1
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Yu IF, Wilson JW, Hartwig JF. Transition-Metal-Catalyzed Silylation and Borylation of C-H Bonds for the Synthesis and Functionalization of Complex Molecules. Chem Rev 2023; 123:11619-11663. [PMID: 37751601 DOI: 10.1021/acs.chemrev.3c00207] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
The functionalization of C-H bonds in organic molecules containing functional groups has been one of the holy grails of catalysis. One synthetically important approach to the diverse functionalization of C-H bonds is the catalytic silylation or borylation of C-H bonds, which enables a broad array of downstream transformations to afford diverse structures. Advances in both undirected and directed methods for the transition-metal-catalyzed silylation and borylation of C-H bonds have led to their rapid adoption in early-, mid-, and late-stage of the synthesis of complex molecules. In this Review, we review the application of the transition-metal-catalyzed silylation and borylation of C-H bonds to the synthesis of bioactive molecules, organic materials, and ligands. Overall, we aim to provide a picture of the state of art of the silylation and borylation of C-H bonds as applied to the synthesis and modification of diverse architectures that will spur further application and development of these reactions.
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Affiliation(s)
- Isaac F Yu
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jake W Wilson
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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2
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Jiang B, Dai M. Concise Total Syntheses of the 6-7-5 Hamigeran Natural Products. J Am Chem Soc 2023; 145:18731-18736. [PMID: 37603855 PMCID: PMC10472436 DOI: 10.1021/jacs.3c06031] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Indexed: 08/23/2023]
Abstract
Herein, we report the total syntheses of four hamigeran natural products featuring a 6-7-5 tricyclic carbon skeleton. We utilized a palladium-catalyzed intramolecular cyclopropanol ring opening cross-coupling to build the central seven-membered ring and a series of oxidations including a challenging aromatic C-H oxidation to introduce the peripheral functionalities. This approach enabled us to achieve the first total syntheses of hamigeran C (14 steps), debromohamigeran I (12 steps), and hamigeran I (13 steps). Our synthesis also resulted in hamigeran G in 13 steps, which is significantly shorter than the previously reported one (24 steps, longest linear sequence).
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Affiliation(s)
- Baiyang Jiang
- Department
of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mingji Dai
- Department
of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
- Department
of Chemistry and Department of Pharmacology and Chemical Biology, Emory University, Atlanta, Georgia 30322, United States
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3
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Okanishi Y, Ishikawa T, Jinnouchi T, Hayashi S, Takanami T, Aoyama H, Yoshimitsu T. Radical-Based Route to Functionalized Tetralin: Formal Total Synthesis of (±)-Hamigeran B. J Org Chem 2023; 88:1085-1092. [PMID: 36625755 DOI: 10.1021/acs.joc.2c02552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A formal synthetic route to hamigeran B, an antiviral marine natural product with a unique tricyclic molecular architecture, has been developed. The key chemical transformations in the present route include a novel zinc(II)porphyrin-catalyzed photoredox radical cascade cyclization to access a functionalized tetralin, a catalyst-free benzylic radical bromination with NBS by visible-light irradiation, and a samarium(II)-induced cyclization of brominated tetralone possibly via an orthoquinodimethane-like intermediate.
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Affiliation(s)
- Yusuke Okanishi
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Tohru Ishikawa
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Takuya Jinnouchi
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Satoshi Hayashi
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Toshikatsu Takanami
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita 565-0871, Osaka, Japan
| | - Takehiko Yoshimitsu
- Division of Pharmaceutical Sciences, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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4
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Patil VB, Jadhav SB, Nanubolu JB, Chegondi R. CuH-Catalyzed Enantioselective Desymmetrization of Cyclic 1,3-Diketones. Org Lett 2022; 24:8233-8238. [DOI: 10.1021/acs.orglett.2c03359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Vaibhav B. Patil
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sandip B. Jadhav
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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5
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Xiong Y, Chen YH, Li T, Xie JH, Zhou QL. Enantioselective Total Synthesis of (-)-Hamigeran F and Its Rearrangement Product. Org Lett 2022; 24:5161-5165. [PMID: 35816023 DOI: 10.1021/acs.orglett.2c01997] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report the first enantioselective total synthesis of the highly complex hamigeran diterpenoid (-)-hamigeran F and its rearrangement product. The synthetic strategy features key steps of asymmetric hydrogenation, Horner-Wadsworth-Emmons olefination, and intramolecular Friedel-Crafts acylation to construct the [6,6,5]-tricyclic skeleton bearing three consecutive stereocenters, a sequence of steps involving Rosenmund reduction, Wittig reaction, dihydroxylation to assemble the α-acetoxy ketone group, and an intramolecular aldol reaction to build the tetracyclic core structure.
