1
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Peters BBC, Andersson PG. The Implications of the Brønsted Acidic Properties of Crabtree-Type Catalysts in the Asymmetric Hydrogenation of Olefins. J Am Chem Soc 2022; 144:16252-16261. [PMID: 36044252 PMCID: PMC9479089 DOI: 10.1021/jacs.2c07023] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral iridium complexes derived from Crabtree's catalyst are highly useful in modern hydrogenations of olefins attributed to high reactivity, stereoselectivity, and stability. Despite that these precatalysts are pH neutral, the reaction mixtures turn acidic under hydrogenation conditions. This Perspective is devoted to the implications of the intrinsic Brønsted acidity of catalytic intermediates in asymmetric hydrogenation of olefins. Despite that the acidity has often been used only as a rationale for side-product formation, more recent methodologies have started to use this property advantageously. We hope that this Perspective serves as a stimulant for the development of such compelling and new asymmetric hydrogenations. The inherent scientific opportunities in utilizing or annihilating the generated Brønsted acid are enormous, and potential new innovations are outlined toward the end.
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Affiliation(s)
- Bram B C Peters
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Pher G Andersson
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden.,School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, Durban, 4000, South Africa
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2
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Witte JM, Service J, Addo MA, Semakieh B, Collins E, Sams C, Dorsey TR, Garrelts E, Blumenshine CA, Cooper T, Martinez M, Hamaker CG, Ferrence GM, Hitchcock SR. Diastereoselective and Enantioselective Synthesis of α- p-Methoxyphenoxy-β-Lactones: Dependence on the Stereoelectronic Properties of the β-Hydroxy-α- p-Methoxyphenoxycarboxylic Acid Precursors. J Org Chem 2022; 87:9619-9634. [PMID: 35862509 DOI: 10.1021/acs.joc.2c00608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of β-hydroxy-α-p-methoxyphenoxy carboxylic acids derived from the asymmetric glycolate aldol addition reaction with p-nitrobenzenesulfonyl chloride yielded divergent results depending on the nature of the β-substituent of the carboxylic acid. Substrates bearing either alkyl substituents (R = -n-butyl, -n-octyl, -benzyl, isopropyl, -tert-butyl) or aryl systems bearing electron-withdrawing substituents (R = -p-C6H4Cl, -p-C6H4Br, -p-C6H4NO2) yielded β-lactones. In contrast, α-p-methoxyphenoxy-β-hydroxycarboxylic acids bearing electron-donating aryl groups or the sterically demanding 2-naphthyl group formed (Z)-alkenes.
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Affiliation(s)
- Jordan M Witte
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Jasmine Service
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Marian Aba Addo
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Bader Semakieh
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Erin Collins
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Christopher Sams
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Timothy R Dorsey
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Elizabeth Garrelts
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Cassidy A Blumenshine
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Trace Cooper
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Moses Martinez
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Christopher G Hamaker
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Shawn R Hitchcock
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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3
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Wang N, Wu Z, Wang J, Ullah N, Lu Y. Recent applications of asymmetric organocatalytic annulation reactions in natural product synthesis. Chem Soc Rev 2021; 50:9766-9793. [PMID: 34286704 DOI: 10.1039/d0cs01124j] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The past two decades have witnessed remarkable growth of asymmetric organocatalysis, which is now a firmly established synthetic tool, serving as a powerful platform for the production of chiral molecules. Ring structures are ubiquitous in organic compounds, and, in the context of natural product synthesis, strategic construction of ring motifs is often crucial, fundamentally impacting the eventual fate of the whole synthetic plan. In this review, we provide a comprehensive and updated summary of asymmetric organocatalytic annulation reactions; in particular, the application of these annulation strategies in natural product synthesis will be highlighted.
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Affiliation(s)
- Nengzhong Wang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.
