1
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Hanada S, Yoshida M, Kigoshi H. Concise total synthesis of (-)-berkelic acid via regioselective spiroacetal/pyran formation. Chem Commun (Camb) 2024; 60:3331-3334. [PMID: 38439742 DOI: 10.1039/d4cc00166d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
We successfully developed (1) scalable synthesis of the triol segment and (2) regio- and stereoselective synthesis of the tetracyclic skeleton by tandem spiroacetal/pyran formation from a simpler alkyne precursor, resulting in the achievement of concise total synthesis of (-)-berkelic acid.
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Affiliation(s)
- Shogo Hanada
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, Japan.
- Chemical & Biological Technology Labs., Astellas Pharma Inc., Miyukigaoka 21, Tsukuba, Ibaraki 305-8585, Japan
| | - Masahito Yoshida
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, Japan.
- Department of Chemistry, Faculty of Pure and Applied Sciences, Japan
| | - Hideo Kigoshi
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, Japan.
- Department of Chemistry, Faculty of Pure and Applied Sciences, Japan
- Alliance for the Research on the Mediterranean and North Africa (ARENA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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2
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Cheng HG, Yang Z, Chen R, Cao L, Tong WY, Wei Q, Wang Q, Wu C, Qu S, Zhou Q. A Concise Total Synthesis of (-)-Berkelic Acid. Angew Chem Int Ed Engl 2021; 60:5141-5146. [PMID: 33252181 DOI: 10.1002/anie.202014660] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/27/2020] [Indexed: 12/19/2022]
Abstract
Reported here is a concise total synthesis of (-)-berkelic acid in eight linear steps. This synthesis features a Catellani reaction/oxa-Michael cascade for the construction of the isochroman scaffold, a one-pot deprotection/spiroacetalization operation for the formation of the tetracyclic core structure, and a late-stage Ni-catalyzed reductive coupling for the introduction of the lateral chain. Notably, four stereocenters are established from a single existing chiral center with excellent stereocontrol during the deprotection/spiroacetalization process. Stereocontrol of the intriguing deprotection/spiroacetalization process is supported by DFT calculations.
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Affiliation(s)
- Hong-Gang Cheng
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Zhenjie Yang
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Ruiming Chen
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Liming Cao
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Wen-Yan Tong
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Qiang Wei
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Qingqing Wang
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Chenggui Wu
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Shuanglin Qu
- College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Qianghui Zhou
- Sauvage Center for Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.,The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
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3
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Cheng H, Yang Z, Chen R, Cao L, Tong W, Wei Q, Wang Q, Wu C, Qu S, Zhou Q. A Concise Total Synthesis of (−)‐Berkelic Acid. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014660] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hong‐Gang Cheng
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Zhenjie Yang
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Ruiming Chen
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Liming Cao
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Wen‐Yan Tong
- College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China
| | - Qiang Wei
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Qingqing Wang
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Chenggui Wu
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
| | - Shuanglin Qu
- College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China
| | - Qianghui Zhou
- Sauvage Center for Molecular Sciences Engineering Research Center of Organosilicon Compounds & Materials (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China
- The Institute for Advanced Studies Wuhan University Wuhan 430072 China
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4
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Wang HH, Wang XD, Cao F, Gao WW, Ma SM, Li Z, Deng XM, Shi T, Wang Z. Application of palladium-catalyzed aryl C–H alkylation in total synthesis of (−)-berkelic acid. Org Chem Front 2021. [DOI: 10.1039/d0qo01003k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Total synthesis of the isochroman natural product (–)-berkelic acid.
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Affiliation(s)
- Hui-Hong Wang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | | | - Fei Cao
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Wei-Wei Gao
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Shu-Meng Ma
- School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- China
| | - Zhao Li
- School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- China
| | - Xue-Mei Deng
- School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- China
| | - Tao Shi
- School of Pharmacy
- Lanzhou University
- Lanzhou 730000
- China
| | - Zhen Wang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
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5
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Akkarasereenon K, Tangdenpaisal K, Ruchirawat S, Ploypradith P. Chemoselective acid-catalyzed [4 + 2]-cycloaddition reactions of ortho-quinone methides and styrenes/stilbenes/cinnamates. Org Biomol Chem 2020; 18:8854-8866. [DOI: 10.1039/d0ob01312a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Chemoselective [4 + 2]-cycloaddition reactions between o-QMs and different olefins—styrenes, stilbenes, and cinnamates—yielded distinct cycloadducts in moderate to good yields.
