lett 2010; 12:980-3. [DOI: 10.1021/ol9029676] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroyuki Yamakoshi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
| | - Masatoshi Shibuya
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
| | - Masaki Tomizawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
| | - Yuji Osada
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
| | - Naoki Kanoh
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
| | - Yoshiharu Iwabuchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
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42
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Cornella J, Lahlali H, Larrosa I. Decarboxylative homocoupling of (hetero)aromatic carboxylic acids. Chem Commun (Camb) 2010; 46:8276-8. [DOI: 10.1039/c0cc01943g] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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43
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44
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Hong BC, Liu KL, Tsai CW, Liao JH. Proline-mediated dimerization of cinnamaldehydes via 1,3-dipolar cycloaddition reaction with azomethine ylides. A rapid access to highly functionalized hexahydro-1H-pyrrolizine. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.07.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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45
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Tetrahedron reports on organic chemistry. Tetrahedron 2008. [DOI: 10.1016/s0040-4020(08)00897-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Alcaide B, Almendros P, Carrascosa R, Rodríguez-Acebes R. Synthesis of Novel Bis(β-lactam)-1,3-diynes by Copper-Promoted Homo- or Cross-Coupling of Alkynyl-2-azetidinones. European J Org Chem 2008. [DOI: 10.1002/ejoc.200701083] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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47
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Concellón J, Bernad P, del Solar V, García-Granda S, Díaz MR. Unusual Totally Selective Cyclodimerization of Epoxides: Synthesis of a Pair of Diastereoisomers of Enantiopure 2,5-Disubstituted-1,4-Dioxanes withC2 Symmetry. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700486] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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48
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Gung BW, Omollo AO. Total Synthesis of (+)- and (−)-Duryne: A Potent Anticancer Agent from the Marine Sponge Cribrochalina Dura. Establishment of the Central Double Bond Geometry and the Absolute Configuration of the Chiral Centers. J Org Chem 2008; 73:1067-70. [DOI: 10.1021/jo702399j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benjamin W. Gung
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056
| | - Ann O. Omollo
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056
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49
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Murai T, Nogawa S, Mutoh Y. Sequential Addition Reactions of Lithium Acetylides and Grignard Reagents to Selenoiminium Salts Leading to 2-Propynyl Tertiary Amines Bearing a Tetrasubstituted Carbon Center. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.2220] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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50
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Tetrahedron reports on organic chemistry. Tetrahedron 2007. [DOI: 10.1016/s0040-4020(07)01371-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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