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Jin Y, Li M, Chen Y, Li J, Wu W, Jiang H. Synthesis of Dienamides via Palladium-catalyzed Oxidative N-α,β-Dehydrogenation of Amides. Org Lett 2024; 26:4218-4223. [PMID: 38747898 DOI: 10.1021/acs.orglett.4c01052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Enamides and their derivatives are prominent bioactive pharmacophores found in various bioactive molecules. Herein we report a palladium-catalyzed oxidative N-α,β-dehydrogenation of amides to produce a range of enamides with high yields and excellent tolerance toward different functional groups. Mechanistic studies indicate that the reaction involves allylic C(sp3)-H activation followed by β-H elimination. The effectiveness of this approach is demonstrated through late-stage functionalization of bioactive molecules and the synthesis of valuable compounds through product elaboration.
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Affiliation(s)
- Yangbin Jin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Mingda Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Yupeng Chen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Jiarui Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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2
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Woo S, Landwehr EM, Shenvi RA. Synthesis of psychotropic alkaloids from Galbulimima. Tetrahedron 2022; 126:133064. [PMID: 37807979 PMCID: PMC10552879 DOI: 10.1016/j.tet.2022.133064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Efficient syntheses of valuable natural products open gateways from kind learning environments to wicked worlds, where long-term, interdisciplinary research questions can be asked and answered. In this Perspective, we discuss the Galbulimima (GB) alkaloids, metabolites of a rainforest canopy tree that exhibit potent but poorly understood effects in humans, including accounts of hallucination. Recent syntheses from our group have opened up GB alkaloid chemical space for investigation by way of new cross-coupling reactions and gram-scale target production. Although natural product synthesis can be challenging, its objective is obvious. Realization of long-term, enabling goals will be a circuitous journey at the interface of chemistry, pharmacology and neuroscience-a potent mix to foster discovery in the coming century.
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Affiliation(s)
- Stone Woo
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
- Skaggs Graduate School of Chemical and Biological Sciences, Scripps Research, La Jolla, California 92037, United States
| | - Eleanor M. Landwehr
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
- Skaggs Graduate School of Chemical and Biological Sciences, Scripps Research, La Jolla, California 92037, United States
| | - Ryan A. Shenvi
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
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3
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Heravi MM, Nazari A. Samarium(ii) iodide-mediated reactions applied to natural product total synthesis. RSC Adv 2022; 12:9944-9994. [PMID: 35424959 PMCID: PMC8965710 DOI: 10.1039/d1ra08163b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 03/12/2022] [Indexed: 12/22/2022] Open
Abstract
Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated. Due to the demanding structures and complex functionality of many natural products, only powerful and selective methods and reagents will be highlighted in this proceeding. Since its introduction by Henri Kagan, samarium(ii) iodide (SmI2, Kagan's reagent) has found increasing use in chemical synthesis. Over the years, many reviews have been published on the application of SmI2 in numerous reductive coupling procedures as well as in natural product total synthesis. This review highlights recent advances in SmI2-mediated synthetic strategies, as applied in the total synthesis of natural products since 2004. Natural product synthesis remains a field in which new synthetic methods and reagents are continually being evaluated.![]()
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Affiliation(s)
- Majid M Heravi
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
| | - Azadeh Nazari
- Department of Chemistry, School of Science, Alzahra University PO Box 1993891176 Vanak Tehran Iran +98 21 88041344 +98 21 88044051
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4
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Landwehr EM, Baker MA, Oguma T, Burdge HE, Kawajiri T, Shenvi RA. Concise syntheses of GB22, GB13, and himgaline by cross-coupling and complete reduction. Science 2022; 375:1270-1274. [PMID: 35298242 PMCID: PMC10036211 DOI: 10.1126/science.abn8343] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Neuroactive metabolites from the bark of Galbulimima belgraveana occur in variable distributions among trees and are not easily accessible through chemical synthesis because of elaborate bond networks and dense stereochemistry. Previous syntheses of complex congeners such as himgaline have relied on iterative, stepwise installation of multiple methine stereocenters. We decreased the synthetic burden of himgaline chemical space to nearly one-third of the prior best (7 to 9 versus 19 to 31 steps) by cross-coupling high fraction aromatic building blocks (high Fsp2) followed by complete, stereoselective reduction to high fraction sp3 products (high Fsp3). This short entry into Galbulimima alkaloid space should facilitate extensive chemical exploration and biological interrogation.