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Affiliation(s)
- Kornkamon Akkarasereenon
- Program in Chemical Sciences
- Chulabhorn Graduate Institute
- Chulabhorn Royal Academy
- Bangkok
- Thailand
| | | | - Somsak Ruchirawat
- Program in Chemical Sciences
- Chulabhorn Graduate Institute
- Chulabhorn Royal Academy
- Bangkok
- Thailand
| | - Poonsakdi Ploypradith
- Program in Chemical Sciences
- Chulabhorn Graduate Institute
- Chulabhorn Royal Academy
- Bangkok
- Thailand
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6
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Lu K, Chen Q, Xu XF, Meng Y, Lin J, Chen WM. Novel benzyl phenyl sulfide derivatives as antibacterial agents against methicillin-resistant Staphylococcus aureus. J Antibiot (Tokyo) 2019; 73:82-90. [DOI: 10.1038/s41429-019-0257-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/22/2019] [Accepted: 10/16/2019] [Indexed: 12/19/2022]
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7
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Palani V, Hugelshofer CL, Sarpong R. A Unified Strategy for the Enantiospecific Total Synthesis of Delavatine A and Formal Synthesis of Incarviatone A. J Am Chem Soc 2019; 141:14421-14432. [DOI: 10.1021/jacs.9b07693] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Vignesh Palani
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Cedric L. Hugelshofer
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
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8
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Bender CF, Paradise CL, Lynch VM, Yoshimoto FK, De Brabander JK. A biosynthetically inspired synthesis of (-)-berkelic acid and analogs. Tetrahedron 2018; 74:909-919. [PMID: 29867257 DOI: 10.1016/j.tet.2018.01.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We describe a complete account of our total synthesis and biological evaluation of (-)-berkelic acid and analogs. We delineate a synthetic strategy inspired by a potentially biomimetic union between the natural products spicifernin and pulvilloric acid. After defining optimal parameters, we executed a one-pot silver-mediated in situ dehydration of an isochroman lactol to methyl pulvillorate, the cycloisomerization of a spicifernin-like alkynol to the corresponding exocyclic enol ether, and a subsequent cycloaddition to deliver the tetracyclic core of berkelic acid. Our studies confirm that the original assigned berkelic acid structure is not stable and equilibrates into a mixture of 4 diastereomers, fully characterized by X-ray crystallography. In addition to berkelic acid, C22-epi-berkelic acid, and nor-berkelic acids, we synthesized C26-oxoberkelic acid analogs that were evaluated against human cancer cell lines. In contrast to data reported for natural berkelic acid, our synthetic material and analogs were found to be devoid of activity.
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Affiliation(s)
- Christopher F Bender
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Christopher L Paradise
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Vincent M Lynch
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Francis K Yoshimoto
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Jef K De Brabander
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
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9
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Chuc LT, Chen CS, Lo WS, Shen PC, Hsuan YC, Tsai HHG, Shieh FK, Hou DR. Long-Range Olefin Isomerization Catalyzed by Palladium(0) Nanoparticles. ACS OMEGA 2017; 2:698-711. [PMID: 31457465 PMCID: PMC6640945 DOI: 10.1021/acsomega.6b00509] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 02/14/2017] [Indexed: 06/10/2023]
Abstract
Long-range olefin isomerization of 2-alkenylbenzoic acid derivatives going through two to five sp3-carbon atoms to give (E)-alkenes was achieved with palladium(0) nanoparticles. The substrate scope of this reaction includes carboxylic acid, ester, and primary to tertiary amides and tolerates various substituents on the benzene ring. This isomerization reaction was catalyzed by recyclable Pd(0) nanoparticles, prepared in situ from PdCl2 and characterized by X-ray powder diffraction and scanning electron microscopy analyses. 1H NMR studies and kinetic modeling supported a stepwise process. This new process was applied to synthesize a natural dihydroisocoumarin with good efficiency.