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Affiliation(s)
- Ying Xiong
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yong-Hong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Tao Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jian-Hua Xie
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300070, China
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China.,Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300070, China
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6
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Zhang H, Zhu L, Feng J, Liu X, Chen X, Wu Q, Zhu D. Directed evolution of an alcohol dehydrogenase for the desymmetric reduction of 2,2-disubstituted cyclopenta-1,3-diones by enzymatic hydrogen transfer. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00559j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Directed evolution of carbonyl reductase TbADH created mutant Tb2 with balanced activity toward ethyl secodione and isopropanol, enabling the desymmetric reduction of ethyl secodione to give (13R,17S)-ethyl secol with 94% yield, >99% ee and >99% de.
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Affiliation(s)
- Hongliu Zhang
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
| | - Liangyan Zhu
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049 P.R. China
| | - Jinhui Feng
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
| | - Xiangtao Liu
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
| | - Xi Chen
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049 P.R. China
| | - Qiaqing Wu
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
| | - Dunming Zhu
- Tianjin Engineering Research Center of Biocatalytic Technology, National Engineering Research Center of Industrial Enzymes and National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences, Tianjin Airport Economic Area, 32 Xi Qi Dao, Tianjin 300308, P. R. China
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049 P.R. China
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7
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Nájera C, Foubelo F, Sansano JM, Yus M. Enantioselective desymmetrization reactions in asymmetric catalysis. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132629] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Jiang B, Dai M. 11-Step and Scalable Total Synthesis of Hamigeran M Enabled by Five C-H Functionalizations. J Am Chem Soc 2021; 143:20084-20089. [PMID: 34813320 DOI: 10.1021/jacs.1c11060] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the convergent total synthesis of (±)-hamigeran M, enabled by five C-H functionalization reactions and proceeding in 11 steps in 3.9% overall yield. The C-H functionalizations include a hydroxy-directed C-H borylation, one C-H metalation-1,2-addition, one C-H metalation-Negishi coupling, a late-stage oxazole-directed C-H borylation-oxidation, and one electrophilic bromination. Two of these five C-H functionalizations forged strategic C-C bonds in the seven-membered ring of hamigeran M. The oxazole-directed C-H borylation-oxidation was unprecedented and ensured a late-stage hydroxylation. Other key steps include a tandem Suzuki reaction-lactonization to join the cyclopentane building block with the aromatic moiety and a hydrogen-atom transfer reaction to reduce a challenging tetrasubstituted double bond.
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Affiliation(s)
- Baiyang Jiang
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mingji Dai
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
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9
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Wu GJ, Tan DX, Han FS. The Phosphinamide-Based Catalysts: Discovery, Methodology Development, and Applications in Natural Product Synthesis. Acc Chem Res 2021; 54:4354-4370. [PMID: 34784171 DOI: 10.1021/acs.accounts.1c00479] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In the total synthesis of natural products, synthetic efficiency has been an important driver for designing and developing new synthetic strategies and methodologies. To this end, the step, atom, and time economy and the overall yield are major factors to be considered. On the other hand, developing unified routes that can be used for synthesizing multiple molecules, specifically skeletally different classes of molecules, are also important aspects with which to be concerned. In the efforts toward efficient and flexible synthesis of structurally unique terpenoid and indole alkaloid natural products, we have designed and developed several phosphinamide-based new catalysts and reaction methodologies that have been compellingly demonstrated to be widely useful as strategic protocols for the diverse synthesis of various complex terpenoids and indole alkaloids. The important progress of these results will be summarized in this Account.In the first part, we present the stories of successful design and establishment of a novel method for the synthesis of P-stereogenic phosphinamides (P-SPhos) via a Pd-catalyzed C-H desymmetric enantioselective arylation, as well as the flexible derivatization of the P-stereogenic phosphinamides into various types of skeletally unique tricyclic and N,P-bidentate P-stereogenic compounds. Subsequently, the discovery of P-stereogenic phosphinamides as chiral organocatalysts for the desymmetric enantioselective reduction of cyclic 1,3-diketones and of phosphinamide-based cyclopalladium complex (C-Pd) as precatalysts for highly efficient Suzuki-Miyaura cross-coupling reaction of sterically congested