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Affiliation(s)
| | - Meghan A. Baker
- Department of Chemistry, Scripps Research, La Jolla, United States
| | - Takuya Oguma
- Department of Chemistry, Scripps Research, La Jolla, United States
| | - Hannah E. Burdge
- Department of Chemistry, Scripps Research, La Jolla, United States
| | | | - Ryan A. Shenvi
- Department of Chemistry, Scripps Research, La Jolla, United States
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5
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Chaudhary NK, Taylor WC, Mander LN, Karuso P. Isolation and Structure Elucidation of Additional Alkaloids from the Tropical Rainforest Tree Galbulimima baccata. JOURNAL OF NATURAL PRODUCTS 2021; 84:2525-2535. [PMID: 34491059 DOI: 10.1021/acs.jnatprod.1c00537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The structures of five new natural products (GB 27-GB 31, 1-5), isolated as minor components from the bark of Galbulimima baccata, have been determined by 2D NMR spectroscopy in combination with DFT calculations. Among the alkaloids, GB 31 (5) belongs to Class I, GB 27 (1) and 28 (2) belong to Class II, and GB 30 (4) belongs to Class III GB alkaloids. GB 31 is the first non-nitrogen-containing GB "alkaloid", being a biosynthetic oxidation product of himbacine, himandravine, or himbeline. GB 29 (3) has an entirely new natural product scaffold but belongs to Class IV (miscellaneous alkaloids). The isolation of a new Galbulimima scaffold has revealed a new pathway in the biosynthesis of the GB alkaloids. The new molecules isolated have shed further light on the biogenetic relationship among these structurally unique and complex groups of alkaloids. We present, for the first time, a unified biogenesis for the GB alkaloids that were first isolated in the 1950s and now number over 40 examples. This work also brings full circle the story of Galbulimima alkaloids. A life-long project of Wal Taylor involving one of his first students (Lew Mander) and one of his last students (Peter Karuso), a story stretching over six decades, has come to a final conclusion.
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Affiliation(s)
- Nirmal K Chaudhary
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Walter C Taylor
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Lewis N Mander
- Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia
| | - Peter Karuso
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
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6
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Abstract
The field of total synthesis has reached a stage in which emphasis has been increasingly focused on synthetic efficiency rather than merely achieving the synthesis of a target molecule. The pursuit of synthetic efficiency, typically represented by step count and overall yield, is a rich source of inspiration and motivation for synthetic chemists to invent innovative strategies and methods. Among them, convergent strategy has been well recognized as an effective approach to improve efficiency. This strategy generally involves coupling of fragments with similar complexity to furnish the target molecule via subsequent cyclization or late-stage functionalization. Thus, methodologies that enable effective connection of fragments are critical to devising a convergent plan. In our laboratory, convergent strategy has served as a long-standing principle for pursuing efficient synthesis during the course of planning and implementing synthetic projects. In this Account, we summarize our endeavors in the convergent synthesis of natural products over the last ten years. We show how we identify reasonable bond disconnections and employ enabling synthetic methodologies to maximize convergency, leading to the efficient syntheses of over two-dozen highly complex molecules from eight disparate families.In detail, we categorize our work into three parts based on the diverse reaction types for fragment assembly. First, we demonstrate the application of a powerful single-electron reducing agent, SmI2, in a late-stage cyclization step, forging the polycyclic skeletons of structurally fascinating Galbulimima alkaloids and Leucosceptrum sesterterpenoids. Next, we showcase how three different types of cycloaddition reactions can simultaneously construct two challenging C-C bonds in a single step, providing concise entries to three distinct families, namely, spiroquinazoline alkaloids, gracilamine, and kaurane diterpenoids. In the third part, we describe convergent assembly of ent-kaurane diterpenoids, gelsedine-type alkaloids, and several drug molecules via employing some bifunctional synthons. To access highly oxidized ent-kaurane diterpenoids, we introduce the hallmark bicyclo[3.2.1]octane ring system at an early stage, and then execute coupling and cyclization by means of a Hoppe's homoaldol reaction and a Mukaiyama-Michael-type addition, respectively. Furthermore, we showcase how the orchestrated combination of an asymmetric Michael addition, a tandem oxidation-aldol reaction and a pinacol rearrangement can dramatically improve the efficiency in synthesizing gelsedine-type alkaloids, with nary a protecting group. Finally, to address the supply issue of several drugs, including anti-influenza drug zanamivir and antitumor agent Et-743, we exploit scalable and practical approaches to provide advantages over current routes in terms of cost, ease of execution, and efficiency.