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4
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Guo Z, Bao R, Li Y, Li Y, Zhang J, Tang Y. Tailored Synthesis of Skeletally Diverse Stemona Alkaloids through Chemoselective Dyotropic Rearrangements of β-Lactones. Angew Chem Int Ed Engl 2021; 60:14545-14553. [PMID: 33848039 DOI: 10.1002/anie.202102614] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Indexed: 12/13/2022]
Abstract
The collective synthesis of skeletally diverse Stemona alkaloids featuring tailored dyotropic rearrangements of β-lactones as key elements is described. Specifically, three typical 5/7/5 tricyclic skeletons associated with stemoamide, tuberostemospiroline and parvistemonine were first accessed through chemoselective dyotropic rearrangements of β-lactones involving alkyl, hydrogen, and aryl migration, respectively. By the rational manipulation of substrate structures and reaction conditions, these dyotropic rearrangements proceeded with excellent efficiency, good chemoselectivity and high stereospecificity. Furthermore, several polycyclic Stemona alkaloids, including saxorumamide, isosaxorumamide, stemonine and bisdehydroneostemoninine, were obtained from the aforementioned tricyclic skeletons through late-stage derivatizations. A novel visible-light photoredox-catalyzed formal [3+2] cycloaddition was also developed, which offers a valuable tool for accessing oxaspirobutenolide and related scaffolds.
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Affiliation(s)
- Zhen Guo
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
| | - Ruiyang Bao
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
| | - Yuanhe Li
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
| | - Yunshan Li
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
| | - Jingyang Zhang
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
| | - Yefeng Tang
- School of Pharmaceutical Sciences, MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing, 100084, China
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5
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Guo Z, Bao R, Li Y, Li Y, Zhang J, Tang Y. Tailored Synthesis of Skeletally Diverse
Stemona
Alkaloids through Chemoselective Dyotropic Rearrangements of β‐Lactones. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102614] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Zhen Guo
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
| | - Ruiyang Bao
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
| | - Yuanhe Li
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
| | - Yunshan Li
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
| | - Jingyang Zhang
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
| | - Yefeng Tang
- School of Pharmaceutical Sciences MOE Key Laboratory of, Bioorganic Phosphorus Chemistry and Chemical Biology Tsinghua University Beijing 100084 China
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6
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Shiomi S, Ishikawa H. Total Synthesis of Enantioenriched Quinine. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.145] [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)
- Shinya Shiomi
- Department of Chemistry, Graduate School of Science, Tohoku University
| | - Hayato Ishikawa
- Department of Chemistry, Faculty of Advanced Science and Technology, Kumamoto University
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7
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Senapati BK. Progress in the total synthesis of inthomycins. Beilstein J Org Chem 2021; 17:58-82. [PMID: 33488832 PMCID: PMC7801802 DOI: 10.3762/bjoc.17.7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 12/03/2020] [Indexed: 12/23/2022] Open
Abstract
The inthomycin family of antibiotics, isolated from Streptomyces strains, are interesting molecules for synthesis due to their characteristic common oxazole polyene chiral allylic β-hydroxycarbonyl fragments and significant biological activities. The full structural motif of the inthomycins is found in several more complex natural products including the oxazolomycins, 16-methyloxazolomycin, curromycins A and B, and KSM-2690. This review summarises the application of various efforts towards the synthesis of inthomycins and their analogues systematically.