nonactivated enolates is introduced. The notable features of the P-stereogenic phosphinamide-catalyzed desymmetric enantioselective reduction are highlighted by the broad substrate compatibility and excellent stereoselectivity, as well as most significantly, the good recoverability and reusability of catalysts. With regard to the sterically congested nonactivated enolates, such substrates are challenging for Suzuki cross-coupling reactions. We demonstrate that the phosphinamide-based cyclopalladium is a type of highly active precatalyst that allows the reaction to proceed under mild conditions and to be easily scaled up. Following the methodology development, the practical applications of these methods serving as strategic transformations are highlighted by the unified synthesis of four cyathane-type and two hamigeran-type terpenoids.In the second part, we describe the development of a robust method for oxidative Heck cross-coupling of indolyl amides by using the phosphinamide-based cyclopalladium as catalyst or phosphinamide as coligand. The method provides a general and straightforward method for diverse synthesis of indolyl δ-lactam derivatives, which present as a common core in a variety of Aspidosperma-derived indole alkaloids. The successful demonstration of this protocol for a concise and divergent synthesis of leuconodine-type indole alkaloids is also presented. We believe the results presented in this Account would have significant implications beyond our results and would find further applications in the field of synthetic methodology and natural product synthesis.
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Affiliation(s)
- Guo-Jie Wu
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin130022, China
| | - Dong-Xing Tan
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin130022, China
| | - Fu-She Han
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin130022, China
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10
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Qin XL, Wu GJ, Han FS. Enantioselective Total Synthesis and Absolute Configuration Assignment of (+)-Toxicodenane A. Org Lett 2021; 23:8570-8574. [PMID: 34652928 DOI: 10.1021/acs.orglett.1c03293] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We present the first enantioselective total synthesis and absolute configuration assignment of (+)-toxicodenane A via a nine-step sequence from the readily available material. The synthesis features a desymmetric enantioselective reduction of 2,2-disubstituted 1,3-cyclohexanedione for the synthesis of a chiral 2,2-disubstituted 3-hydroxy cyclohexanone building block, a highly diastereoselective Grignard reaction for the incorporation of an allyl group, and a Lewis acid-mediated intramolecular transacetalation and Prins cascade reaction for the construction of oxa-bridged bicyclic rings.
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Affiliation(s)
- Xu-Long Qin
- Key Lab of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Guo-Jie Wu
- Key Lab of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China.,Key Lab of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Fu-She Han
- Key Lab of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China.,University of Science and Technology of China, Hefei, Anhui 230026, China
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11
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Zong Y, Xu Z, Zhu R, Su A, Liu X, Zhu M, Han J, Zhang J, Xu Y, Lou H. Enantioselective Total Syntheses of Manginoids A and C and Guignardones A and C. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yan Zong
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Ze‐Jun Xu
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Rong‐Xiu Zhu
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
- School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China
| | - Ai‐Hong Su
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Xu‐Yuan Liu
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Ming‐Zhu Zhu
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Jing‐Jing Han
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Jiao‐Zhen Zhang
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Yu‐Liang Xu
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
| | - Hong‐Xiang Lou
- Department of Natural Products Chemistry Key Lab of Chemical Biology School of Pharmaceutical Sciences Shandong University Jinan 250012 China
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12
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Zong Y, Xu ZJ, Zhu RX, Su AH, Liu XY, Zhu MZ, Han JJ, Zhang JZ, Xu YL, Lou HX. Enantioselective Total Syntheses of Manginoids A and C and Guignardones A and C. Angew Chem Int Ed Engl 2021; 60:15286-15290. [PMID: 33876516 DOI: 10.1002/anie.202104182] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/19/2021] [Indexed: 12/23/2022]
Abstract
An enantioselective synthetic approach for preparing manginoids and guignardones, two types of biogenetically related meroterpenoids, is reported. This bioinspired and divergent synthesis employs an oxidative 1,3-dicarbonyl radical-initiated cyclization and cyclodehydration of the common precursor to forge the central ring of the manginoids and guignardones, respectively, at a late stage. Key synthetic steps include silica-gel-promoted semipinacol rearrangement to form the 6-oxabicyclo[3.2.1]octane skeleton and the Suzuki-Miyaura reaction of vinyl bromide to achieve fragment coupling. This synthesis protocol enables the asymmetric syntheses of four fungal meroterpenoids from commercially available materials.