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Affiliation(s)
- Yang Gao
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
| | - Dawei Ma
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China
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7
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Wang B, Perea MA, Sarpong R. Transition Metal-Mediated C-C Single Bond Cleavage: Making the Cut in Total Synthesis. Angew Chem Int Ed Engl 2020; 59:18898-18919. [PMID: 31984640 PMCID: PMC7772057 DOI: 10.1002/anie.201915657] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Indexed: 12/12/2022]
Abstract
Transition-metal-mediated cleavage of C-C single bonds can enable entirely new retrosynthetic disconnections in the total synthesis of natural products. Given that C-C bond cleavage inherently alters the carbon framework of a compound, and that, under transition-metal catalysis, the generated organometallic or radical intermediate is primed for further complexity-building reactivity, C-C bond-cleavage events have the potential to drastically and rapidly remodel skeletal frameworks. The recent acceleration of the use of transition-metal-mediated cleavage of C-C single bonds in total synthesis can be ascribed to a communal recognition of this fact. In this Review, we highlight ten selected total syntheses from 2014 to 2019 that illustrate how transition-metal-mediated cleavage of C-C single bonds at either the core or the periphery of synthetic intermediates can streamline synthetic efforts.
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Affiliation(s)
| | | | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley Berkeley, CA 94720 (USA)
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8
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Wang B, Perea MA, Sarpong R. Übergangsmetallvermittelte Spaltung von C‐C‐Einfachbindungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915657] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Brian Wang
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Melecio A. Perea
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
| | - Richmond Sarpong
- Department of Chemistry University of California, Berkeley Berkeley CA 94720 USA
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9
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Chen H, Liu L, Huang T, Chen J, Chen T. Direct Dehydrogenation for the Synthesis of α,β‐Unsaturated Carbonyl Compounds. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000454] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hong Chen
- Haikou Hospital affiliated to Xiangya School of MedicineCentral South University Haikou 570100 People's Republic of China
| | - Long Liu
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island ResourcesHainan Provincial Key Lab of Fine ChemHainan University Haikou 570228 People's Republic of China
| | - Tianzeng Huang
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island ResourcesHainan Provincial Key Lab of Fine ChemHainan University Haikou 570228 People's Republic of China
| | - Jing Chen
- Haikou Hospital affiliated to Xiangya School of MedicineCentral South University Haikou 570100 People's Republic of China
| | - Tieqiao Chen
- Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island ResourcesHainan Provincial Key Lab of Fine ChemHainan University Haikou 570228 People's Republic of China
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10
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Bonjoch J, Diaba F. Radical Reactions in Alkaloid Synthesis: A Perspective from Carbon Radical Precursors. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000391] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Josep Bonjoch
- Laboratori de Química Orgànica Facultat de Farmàcia, IBUB Universitat de Barcelona Av. Joan XXIII s/n 08028 Barcelona Spain
| | - Faiza Diaba
- Laboratori de Química Orgànica Facultat de Farmàcia, IBUB Universitat de Barcelona Av. Joan XXIII s/n 08028 Barcelona Spain
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11
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Lan P, Herlt AJ, Willis AC, Taylor WC, Mander LN. Structures of New Alkaloids from Rain Forest Trees Galbulimima belgraveana and Galbulimima baccata in Papua New Guinea, Indonesia, and Northern Australia. ACS OMEGA 2018; 3:1912-1921. [PMID: 31458503 PMCID: PMC6641496 DOI: 10.1021/acsomega.7b02065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 01/31/2018] [Indexed: 06/10/2023]
Abstract
Following on our 60-year research on the chemical constituents of the rain forest trees Galbulimima belgraveana and Galbulimima baccata, we report the isolation of seven new alkaloids: GB14 (14), GB22 (15), GB25 (16), GB21 (17), GB23 (18), GB24 (19), and GB26 (20). Their structures were elucidated by a combination of spectroscopic analyses and single-crystal X-ray crystallography, as well as structure degradation and interconversion. The newly isolated alkaloids are precursors or derivatives of the known family members from our early studies and could be intermediates in the biosynthesis of the Galbulimima alkaloids. Therefore, the present study has expanded the range of structures in this family of alkaloids and provided some missing links in the biosynthetic sequences.