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10
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Hu J, Bian M, Ding H. Recent application of oxa-Michael reaction in complex natural product synthesis. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.11.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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11
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Arto T, de Santa-María IS, Chiara MD, Fañanás FJ, Rodríguez F. Berkelic Acid: Straightforward Analogue Synthesis and Studies of Activity Against Selected Cancer Cell Lines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601194] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tamara Arto
- Instituto Universitario de Química Organometálica “Enrique Moles”; Universidad de Oviedo; Julián Clavería, 8 E-33006 Oviedo Spain
| | - Inés Sáenz de Santa-María
- Servicio de Otorrinolaringología; Hospital Universitario Central de Asturias; Instituto Universitario de Oncología del Principado de Asturias; Universidad de Oviedo; E-33006 Oviedo Spain
| | - María-Dolores Chiara
- Servicio de Otorrinolaringología; Hospital Universitario Central de Asturias; Instituto Universitario de Oncología del Principado de Asturias; Universidad de Oviedo; E-33006 Oviedo Spain
| | - Francisco J. Fañanás
- Instituto Universitario de Química Organometálica “Enrique Moles”; Universidad de Oviedo; Julián Clavería, 8 E-33006 Oviedo Spain
| | - Félix Rodríguez
- Instituto Universitario de Química Organometálica “Enrique Moles”; Universidad de Oviedo; Julián Clavería, 8 E-33006 Oviedo Spain
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12
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Wadsworth AD, Furkert DP, Brimble MA. Total synthesis of the macrocyclic N-Methyl enamides palmyrolide A and 2S-sanctolide A. J Org Chem 2014; 79:11179-93. [PMID: 25369466 DOI: 10.1021/jo502238r] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Full details of the total syntheses of the initially reported and revised structures of the neuroprotective agent palmyrolide A are reported. The key macrocyclization step was achieved using a sequential ring-closing metathesis/olefin isomerization reaction. Furthermore, the total synthesis of the related macrolide (2S)-sanctolide A is reported. The synthesis used key elements from the synthesis of palmyrolide A, including the RCM/olefin isomerization sequence. The synthetic work described herein serves to facilitate the assignment of stereochemistry of the natural product sanctolide A and demonstrates the utility of this approach for the synthesis of macrocyclic tertiary enamide natural products.
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Affiliation(s)
- Andrew D Wadsworth
- Maurice Wilkins Centre for Molecular Biodiscovery, School of Chemical Sciences, University of Auckland , 23 Symonds Street, Auckland 1142, New Zealand
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13
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Majumdar KC, Sinha B. Coinage metals (Cu, Ag and Au) in the synthesis of natural products. RSC Adv 2014. [DOI: 10.1039/c3ra44336a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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14
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Synthesis of 5,6- and 6,6-Spirocyclic Compounds. SYNTHESIS OF SATURATED OXYGENATED HETEROCYCLES I 2014. [DOI: 10.1007/978-3-642-41473-2_5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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15
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Affiliation(s)
- Jin-Ming Gao
- Shaanxi Engineering Center of Bioresource Chemistry & Sustainable Utilization, Department of Chemistry and Chemical Engineering, College of Science, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China.
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16
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Affiliation(s)
- Hélène Pellissier
- Aix-Marseille Université, UMR CNRS 7313 Institut des Sciences Moléculaires de Marseille Equipe Chirosciences, Case 561, Campus Saint Jérôme Avenue Esc. Normandie-Niemen, 13397 Marseille Cedex 20, France
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17
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Karmakar R, Mal D. Total Synthesis of Chlorocyclinone A, a PPAR-γ Antagonist. J Org Chem 2012; 77:10235-48. [DOI: 10.1021/jo301712b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raju Karmakar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Dipakranjan Mal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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18
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Scalable Total Synthesis of (−)-Berkelic Acid by Using a Protecting-Group-Free Strategy. Angew Chem Int Ed Engl 2012; 51:4930-3. [DOI: 10.1002/anie.201109076] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Indexed: 01/25/2023]
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19
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Fañanás FJ, Mendoza A, Arto T, Temelli B, Rodríguez F. Scalable Total Synthesis of (−)-Berkelic Acid by Using a Protecting-Group-Free Strategy. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201109076] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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20
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Fuwa H. Total Synthesis of Tetrahydropyran-Containing Natural Products Exploiting Intramolecular Oxa-Conjugate Cyclization. HETEROCYCLES 2012. [DOI: 10.3987/rev-12-730] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Affiliation(s)
- Carl F Nising
- Bayer Pharma AG, Aprather Weg 18a, D-42113 Wuppertal, Germany.
