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Yan P, Stegbauer S, Wu Q, Kolodzeiski E, Stein CJ, Lu P, Bach T. Enantioselective Intramolecular ortho Photocycloaddition Reactions of 2-Acetonaphthones. Angew Chem Int Ed Engl 2024; 63:e202318126. [PMID: 38275271 DOI: 10.1002/anie.202318126] [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] [Received: 11/27/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 01/27/2024]
Abstract
2-Acetonaphthones, which bear an alkenyl group tethered to its C1 carbon atom via an oxygen atom, were found to undergo an enantioselective intramolecular ortho photocycloaddition reaction. A chiral oxazaborolidine Lewis acid leads to a bathochromic absorption shift of the substrate and enables an efficient enantioface differentiation. Visible light irradiation (λ=450 nm) triggers the reaction which is tolerant of various groups at almost any position except carbon atom C8 (16 examples, 53-99 % yield, 80-97 % ee). Consecutive reactions were explored including a sensitized rearrangement to tetrahydrobiphenylenes, which occurred with full retention of configuration. Evidence was collected that the catalytic photocycloaddition occurs via triplet intermediates, and the binding mode of the acetonaphthone to the chiral Lewis acid was elucidated by DFT calculations.
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Affiliation(s)
- Peng Yan
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Simone Stegbauer
- Department Chemie and Catalysis Research Center (CRC) School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, D-85747, Garching, Germany
| | - Qinqin Wu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Elena Kolodzeiski
- Department Chemie and Catalysis Research Center (CRC) School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, D-85747, Garching, Germany
| | - Christopher J Stein
- Department Chemie and Catalysis Research Center (CRC) School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, D-85747, Garching, Germany
| | - Ping Lu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC) School of Natural Sciences, Technische Universität München, Lichtenbergstraße 4, D-85747, Garching, Germany
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Niwa K, Ohashi M, Xie K, Chiang CY, Jamieson CS, Sato M, Watanabe K, Liu F, Houk K, Tang Y. Biosynthesis of Polycyclic Natural Products from Conjugated Polyenes via Tandem Isomerization and Pericyclic Reactions. J Am Chem Soc 2023; 145:13520-13525. [PMID: 37310230 PMCID: PMC10871872 DOI: 10.1021/jacs.3c02380] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We report biosynthetic pathways that can synthesize and transform conjugated octaenes and nonaenes to complex natural products. The biosynthesis of (-)-PF1018 involves an enzyme PfB that can control the regio-, stereo-, and periselectivity of multiple reactions starting from a conjugated octaene. Using PfB as a lead, we discovered a homologous enzyme, BruB, that facilitates diene isomerization, tandem 8π-6π-electrocyclization, and a 1,2-divinylcyclobutane Cope rearrangement to generate a new-to-nature compound.
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Affiliation(s)
- Kanji Niwa
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
| | - Masao Ohashi
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
| | - Kaili Xie
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China
| | - Chen-Yu Chiang
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
| | - Cooper S. Jamieson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Michio Sato
- Department of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Kenji Watanabe
- Department of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Fang Liu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - K.N. Houk
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Yi Tang
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
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Jänner S, Isak D, Li Y, Houk KN, Miller AK. Bioinspired Asymmetric Total Synthesis of Emeriones A–C**. Angew Chem Int Ed Engl 2022; 61:e202205878. [PMID: 35670768 PMCID: PMC9401028 DOI: 10.1002/anie.202205878] [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: 04/22/2022] [Indexed: 01/10/2023]
Abstract
We report asymmetric bioinspired total syntheses of the fungal metabolites emeriones A–C via stereoselective oxidations of two bicyclo[4.2.0]octadiene diastereomers. The central bicyclic scaffolds are prepared in an 8π/6π electrocyclization cascade of a stereodefined pentaene, which contains the fully assembled side chains of the emeriones. The anti‐aldol side chain is made using a Paterson‐aldol addition, and the epoxide of the dioxabicyclo[3.1.0]hexane side chain via ring‐closure onto an oxidized acetal. Our work has enabled the structural revision of emerione C, and resulted in the synthesis of a “missing” family member, which we call emerione D. DFT calculations identified two methyl groups that govern torquoselectivity in the 8π/6π cascade.
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Affiliation(s)
- Sven Jänner
- Cancer Drug Development Group German Cancer Research Center (DKFZ) Heidelberg Germany
| | - Daniel Isak
- Cancer Drug Development Group German Cancer Research Center (DKFZ) Heidelberg Germany
| | - Yuli Li
- Department of Chemistry School of Science Tianjin University Tianjin China
| | - Kendall N. Houk
- Department of Chemistry and Biochemistry University of California Los Angeles, CA USA
| | - Aubry K. Miller
- Cancer Drug Development Group German Cancer Research Center (DKFZ) Heidelberg Germany
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Jänner S, Isak D, Li Y, Houk KN, Miller AK. Bioinspired Asymmetric Total Synthesis of Emeriones A–C. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sven Jänner
- German Cancer Research Centre: Deutsches Krebsforschungszentrum Cancer Drug Development GERMANY
| | - Daniel Isak
- German Cancer Research Centre: Deutsches Krebsforschungszentrum Cancer Drug Development GERMANY
| | - Yuli Li
- Tianjin University Department of Chemistry CHINA
| | - K. N. Houk
- UCLA: University of California Los Angeles Department of Chemistry and Biochemistry UNITED STATES
| | - Aubry Kern Miller
- German Cancer Research Center: Deutsches Krebsforschungszentrum Cancer Drug Development Im Neuenheimer Feld 280 69120 Heidelberg GERMANY
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Tantillo DJ. Drawing Polycyclic Molecules. ACS OMEGA 2021; 6:23008-23014. [PMID: 34549100 PMCID: PMC8444213 DOI: 10.1021/acsomega.1c03607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 08/11/2021] [Indexed: 06/13/2023]
Abstract
A personal perspective on the practice of drawing polycyclic molecules and its implications for understanding and undertaking chemistry is presented.
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Affiliation(s)
- Dean J. Tantillo
- University of California
− Davis, One Shields Avenue, Davis, California 95616, United States
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