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Affiliation(s)
- Ping Lan
- Department
of Food Science and Engineering, Jinan University, Guangzhou 510632, China
| | - Anthony J. Herlt
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
| | - Anthony C. Willis
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
| | - Walter C. Taylor
- School
of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Lewis N. Mander
- Research
School of Chemistry, Australian National
University, Canberra, Australian Capital Territory 2601, Australia
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12
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Yan Y, An Y, Wang X, Chen Y, Jacob MR, Tekwani BL, Dai L, Li XC. Synthesis and Antimicrobial Evaluation of Fire Ant Venom Alkaloid Based 2-Methyl-6-alkyl-Δ 1,6-piperideines. JOURNAL OF NATURAL PRODUCTS 2017; 80:2795-2798. [PMID: 29023124 DOI: 10.1021/acs.jnatprod.7b00625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The first synthesis of 2-methyl-6-pentadecyl-Δ1,6-piperideine (1), a major alkaloid of the piperideine chemotype in fire ant venoms, and its analogues, 2-methyl-6-tetradecyl-Δ1,6-piperideine (2) and 2-methyl-6-hexadecyl-Δ1,6-piperideine (3), was achieved by a facile synthetic method starting with glutaric acid (4) and urea (5). Compound 1 showed in vitro antifungal activity against Cryptococcus neoformans and Candida albicans with IC50 values of 6.6 and 12.4 μg/mL, respectively, and antibacterial activity against vancomycin-resistant Enterococcus faecium with an IC50 value of 19.4 μg/mL, while compounds 2 and 3 were less active against these pathogens. All three compounds strongly inhibited the parasites Leishmania donovani promastigotes and Trypanosoma brucei with IC50 values in the range of 5.0-6.7 and 2.7-4.0 μg/mL, respectively.
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Affiliation(s)
- Yujie Yan
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, People's Republic of China
| | - Yu An
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, People's Republic of China
| | - Xiaozhong Wang
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, People's Republic of China
| | - Yingqi Chen
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, People's Republic of China
| | - Melissa R Jacob
- National Centers for Natural Products Research, Research Institute of Pharmaceutical Sciences, The University of Mississippi , University, Mississippi 38677, United States
| | - Babu L Tekwani
- National Centers for Natural Products Research, Research Institute of Pharmaceutical Sciences, The University of Mississippi , University, Mississippi 38677, United States
| | - Liyan Dai
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University , Hangzhou 310027, People's Republic of China
| | - Xing-Cong Li
- National Centers for Natural Products Research, Research Institute of Pharmaceutical Sciences, The University of Mississippi , University, Mississippi 38677, United States
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13
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Abstract
This chapter provides a comprehensive overview of recent achievements in the area of Galbulimima alkaloids. Following a discussion of the isolation of Galbulimima alkaloids and structural features of members of this fascinating family of secondary metabolites, biological properties of selected compounds are briefly discussed. Furthermore, the proposed biosynthetic routes toward Galbulimima alkaloids are outlined. The main section of the chapter is devoted to a detailed discussion and comparison of all total syntheses of Galbulimima alkaloids published to date.
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Affiliation(s)
- Uwe Rinner
- Sultan Qaboos University, Al-Khoud, Sultanate of Oman.