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22
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Kueh JTB, Choi KW, Brimble MA. Enantioselective synthesis of C-linked spiroacetal-triazoles as privileged natural product-like scaffolds. Org Biomol Chem 2012; 10:5993-6002. [DOI: 10.1039/c2ob06802h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Fuwa H, Ichinokawa N, Noto K, Sasaki M. Stereoselective Synthesis of 2,6-Cis-Substituted Tetrahydropyrans: Brønsted Acid-Catalyzed Intramolecular Oxa-Conjugate Cyclization of α,β-Unsaturated Ester Surrogates. J Org Chem 2011; 77:2588-607. [DOI: 10.1021/jo202179s] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Haruhiko Fuwa
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Naoki Ichinokawa
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Kenkichi Noto
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Makoto Sasaki
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
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24
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McLeod MC, Wilson ZE, Brimble MA. Formal Synthesis of Berkelic Acid: A Lesson in α-Alkylation Chemistry. J Org Chem 2011; 77:400-16. [DOI: 10.1021/jo201988m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Michael C. McLeod
- School of Chemical
Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Zoe E. Wilson
- School of Chemical
Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Margaret A. Brimble
- School of Chemical
Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
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25
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McLeod MC, Wilson ZE, Brimble MA. An Enantioselective Formal Synthesis of Berkelic Acid. Org Lett 2011; 13:5382-5. [DOI: 10.1021/ol202265g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Michael C. McLeod
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Zoe E. Wilson
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
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26
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Wilson ZE, Hubert JG, Brimble MA. A Flexible Approach to 6,5-Benzannulated Spiroketals. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100345] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Chintareddy VR, Ellern A, Verkade JG. P[N(i-Bu)CH(2)CH(2)](3)N: nonionic Lewis base for promoting the room-temperature synthesis of α,β-unsaturated esters, fluorides, ketones, and nitriles using Wadsworth-Emmons phosphonates. J Org Chem 2011; 75:7166-74. [PMID: 20945858 DOI: 10.1021/jo1012515] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The bicyclic triaminophosphine P(RNCH(2)CH(2))(3)N (R = i-Bu, 1c) serves as an effective promoter for the room-temperature stereoselective synthesis of α,β-unsaturated esters, fluorides, and nitriles from a wide array of aromatic, aliphatic, heterocyclic, and cyclic aldehydes and ketones, using a range of Wadsworth-Emmons (WE) phosphonates. Among the analogues of 1c [R = Me (1a), i-Pr (1b), Bn (1d)], 1a and 1b performed well, although longer reaction times were involved, and 1d led to poorer yields than 1c. Functionalities such as cyano, chloro, bromo, methoxy, amino, ester, and nitro were well tolerated. We were able to isolate and characterize (by X-ray means; see above) the reactive WE intermediate species formed from 2b and 1c.
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28
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Méndez-Ardoy A, Suárez-Pereira E, Balbuena Oliva P, Jiménez Blanco JL, Ortiz Mellet C, García Fernández JM. Stereoselective Synthesis of Difructose Dianhydrides by Use of the Xylylene Group as Stereodirecting Element in Spiroketalisation Reactions. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000946] [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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29
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Snaddon TN, Buchgraber P, Schulthoff S, Wirtz C, Mynott R, Fürstner A. Total Synthesis of Berkelic Acid. Chemistry 2010; 16:12133-40. [DOI: 10.1002/chem.201001133] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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