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Affiliation(s)
- Yan Zong
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Ze-Jun Xu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Rong-Xiu Zhu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China.,School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
| | - Ai-Hong Su
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Xu-Yuan Liu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Ming-Zhu Zhu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Jing-Jing Han
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Jiao-Zhen Zhang
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Yu-Liang Xu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
| | - Hong-Xiang Lou
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, China
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13
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Kumar P, Shirke RP, Yadav S, Ramasastry SSV. Catalytic Enantioselective Synthesis of Axially Chiral Diarylmethylidene Indanones. Org Lett 2021; 23:4909-4914. [PMID: 34100619 DOI: 10.1021/acs.orglett.1c01671] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the first atropselective Suzuki-Miyaura cross-coupling of β-keto enol triflates to access axially chiral (Z)-diarylmethylidene indanones (DAIs). The chemical, physical, and biological properties of DAIs are unknown, despite their being structurally similar to arylidene indanones, primarily due to the lack of racemic or chiral methods. Through this work, we demonstrate a general and efficient protocol for the racemic as well as the atropselective synthesis of (Z)-DAIs. An unusual intramolecular Morita-Baylis-Hillman reaction is utilized for the Z-selective synthesis of β-keto enol triflates.
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Affiliation(s)
- Prashant Kumar
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S A S Nagar, Manauli PO, Punjab 140 306, India
| | - Rajendra P Shirke
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S A S Nagar, Manauli PO, Punjab 140 306, India
| | - Sonu Yadav
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S A S Nagar, Manauli PO, Punjab 140 306, India
| | - S S V Ramasastry
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S A S Nagar, Manauli PO, Punjab 140 306, India
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14
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Tabassum S, Zahoor AF, Ahmad S, Noreen R, Khan SG, Ahmad H. Cross-coupling reactions towards the synthesis of natural products. Mol Divers 2021; 26:647-689. [PMID: 33609222 DOI: 10.1007/s11030-021-10195-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 01/30/2021] [Indexed: 01/12/2023]
Abstract
Cross-coupling reactions are powerful synthetic tools for the formation of remarkable building blocks of many naturally occurring molecules, polymers and biologically active compounds. These reactions have brought potent transformations in chemical and pharmaceutical disciplines. In this review, we have focused on the use of cross-coupling reactions such as Suzuki, Negishi, Heck, Sonogashira and Stille in the total synthesis of some natural products of recent years (2016-2020). A short introduction of mentioned cross-coupling reactions along with highlighted aspects of natural products has been stated in separate sections. Additionally, few examples of natural products via incorporation of more than one type of cross-coupling reaction have also been added to demonstrate the importance of these reactions in organic synthesis.
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Affiliation(s)
- Shaheera Tabassum
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan.