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14
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15
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Syu JF, Wang YT, Liu KC, Wu PY, Henschke JP, Wu HL. Rh(I)-Catalyzed 1,4-Conjugate Addition of Alkenylboronic Acids to a Cyclopentenone Useful for the Synthesis of Prostaglandins. J Org Chem 2016; 81:10832-10844. [DOI: 10.1021/acs.joc.6b01913] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jin-Fong Syu
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road, Taipei, Taiwan 11677, Republic of China
| | - Yun-Ting Wang
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road, Taipei, Taiwan 11677, Republic of China
| | - Kung-Cheng Liu
- ScinoPharm Taiwan, Ltd. No. 1, Nan-Ke
eighth Road, Southern Taiwan Science Park, Shan-Hua, Tainan, Taiwan 74144, Republic of China
| | - Ping-Yu Wu
- ScinoPharm Taiwan, Ltd. No. 1, Nan-Ke
eighth Road, Southern Taiwan Science Park, Shan-Hua, Tainan, Taiwan 74144, Republic of China
| | - Julian P. Henschke
- ScinoPharm Taiwan, Ltd. No. 1, Nan-Ke
eighth Road, Southern Taiwan Science Park, Shan-Hua, Tainan, Taiwan 74144, Republic of China
| | - Hsyueh-Liang Wu
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, No. 88, Section 4, Tingzhou Road, Taipei, Taiwan 11677, Republic of China
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16
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Mailyan AK, Eickhoff JA, Minakova AS, Gu Z, Lu P, Zakarian A. Cutting-Edge and Time-Honored Strategies for Stereoselective Construction of C–N Bonds in Total Synthesis. Chem Rev 2016; 116:4441-557. [DOI: 10.1021/acs.chemrev.5b00712] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Artur K. Mailyan
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - John A. Eickhoff
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Anastasiia S. Minakova
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Zhenhua Gu
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Ping Lu
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Armen Zakarian
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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17
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Larson RT, Pemberton RP, Franke JM, Tantillo DJ, Thomson RJ. Total Synthesis of the Galbulimima Alkaloids Himandravine and GB17 Using Biomimetic Diels-Alder Reactions of Double Diene Precursors. J Am Chem Soc 2015; 137:11197-204. [PMID: 26305231 PMCID: PMC4612511 DOI: 10.1021/jacs.5b07710] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The enantioselective total syntheses of himandravine and GB17 were completed through a common biomimetic strategy involving Diels-Alder reactions of unusual double diene containing linear precursors. The double diene precursors, containing or lacking a C12 substituent as required to produce GB17 or himandravine, respectively, were found to undergo Diels-Alder reactions to afford mixtures of regioisomeric cycloadducts that map onto the alternative carbocyclic frameworks of both himandravine and GB17. Computational investigations revealed that these Diels-Alder reactions proceed via transition state structures of similar energy that have a high degree of bispericyclic character and that the low levels of regioselectivity observed in the reactions are a consequence of competing orbital interaction and distortion energies. The combined experimental and computational results provide valuable insights into the biosynthesis of the Galbulimima alkaloids.
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Affiliation(s)
- Reed T. Larson
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Ryan P. Pemberton
- Department of Chemistry, University of California—Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Jenna M. Franke
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Dean J. Tantillo
- Department of Chemistry, University of California—Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Regan J. Thomson
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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18
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Liu F, Movassaghi M. Electrophilic Carbonyl Activation: Competing Condensative Cyclizations of Tryptamine Derivatives. Tetrahedron Lett 2015; 56:2995-3000. [PMID: 26120209 DOI: 10.1016/j.tetlet.2014.09.022] [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] [Indexed: 12/28/2022]
Abstract
A series of tryptamine derived bisindole substrates were subject to electrophilic activation of the functional grouping at their alpha-nitrogen in the form of iminium ions to enable cyclization onto the sterically hindered indole substructure. Our observations regarding divergent cyclization outcomes using electronically distinct bisindole substrates are described. Surprising preference for Friedel-Crafts alkylation reaction and evidence for an intriguing reversible spirocyclization are discussed.
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Affiliation(s)
- Fan Liu
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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19
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Fang LC, Hsung RP, Ma ZX, Presser WR. A highly stereoselective Diels-Alder cycloaddition of enones with chiral cyclic 2-amidodienes derived from allenamides. Org Lett 2013; 15:4842-5. [PMID: 24001055 DOI: 10.1021/ol402254p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Lewis acid promoted Diels-Alder cycloadditions of a series of de novo chiral cyclic 2-amidodienes are described. These cyclic 2-amidodienes are derived from chiral α-allyl allenamides via a sequence of E-selective 1,3-H shift and 6π-electron pericyclic ring closure. With enones serving as effective dienophiles, these cycloadditions can be highly diastereoselective depending upon the chiral amide substituent, thereby representing a facile entry to optically enriched [2.2.2]bicyclic manifolds.