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Affiliation(s)
- Bidyut Kumar Senapati
- Department of Chemistry, Prabhat Kumar College, Contai, 721404, India, Tel.: +91 8145207480
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8
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Mu Y, Jiang Y, Qu X, Liu B, Tan J, Li G, Jiang M, Li L, Han L, Huang X. Oxazolomycins produced by Streptomyces glaucus and their cytotoxic activity. RSC Adv 2021; 11:35011-35019. [PMID: 35494745 PMCID: PMC9042891 DOI: 10.1039/d1ra06182h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/16/2021] [Indexed: 11/21/2022] Open
Abstract
Six oxazolomycins (1–6) were isolated from the fermentation broth of a soil-borne bacterial strain, Streptomyces glaucus. The structures of the new compounds, oxazolomycins D–F (1–3) and glaucumycins A, B (6a/6b), were elucidated by detailed spectroscopic data analysis. Oxazolomycins 1, 2, 4, and 5 demonstrated weak or modest cytotoxic activities against four human cancer cell lines, with IC50 values ranging from 10.6 ± 1.7 to 89.5 ± 6.6 μM (or >100 μM). Further study showed that 4 caused S phase cell cycle arrest in SMMC7721 cells through down-regulating the protein expression of cyclin A2, CDK2. Meanwhile, 4 induced apoptosis in SMMC7721 cells through down-regulating the protein levels of Bcl-2, up-regulating the levels of Bax, and activating the cleavage of caspase-3. Six oxazolomycins (1–6) were isolated from the fermentation broth of a soil-borne bacterial strain, Streptomyces glaucus.![]()
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Affiliation(s)
- Yu Mu
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Yi Jiang
- Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, China
| | - Xiaodan Qu
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Bo Liu
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Junfeng Tan
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Guiding Li
- Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, China
| | - Mingguo Jiang
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning 530008, China
| | - Liya Li
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Li Han
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
| | - Xueshi Huang
- Institute of Microbial Pharmaceuticals, College of Life and Health Sciences, Northeastern University, Shenyang 110819, China
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9
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Wu H, Margarita C, Jongcharoenkamol J, Nolan MD, Singh T, Andersson PG. Kinetic resolution of racemic allylic alcohols via iridium-catalyzed asymmetric hydrogenation: scope, synthetic applications and insight into the origin of selectivity. Chem Sci 2020; 12:1937-1943. [PMID: 34163958 PMCID: PMC8179068 DOI: 10.1039/d0sc05276k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Asymmetric hydrogenation is one of the most commonly used tools in organic synthesis, whereas, kinetic resolution via asymmetric hydrogenation is less developed. Herein, we describe the first iridium catalyzed kinetic resolution of a wide range of trisubstituted secondary and tertiary allylic alcohols. Large selectivity factors were observed in most cases (s up to 211), providing the unreacted starting materials in good yield with high levels of enantiopurity (ee up to >99%). The utility of this method is highlighted in the enantioselective formal synthesis of some bioactive natural products including pumiliotoxin A, inthomycin A and B. DFT studies and a selectivity model concerning the origin of selectivity are presented. Asymmetric hydrogenation is one of the most commonly used tools in organic synthesis, whereas, kinetic resolution via asymmetric hydrogenation was less developed.![]()
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Affiliation(s)
- Haibo Wu
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory 106 91 Stockholm Sweden
| | - Cristiana Margarita
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory 106 91 Stockholm Sweden
| | - Jira Jongcharoenkamol
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory 106 91 Stockholm Sweden
| | - Mark D Nolan
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory 106 91 Stockholm Sweden
| | - Thishana Singh
- School of Chemistry and Physics, University of Kwazulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Pher G Andersson
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory 106 91 Stockholm Sweden .,School of Chemistry and Physics, University of Kwazulu-Natal Private Bag X54001 Durban 4000 South Africa
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10
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Characterization of inthomycin biosynthetic gene cluster revealing new insights into carboxamide formation. Chin J Nat Med 2020; 18:677-683. [PMID: 32928511 DOI: 10.1016/s1875-5364(20)60006-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Indexed: 11/20/2022]
Abstract
Inthomycins are polyketide antibiotics which contain a terminal carboxamide group and a triene chain. Inthomycin B (1) and its two new analogues 2 and 3 were isolated from the crude extract of Streptomyces pactum L8. Identification of the gene cluster for inthomycin biosynthesis as well as the 15N-labeled glycine incorporation into inthomycins are described. Combined with the gene deletion of the rare P450 domain in the NRPS module, a formation mechanism of carboxamide moiety in inthomycins was proposed via an oxidative release of the assembly chain assisted by the P450 domain.
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11
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Oka K, Fuchi S, Komine K, Fukuda H, Hatakeyama S, Ishihara J. Catalytic Asymmetric Total Synthesis of Exiguolide. Chemistry 2020; 26:12862-12867. [PMID: 32428309 DOI: 10.1002/chem.202001773] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 05/09/2020] [Indexed: 11/12/2022]
Abstract
The catalytic asymmetric total synthesis of (-)-exiguolide, a complex 20-membered macrolide embedded with a bis(tetrahydropyran) motif, is reported. The convergent synthesis involves the construction of the C1-C11 tetrahydropyran segment via catalytic asymmetric allylation and Prins cyclization, and the formation of the C12-C21 phosphonate segment via catalytic asymmetric cyclocondensation reaction and Johnson-Claisen rearrangement. The synthesis of 15-epi-exiguolide is also described.