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Affiliation(s)
- Li-Chao Fang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin , Madison, Wisconsin 53705, United States
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20
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Evano G, Theunissen C, Pradal A. Impact of copper-catalyzed cross-coupling reactions in natural product synthesis: the emergence of new retrosynthetic paradigms. Nat Prod Rep 2013; 30:1467-89. [DOI: 10.1039/c3np70071b] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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21
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22
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de Miguel I, Herradón B, Mann E. Intramolecular Azide-Alkene 1,3-Dipolar Cycloaddition/Enamine Addition(s) Cascade Reaction: Synthesis of Nitrogen-Containing Heterocycles. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200071] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Evans DA, Adams DJ, Kwan EE. Progress toward the Syntheses of (+)-GB 13, (+)-Himgaline, and Himandridine. New Insights into Intramolecular Imine/Enamine Aldol Cyclizations. J Am Chem Soc 2012; 134:8162-70. [DOI: 10.1021/ja3001776] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- David A. Evans
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Drew J. Adams
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Eugene E. Kwan
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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24
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Larson RT, Clift MD, Thomson RJ. Total Synthesis of the Galbulimima Alkaloid (−)-GB17. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108227] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Larson RT, Clift MD, Thomson RJ. Total synthesis of the Galbulimima alkaloid (-)-GB17. Angew Chem Int Ed Engl 2012; 51:2481-4. [PMID: 22287499 DOI: 10.1002/anie.201108227] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Reed T Larson
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA
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26
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De Paolis M, Chataigner I, Maddaluno J. Recent advances in stereoselective synthesis of 1,3-dienes. Top Curr Chem (Cham) 2012; 327:87-146. [PMID: 22527407 DOI: 10.1007/128_2012_320] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The aim of this review is to present the latest developments in the stereoselective synthesis of conjugated dienes, covering the period 2005-2010. Since the use of this class of compounds is linked to the nature of their appendages (aryls, alkyls, electron-withdrawing, and heterosubstituted groups), the review has been categorized accordingly and illustrates the most representative strategies and mechanisms to access these targets.
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27
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Fischer D, Nguyen TX, Trzoss L, Dakanali M, Theodorakis EA. Intramolecular Cyclization Strategies Toward the Synthesis of Zoanthamine Alkaloids. Tetrahedron Lett 2011; 52:4920-4923. [PMID: 21857757 DOI: 10.1016/j.tetlet.2011.07.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Stabilized 2-amino-1,3-dienes can participate in intramolecular Diels-Alder (IMDA) reactions with pendant dienophiles. We found that these dienes can be readily prepared via standard palladium-mediated coupling reactions and have comparable reactivity to 2-oxodienes. Application of these substrates to the synthesis of tetracyclic model systems representing the ABCE motif of the zoanthamines is presented.
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Affiliation(s)
- Derek Fischer
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
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28
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Trzoss L, Xu J, Lacoske MH, Mobley WC, Theodorakis EA. Enantioselective synthesis of (-)-jiadifenin, a potent neurotrophic modulator. Org Lett 2011; 13:4554-7. [PMID: 21812392 DOI: 10.1021/ol201742j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first enantioselective synthesis of (-)-jiadifenin (1), a potent neurite outgrowth promoter isolated from the Illicium species, is described. The synthetic strategy builds upon bicyclic motif 6, which represents the AB ring of the natural product and proceeds in 19 steps and 1.1% overall yield. Key to our approach is a Mn(III)-mediated oxidation reaction of A ring that, following a regio- and diastereoselective α-hydroxylation and methylation sequence, produces the desired functionalities of (-)-jiadifenin. The effect of synthetic 1 in NGF-mediated neurite outgrowth was also measured in PC-12 cells.
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Affiliation(s)
- Lynnie Trzoss
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA
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29
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30
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Hayashi R, Feltenberger JB, Lohse AG, Walton MC, Hsung RP. An efficient and practical entry to 2-amido-dienes and 3-amido-trienes from allenamides through stereoselective 1,3-hydrogen shifts. Beilstein J Org Chem 2011; 7:410-20. [PMID: 21512601 PMCID: PMC3079123 DOI: 10.3762/bjoc.7.53] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Accepted: 03/16/2011] [Indexed: 12/16/2022] Open
Abstract
Preparations of de novo acyclic 2-amido-dienes and 3-amido-trienes through 1,3-hydrogen shifts from allenamides are described. These 1,3-hydrogen shifts could be achieved thermally or they could be promoted by the use of Brønsted acids. Under either condition, these processes are highly regioselective in favour of the α-position, and highly stereoselective in favour of the E-configuration. In addition, 6π-electron electrocyclic ring-closure could be carried out with 3-amido-trienes to afford cyclic 2-amido-dienes, and such electrocyclic ring-closure could be rendered in tandem with the 1,3-hydrogen shift.