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Affiliation(s)
- Kengo Oka
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Shunsuke Fuchi
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Keita Komine
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Hayato Fukuda
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Susumi Hatakeyama
- Medical Innovation Center, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
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12
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Kim JH, Song Y, Kim MJ, Kim S. Asymmetric Total Synthesis of Inthomycins A, B, and C. J Org Chem 2020; 85:4795-4806. [PMID: 32162914 DOI: 10.1021/acs.joc.0c00017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report the asymmetric total syntheses of inthomycin antibiotics containing a methylene-interrupted oxazolyl-triene motif. Utilizing the α,β-unsaturated aldehyde as a common intermediate, all three inthomycins A-C were divergently synthesized. The asymmetric ynone reduction provided an R-configured secondary alcohol as in the natural products with high enantioselectivity. The geometrically different triene units for each inthomycin were stereoselectively established via methyl cuprate conjugate addition, isomerization of the α,β-unsaturated aldehyde intermediate, and stereoretentive cross-coupling reactions.
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Affiliation(s)
- Jae Hyun Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Yeonghun Song
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Min Jung Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
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13
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Lee V. Application of copper(i) salt and fluoride promoted Stille coupling reactions in the synthesis of bioactive molecules. Org Biomol Chem 2020; 17:9095-9123. [PMID: 31596305 DOI: 10.1039/c9ob01602c] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The Stille coupling between organostannanes and organohalides is an effective catalytic method for organic synthesis. Despite the ample amount of published results in this area, finding the optimal conditions for this transformation is often not straightforward. It was observed that this reaction could be accelerated with improved efficiency by the addition of a Cu(i) salt and fluoride. This review summarises the application of this simple protocol in the synthesis of natural products, their analogues and other biologically active molecules, from 2004 to 2018.
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Affiliation(s)
- Victor Lee
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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14
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Oleksak P, Gonda J, Nepovimova E, Kuca K, Musilek K. The oxazolomycin family: a review of current knowledge. RSC Adv 2020; 10:40745-40794. [PMID: 35519217 PMCID: PMC9057759 DOI: 10.1039/d0ra08396h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 10/25/2020] [Indexed: 12/19/2022] Open
Abstract
Oxazolomycin A and neooxazolomycin were firstly isolated in 1985 by the group of Uemura et al. from the Streptomyces sp. bacteria.
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Affiliation(s)
- Patrik Oleksak
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Jozef Gonda
- Pavol Jozef Safarik University
- Faculty of Science
- Department of Organic Chemistry
- Kosice
- Slovak Republic
| | - Eugenie Nepovimova
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Kuca
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Musilek
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
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15
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Zhang H, Wu X, Wei Y, Zhu C. Radical-Mediated Heck-Type Alkylation: Stereoconvergent Synthesis of Functionalized Polyenes. Org Lett 2019; 21:7568-7572. [DOI: 10.1021/acs.orglett.9b02838] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hong Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Xinxin Wu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Yunlong Wei
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
| | - Chen Zhu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China
- Key Laboratory of Synthesis Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, 345 Lingling Road, Shanghai 200032, China
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16
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Kim JH, Kim I, Song Y, Kim MJ, Kim S. Asymmetric Total Synthesis of (+)‐Neooxazolomycin Using a Chirality‐Transfer Strategy. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906158] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jae Hyun Kim
- College of PharmacySeoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Korea
| | - Illan Kim
- College of PharmacySeoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Korea
| | - Yeonghun Song
- College of PharmacySeoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Korea
| | - Min Jung Kim
- College of PharmacySeoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Korea
| | - Sanghee Kim
- College of PharmacySeoul National University 1 Gwanak-ro, Gwanak-gu Seoul 08826 Korea
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17
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Kim JH, Kim I, Song Y, Kim MJ, Kim S. Asymmetric Total Synthesis of (+)-Neooxazolomycin Using a Chirality-Transfer Strategy. Angew Chem Int Ed Engl 2019; 58:11018-11022. [PMID: 31168911 DOI: 10.1002/anie.201906158] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Indexed: 11/09/2022]
Abstract
The total synthesis of (+)-neooxazolomycin was achieved from the amino-acid d-serine. The efficiency of this approach is derived from the use of principles of memory of chirality and dynamic kinetic resolution in the intramolecular aldol reaction of a serine derivative to build the densely functionalized lactam framework and to install three contiguous stereocenters. The key intermediate was readily elaborated to the target natural product.