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Affiliation(s)
- Ryuji Hayashi
- Department of Chemistry and Division of Pharmaceutical Sciences, University of Wisconsin, Madison, WI 53705
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31
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Kawai N, Abe R, Matsuda M, Uenishi J. Synthesis of Chiral 1-Substituted Tetrahydroisoquinolines by the Intramolecular 1,3-Chirality Transfer Reaction Catalyzed by Bi(OTf)3. J Org Chem 2011; 76:2102-14. [DOI: 10.1021/jo102452d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nobuyuki Kawai
- Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8412, Japan
| | - Ryuzou Abe
- Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8412, Japan
| | - Mika Matsuda
- Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8412, Japan
| | - Jun’ichi Uenishi
- Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8412, Japan
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32
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Duschek A, Kirsch SF. 2-Iodoxybenzoic Acid-A Simple Oxidant with a Dazzling Array of Potential Applications. Angew Chem Int Ed Engl 2011; 50:1524-52. [DOI: 10.1002/anie.201000873] [Citation(s) in RCA: 205] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Indexed: 12/26/2022]
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33
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Duschek A, Kirsch SF. 2-Iodoxybenzoesäure - ein einfaches Oxidationsmittel mit einer Vielfalt an Anwendungsmöglichkeiten. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201000873] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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34
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Bradford TA, Willis AC, White JM, Herlt AJ, Taylor WC, Mander LN. The structures of four new himbacine-like Galbulimima alkaloids. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2010.10.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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35
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Zi W, Yu S, Ma D. A convergent route to the Galbulimima alkaloids (-)-GB 13 and (+)-GB 16. Angew Chem Int Ed Engl 2010; 49:5887-90. [PMID: 20629004 DOI: 10.1002/anie.201002299] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Weiwei Zi
- State Key Laboratory of Bioorganic & Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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36
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Zi W, Yu S, Ma D. Synthetic Studies toward Galbulimima Alkaloid (−)-GB 13 and (+)-GB 16 and (−)-Himgaline. Chem Asian J 2010; 6:573-9. [DOI: 10.1002/asia.201000556] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Indexed: 11/11/2022]
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37
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Legrand F, Jouvin K, Evano G. Vinyl Dibromides: Versatile Partners in Cross-Coupling Reactions. Isr J Chem 2010. [DOI: 10.1002/ijch.201000037] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Zi W, Yu S, Ma D. A Convergent Route to the Galbulimima Alkaloids (−)-GB 13 and (+)-GB 16. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002299] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Larson KK, Sarpong R. Total synthesis of alkaloid (+/-)-G. B. 13 using a Rh(I)-catalyzed ketone hydroarylation and late-stage pyridine reduction. J Am Chem Soc 2010; 131:13244-5. [PMID: 19754185 DOI: 10.1021/ja9063487] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Total synthesis of the Galbulimima alkaloid G. B. 13 was achieved utilizing a functionalized pyridine moiety as a piperidine surrogate. Key to the success of the synthesis was the development of an unprecedented rhodium-catalyzed 1,2-addition of an arylboronic ester into an unactivated ketone.
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Affiliation(s)
- Kimberly K Larson
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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40
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Abstract
The utility of copper-mediated cross-coupling reactions has been significantly increased by the development of mild reaction conditions and the ability to employ catalytic amounts of copper. The use of diamine-based ligands has been important in these advances and in this review we discuss these systems, including the choice of reaction conditions and applications in the synthesis of pharmaceuticals, natural products and designed materials.
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Affiliation(s)
- David S Surry
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. ; Tel: +1-617-253-1885
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41
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O'Connor PD, Del Signore G, McLachlan MMW, Willis AC, Mander LN. Approaches to the Synthesis of the Galbulimima Alkaloid Himandrine. Aust J Chem 2010. [DOI: 10.1071/ch10252] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The hexacyclic skeleton of himandrine (2), which is present in 15 of the more complex alkaloids obtained from the bark of the tropical rain forest tree Galbulimima belgraveana has been prepared by means of a 19-step synthesis beginning with the known [3.2.1]-benzobicyclooctene intermediate 9. An alternative approach is also described, thus far culminating in 34. Key transformations include Diels–Alder cycloadditions, ring contractions, a Curtius rearrangement, a Birch reduction, an intramolecular nucleophilic amination, and a palladium-mediated alkene amination.