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Affiliation(s)
- Jae Hyun Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Illan Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Yeonghun Song
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Min Jung Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
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18
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Nishimaru T, Eto K, Komine K, Ishihara J, Hatakeyama S. Total Synthesis of Lajollamycin B. Chemistry 2019; 25:7927-7934. [DOI: 10.1002/chem.201901069] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Tatsuya Nishimaru
- Graduate School of Biomedical SciencesNagasaki University, Bunkyo-machi Nagasaki 8 52-8521 Japan
| | - Kohei Eto
- Graduate School of Biomedical SciencesNagasaki University, Bunkyo-machi Nagasaki 8 52-8521 Japan
| | - Keita Komine
- Graduate School of Biomedical SciencesNagasaki University, Bunkyo-machi Nagasaki 8 52-8521 Japan
| | - Jun Ishihara
- Graduate School of Biomedical SciencesNagasaki University, Bunkyo-machi Nagasaki 8 52-8521 Japan
| | - Susumi Hatakeyama
- Medical Innovation CenterNagasaki University, Bunkyo-machi Nagasaki 852-8521 Japan
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19
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Barrios Antúnez DJ, Greenhalgh MD, Brueckner AC, Walden DM, Elías-Rodríguez P, Roberts P, Young BG, West TH, Slawin AMZ, Ha-Yeon Cheong P, Smith AD. Catalytic enantioselective synthesis of perfluoroalkyl-substituted β-lactones via a concerted asynchronous [2 + 2] cycloaddition: a synthetic and computational study. Chem Sci 2019; 10:6162-6173. [PMID: 31360423 PMCID: PMC6585878 DOI: 10.1039/c9sc00390h] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 04/27/2019] [Indexed: 11/21/2022] Open
Abstract
The enantioselective preparation of a range of perfluoroalkyl-substituted β-lactones through an isothiourea (HyperBTM) catalysed reaction using symmetric anhydrides as ammonium enolate precursors and perfluoroalkylketones (RF = CF3, C2F5, C4F9) is reported. Following optimisation, high diastereo- and enantioselectivity was observed for β-lactone formation using C2F5- and C4F9-substituted ketones at room temperature (26 examples, up to >95 : 5 dr and >99 : 1 er), whilst -78 °C was necessary for optimal dr and er with CF3-substituted ketones (11 examples, up to >95 : 5 dr and >99 : 1 er). Derivatisation of the β-lactones through ring-opening, as well as a two-step conversion to give perfluoroalkyl-substituted oxetanes, is demonstrated without loss of stereochemical integrity. Density functional theory computations, alongside 13C natural abundance KIE studies, have been used to probe the reaction mechanism with a concerted asynchronous [2 + 2]-cycloaddition pathway favoured over a stepwise aldol-lactonisation process.
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Affiliation(s)
| | - Mark D Greenhalgh
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
| | - Alexander C Brueckner
- Department of Chemistry , Oregon State University , 153 Gilbert Hall , Corvallis , Oregon 97333 , USA .
| | - Daniel M Walden
- Department of Chemistry , Oregon State University , 153 Gilbert Hall , Corvallis , Oregon 97333 , USA .
| | - Pilar Elías-Rodríguez
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
| | - Patrick Roberts
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
| | - Benjamin G Young
- Department of Chemistry, Physics, and Engineering , Biola University , 315 Lim Center , La Mirada , California 90639 , USA
| | - Thomas H West
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
| | - Alexandra M Z Slawin
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
| | - Paul Ha-Yeon Cheong
- Department of Chemistry , Oregon State University , 153 Gilbert Hall , Corvallis , Oregon 97333 , USA .
| | - Andrew D Smith
- EaStCHEM , School of Chemistry , University of St Andrews , North Haugh , St Andrews , KY16 9ST , UK .