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42
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McLachlan MMW, O'Connor PD, Fairweather KA, Willis AC, Mander LN. Total Synthesis of the Galbulimima Alkaloid (±)-GB 13. Aust J Chem 2010. [DOI: 10.1071/ch10056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The synthesis of alkaloid GB 13 (4), isolated from the North Australian rain forest tree Galbulimima belgraveana is described. Birch reductive alkylation of 2,5-dimethoxybenzoic acid by 3-methoxybenzyl bromide, followed by an acid-catalyzed cyclization was used to synthesize the [3.3.1]bicyclononane 12. Ring contraction performed on the diazoketone 19 followed by a Diels–Alder reaction generated a pentacyclic intermediate 34 with a carbon skeleton closely resembling the target alkaloid. The surplus nitrile substituent, required for activation and regioselectivity in the Diels–Alder reaction, was removed by treatment with lithium and liquid ammonia. Birch reduction of the aromatic ring could be performed at the same time to give diene 38 and thence enone 41, which was cleaved by means of an Eschenmoser fragmentation. The piperidine ring found in the natural product was formed by reductive cyclization of bis-oxime 49 derived from the alkynyl ketone 48 and the resulting material further elaborated to GB 13.
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43
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Mander LN, Willis AC, Herlt AJ, Taylor WC. The structures of three new Galbulimima alkaloids. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.10.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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45
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Abstract
We describe the first total synthesis of (-)-himandrine, a member of the class II galbulimima alkaloids. Noteworthy features of this chemistry include a diastereoselective Diels-Alder reaction in the rapid synthesis of the tricycle ABC-ring system in an enantiomerically enriched form, the use of a formal [3+3] annulation strategy to secure the CDE-ring system with complete diastereoselection, and successful implementation of our biogenetically inspired oxidative spirocyclization of an advanced intermediate. The successful and direct late-stage formation of the F-ring in the hexacyclic core of himandrine drew on the power of biogenetic considerations and fully utilized the inherent chemistry of a plausible biosynthetic intermediate.
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Affiliation(s)
- Mohammad Movassaghi
- Massachusetts Institute of Technology, Department of Chemistry, Cambridge, Massachusetts 02139, USA.
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46
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Gourdet B, Rudkin ME, Watts CA, Lam HW. Preparation of Multisubstituted Enamides via Rhodium-Catalyzed Carbozincation and Hydrozincation of Ynamides. J Org Chem 2009; 74:7849-58. [PMID: 19754108 DOI: 10.1021/jo901658v] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benoit Gourdet
- School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
| | - Mairi E. Rudkin
- School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
| | - Ciorsdaidh A. Watts
- School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
| | - Hon Wai Lam
- School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
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47
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Hayashi R, Hsung RP, Feltenberger JB, Lohse AG. Regio- and stereoselective isomerizations of allenamides: synthesis of 2-amido-dienes and their tandem isomerization-electrocyclic ring-closure. Org Lett 2009; 11:2125-8. [PMID: 19371081 DOI: 10.1021/ol900647s] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A regio- and stereoselective isomerization of allenamides is described, leading to preparations of de novo 2-amido-dienes and a tandem isomerization-6pi-electron electrocyclic ring-closure.
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Affiliation(s)
- Ryuji Hayashi
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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48
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Chen Y, Zhong C, Petersen JL, Akhmedov NG, Shi X. One-Pot Asymmetric Synthesis of Substituted Piperidines by Exocyclic Chirality Induction. Org Lett 2009; 11:2333-6. [PMID: 19438199 DOI: 10.1021/ol900708d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yunfeng Chen
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506
| | - Cheng Zhong
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506
| | - Jeffrey L. Petersen
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506
| | - Novruz G. Akhmedov
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506
| | - Xiaodong Shi
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506
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49
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Evano G, Blanchard N, Toumi M. Copper-mediated coupling reactions and their applications in natural products and designed biomolecules synthesis. Chem Rev 2008; 108:3054-131. [PMID: 18698737 DOI: 10.1021/cr8002505] [Citation(s) in RCA: 1678] [Impact Index Per Article: 104.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Gwilherm Evano
- Institut Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint Quentin en Yvelines, 45 avenue des Etats-Unis, 78035 Versailles Cedex, France.
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50
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Microwave Assisted N-Alkenyl Condensation between Pyrrolidine-2-thione and Various Aldehydes. B KOREAN CHEM SOC 2008. [DOI: 10.5012/bkcs.2008.29.3.604] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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