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20
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Hale KJ, Manaviazar S, Watson HA. The O‐Directed Free Radical Hydrostannation of Propargyloxy Dialkyl Acetylenes with Ph3SnH/cat. Et3B. A Refutal of the Stannylvinyl Cation Mechanism. CHEM REC 2018; 19:238-319. [DOI: 10.1002/tcr.201700104] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 09/04/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Karl J. Hale
- School of Chemistry and Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB)Queen's University Belfast Stranmillis Road Belfast BT9 5AG, Northern Ireland United Kingdom
| | - Soraya Manaviazar
- School of Chemistry and Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB)Queen's University Belfast Stranmillis Road Belfast BT9 5AG, Northern Ireland United Kingdom
| | - Hamish A. Watson
- School of Chemistry and Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB)Queen's University Belfast Stranmillis Road Belfast BT9 5AG, Northern Ireland United Kingdom
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21
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Kumar M, Bromhead L, Anderson Z, Overy A, Burton JW. Short, Tin-Free Synthesis of All Three Inthomycins. Chemistry 2018; 24:16753-16756. [PMID: 30338587 PMCID: PMC6348375 DOI: 10.1002/chem.201803794] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Indexed: 11/22/2022]
Abstract
The inthomycins are a family of structurally and biologically rich natural products isolated from Streptomyces species. Herein the implementation of a modular synthetic route is reported that has enabled the enantioselective synthesis of all three inthomycins. Key steps include Suzuki and Sonogashira cross‐couplings and an enantioselective Kiyooka aldol reaction.
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Affiliation(s)
- Manjeet Kumar
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Liam Bromhead
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Zoe Anderson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Alistair Overy
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Jonathan W Burton
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
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22
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Balcells S, Haughey MB, Walker JCL, Josa-Culleré L, Towers C, Donohoe TJ. Asymmetric Total Synthesis of (−)-(3R)-Inthomycin C. Org Lett 2018; 20:3583-3586. [DOI: 10.1021/acs.orglett.8b01370] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sandra Balcells
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, U.K
| | - Maxwell B. Haughey
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, U.K
| | - Johannes C. L. Walker
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, U.K
| | - Laia Josa-Culleré
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, U.K
| | - Christopher Towers
- Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive Oxford OX3 7DQ, U.K
| | - Timothy J. Donohoe
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, U.K
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23
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Wu Q, Zhang G, Wang B, Li X, Yue S, Chen J, Zhang H, Wang H. Production and Identification of Inthomycin B Produced by a Deep-Sea Sediment-Derived Streptomyces sp. YB104 Based on Cultivation-Dependent Approach. Curr Microbiol 2018. [PMID: 29520513 DOI: 10.1007/s00284-018-1469-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The natural products discovery program in our group utilizes deep-sea sediment-derived microorganisms and employs a bio-active guided isolation procedure and one strain many compounds (OSMAC) approach to screen bio-active natural products for practical applications in the medicinal and agricultural industry. OSMAC strategy is employed to stimulate secondary metabolite production through changing culture conditions. In this paper, we applied cultivation-dependent procedure, changing media type, leading to the discovery of a bio-active compound named inthomycin B (1) from a marine-derived Streptomyces sp. YB104. The compound was characterized based on extensive spectroscopic analyses and comparison to that in the reported literature. The quantification of inthomycin B demonstrated that Streptomyces sp. YB104 produced moderate yield of inthomycin B with a yield around 25 mg/l after 14 days. Thus, Streptomyces sp. YB104 was considered to be a useful potential as a first industrial-producing strain of inthomycins.
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Affiliation(s)
- Qihao Wu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China
| | - Gaiyun Zhang
- Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, Fujian, China
| | - Bixia Wang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China
| | - Xin Li
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China
| | - Shaopeng Yue
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China
| | - Jianwei Chen
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China
| | - Huawei Zhang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China.
| | - Hong Wang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, China.
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24
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Suroto DA, Kitani S, Miyamoto KT, Sakihama Y, Arai M, Ikeda H, Nihira T. Activation of cryptic phthoxazolin A production in Streptomyces avermitilis by the disruption of autoregulator-receptor homologue AvaR3. J Biosci Bioeng 2017; 124:611-617. [PMID: 28728974 DOI: 10.1016/j.jbiosc.2017.06.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/08/2017] [Accepted: 06/26/2017] [Indexed: 11/28/2022]
Abstract
The genomes of actinomycetes encode many cryptic novel/useful bioactive compounds, but access to these cryptic secondary metabolites remains limited. Streptomyces avermitilis predominantly produces three polyketide antibiotics (avermectin, filipin, and oligomycin) but has the potential to produce more secondary metabolites based on the number of cryptic biosynthetic gene clusters. Here, we extensively investigated the metabolite profiles of a gene disruptant of AvaR3 (an autoregulator receptor homologue), which is involved in the pleiotropic regulation of antibiotic production and cell morphology. Unlike the wild-type strain, the avaR3 mutant accumulated compound 3 in the culture. The chemical structure of compound 3 was elucidated on the basis of various spectroscopic analyses, and was identified as phthoxazolin A, a cellulose synthesis inhibitor. Bioassays demonstrated that compound 3 exerts growth inhibitory activity against a broad range of plant pathogenic oomycetes. Moreover, unlike avermectin production, phthoxazolin A (3) production was negatively controlled by avenolide, a new type of autoregulator in streptomycetes, through the function of AvaR3. These results suggest that the genetic manipulation of autoregulator receptor homologues would be a valuable tool for the discovery of cryptic bioactive compounds.
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Affiliation(s)
- Dian Anggraini Suroto
- International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigeru Kitani
- International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kiyoko T Miyamoto
- International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasuko Sakihama
- Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
| | - Masayoshi Arai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Haruo Ikeda
- Kitasato Institute for Life Sciences, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa 252-0373, Japan
| | - Takuya Nihira
- International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; MU-OU Collaborative Research Center for Bioscience and Biotechnology, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand.
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25
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Abstract
Covering: July 2012 to June 2015. Previous review: Nat. Prod. Rep., 2013, 30, 869-915The structurally diverse imidazole-, oxazole-, and thiazole-containing secondary metabolites are widely distributed in terrestrial and marine environments, and exhibit extensive pharmacological activities. In this review the latest progress involving the isolation, biological activities, and chemical and biogenetic synthesis studies on these natural products has been summarized.
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Affiliation(s)
- Zhong Jin
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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26
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Moloney MG. Natural Products as a Source for Novel Antibiotics. Trends Pharmacol Sci 2016; 37:689-701. [DOI: 10.1016/j.tips.2016.05.001] [Citation(s) in RCA: 161] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 05/02/2016] [Accepted: 05/02/2016] [Indexed: 01/04/2023]
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27
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Athawale PR, Kashinath K, Reddy DS. Enantiospecific Formal Synthesis of Inthomycin C. ChemistrySelect 2016. [DOI: 10.1002/slct.201600128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Paresh R. Athawale
- Division of Organic chemistry; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road, Pune 411008 India
| | - K. Kashinath
- Division of Organic chemistry; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road, Pune 411008 India
| | - D. Srinivasa Reddy
- Division of Organic chemistry; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road, Pune 411008 India
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28
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Börding S, Bach T. An enantioselective synthesis of the C24-C40 fragment of (-)-pulvomycin. Chem Commun (Camb) 2015; 50:4901-3. [PMID: 24691561 DOI: 10.1039/c4cc01338g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The C24-C40 fragment of (-)-pulvomycin was prepared in enantiomerically pure form using a concise synthesis method (15 linear steps from D-fucose, 6.8% overall yield) featuring a diastereoselective addition to an aldehyde, a β-selective glycosylation and a Stille cross-coupling as the key steps.
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Affiliation(s)
- Sandra Börding
- Lehrstuhl für Organische Chemie I, Technische Universität München, 85747 Garching, Germany.
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29
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Ishihara J, Hatakeyama S. Total Synthesis of Oxazolomycins. CHEM REC 2014; 14:663-77. [DOI: 10.1002/tcr.201402009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Indexed: 01/22/2023]
Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki 852-8521 Japan
| | - Susumi Hatakeyama
- Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki 852-8521 Japan
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30
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Hale KJ, Hatakeyama S, Urabe F, Ishihara J, Manaviazar S, Grabski M, Maczka M. The absolute configuration for inthomycin C: revision of previously published work with a reinstatement of the (3R)-configuration for (-)-inthomycin C. Org Lett 2014; 16:3536-9. [PMID: 24957611 DOI: 10.1021/ol501484t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Stereochemical evidence is presented to demonstrate that (-)-inthomycin C has (3R)- and not (3S)-stereochemistry. Careful reappraisal of the previously published work2-5 now indicates that the Hatakeyama, Hale, Ryu, and Taylor teams all have synthesized (-)-(3R)-inthomycin C. The newly measured [α]D of pure (-)-(3R)-inthomycin C (98% ee) is -7.9 (c 0.33, CHCl3) and not -41.5 (c 0.1, CHCl3) as was previously reported in 2012.
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Affiliation(s)
- Karl J Hale
- The School of Chemistry and Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB), The Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
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31
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Hale KJ, Grabski M, Manaviazar S, Maczka M. Asymmetric total synthesis of (+)-inthomycin C via O-directed free radical alkyne hydrostannation with Ph3SnH and catalytic Et3B: reinstatement of the Zeeck-Taylor (3R)-structure for (+)-inthomycin C. Org Lett 2014; 16:1164-7. [PMID: 24502463 DOI: 10.1021/ol5000499] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new pathway to (+)-inthomycin C is reported that exploits an O-directed free radical hydrostannation reaction on (-)-12 and a Stille cross-coupling as key steps. Significantly, the latter process was effected on 19 where a gauche-pentane repulsive interaction could interfere. Our stereochemical studies on the alkynol (-)-12 and the enyne (+)-7 confirm that Ryu and Hatakeyama's (3S)-stereochemical revision of (+)-inthomycin C is invalid and that Zeeck and Taylor's original (3R)-stereostructure for (+)-inthomycin C is correct.
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Affiliation(s)
- Karl J Hale
- The School of Chemistry and Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB), the Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
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32
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Hatakeyama S. Total Synthesis of Biologically Active Natural Products Based on Highly Selective Synthetic Methodologies. Chem Pharm Bull (Tokyo) 2014; 62:1045-61. [DOI: 10.1248/cpb.c14-00474] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Susumi Hatakeyama
- Graduate School of Biomedical Sciences, Nagasaki University, 1–14 Bunkyo-machi, Nagasaki 852–8521, Japan
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33
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Heravi MM, Hashemi E, Azimian F. Recent developments of the Stille reaction as a revolutionized method in total synthesis. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.07.108] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34
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Heaviside EA, Moloney MG, Thompson AL. Diastereoselective intramolecular aldol ring closures of threonine derivatives leading to densely functionalised pyroglutamates related to oxazolomycin. RSC Adv 2014. [DOI: 10.1039/c4ra01967a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Intramolecular aldol reactions on oxazolidine templates derived from threonine may be used to generate libraries of densely functionalised pyroglutamates with a high level of diastereoselectivity.
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Affiliation(s)
| | - Mark G. Moloney
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford, UK
| | - Amber L. Thompson
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford, UK
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35
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Souris C, Frébault F, Patel A, Audisio D, Houk KN, Maulide N. Stereoselective synthesis of dienyl-carboxylate building blocks: formal synthesis of inthomycin C. Org Lett 2013; 15:3242-5. [PMID: 23763296 DOI: 10.1021/ol401226y] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A direct synthesis of stereodefined halodienes is reported. Those key building blocks enable a concise access to polyenic products, as demonstrated in a modular synthesis of Inthomycin C.
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Affiliation(s)
- Caroline Souris
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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