| | - Sajjad Ahmad
- Department of Chemistry, University of Engineering and Technology, Lahore, Faisalabad Campus, Faisalabad, 38000, Pakistan
| | - Razia Noreen
- Department of Biochemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan
| | - Samreen Gul Khan
- Department of Chemistry, Government College University Faisalabad, Faisalabad, 38000, Pakistan
| | - Hamad Ahmad
- Department of Chemistry, University of Management and Technology, Lahore, Pakistan
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15
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Qin XL, Li A, Han FS. Desymmetric Enantioselective Reduction of Cyclic 1,3-Diketones Catalyzed by a Recyclable P-Chiral Phosphinamide Organocatalyst. J Am Chem Soc 2021; 143:2994-3002. [PMID: 33565311 DOI: 10.1021/jacs.1c00277] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The P-stereogenic phosphinamides are a structurally novel skeletal class which has not been investigated as chiral organocatalysts. However, chiral cyclic 3-hydroxy ketones are widely used as building blocks in the synthesis of natural products and bioactive compounds. However, general and practical methods for the synthesis of such chiral compounds remain underdeveloped. Herein, we demonstrate that the P-stereogenic phosphinamides are powerful organocatalysts for the desymmetric enantioselective reduction of cyclic 1,3-diketones, providing a useful method for the synthesis of chiral cyclic 3-hydroxy ketones. The protocol displays a broad substrate scope that is amenable to a series of cyclic 2,2-disubstituted five- and six-membered 1,3-diketones. The chiral cyclic 3-hydroxy ketone products bearing an all-carbon chiral quaternary center could be obtained with high enantioselectivities (up to 98% ee) and diastereoselectivities (up to 99:1 dr). Most importantly, the reactions could be practically performed on the gram scale and the catalysts could be reused without compromising the catalytic efficiency. Mechanistic studies revealed that an intermediate formed from P-stereogenic phosphinamide and catecholborane is the real catalytically active species. The results disclosed herein bode well for designing and developing other reactions using P-stereogenic phosphinamides as new organocatalysts.
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Affiliation(s)
- Xu-Long Qin
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, P. R. China.,University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Ang Li
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, P. R. China.,University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Fu-She Han
- CAS Key Lab of High-Performance Synthetic Rubber and its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, P. R. China.,University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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Ding Y, Zhu Z, Yu C, Zhou Y. Recent Advances in Reductive Desymmetrization of Diketones. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000536] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yi‐Xuan Ding
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zhou‐Hao Zhu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Chang‐Bin Yu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China
| | - Yong‐Gui Zhou
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China
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Synthesis and Biological Evaluation of Diversified Hamigeran B Analogs as Neuroinflammatory Inhibitors and Neurite Outgrowth Stimulators. Mar Drugs 2020; 18:md18060306. [PMID: 32545418 PMCID: PMC7345552 DOI: 10.3390/md18060306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/07/2020] [Accepted: 06/09/2020] [Indexed: 11/16/2022] Open
Abstract
We describe the efficient synthesis of a series of new simplified hamigeran B and 1-hydroxy-9-epi-hamigeran B norditerpenoid analogs (23 new members in all), structurally related to cyathane diterpenoid scaffold, and their anti-neuroinflammatory and neurite outgrowth-stimulating (neurotrophic) activity. Compounds 9a, 9h, 9o, and 9q exhibited moderate nerve growth factor (NGF)-mediated neurite-outgrowth promoting effects in PC-12 cells at the concentration of 20 μm. Compounds 9b, 9c, 9o, 9q, and 9t showed significant nitric oxide (NO) production inhibition in lipopolysaccharide (LPS)-activated BV-2 microglial cells, of which 9c and 9q were the most potent inhibitors, with IC50 values of 5.85 and 6.31 μm, respectively. Two derivatives 9q and 9o as bifunctional agents displayed good activities as NO production inhibitors and neurite outgrowth-inducers. Cytotoxicity experiments, H2O2-induced oxidative injury assay, and ELISA reaction speculated that compounds may inhibit the TNF-α pathway to achieve anti-inflammatory effects on nerve cells. Moreover, molecular docking studies provided a better understanding of the key structural features affecting the anti-neuroinflammatory activity and displayed significant binding interactions of some derivatives (like 9c, 9q) with the active site of iNOS protein. The structure-activity relationships (SARs) were also discussed. These results demonstrated that this structural class compounds offered an opportunity for the development of a new class of NO inhibitors and NGF-like promotors.
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Abstract
An approach toward the 6-7-5 tricyclic carbon skeleton of the hamigeran natural products was developed. The key steps include a benzyne-β-ketoester annulative ring expansion to form the 7-membered ring, a Nazarov reaction to form the 5-membered ring, a Ni-catalyzed conjugate methyl addition or a Corey-Chaykovsky reaction to install the all-carbon quaternary center, and a Suzuki cross coupling followed by reduction to introduce the isopropyl group.
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Affiliation(s)
- Baiyang Jiang
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
| | - Mingji Dai
- Department of Chemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47907, United States
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Li C, Li J, Zhou F, Li C, Wu W. Palladium-Catalyzed Cascade Annulation/Allylation of Alkynyl Oxime Ethers with Allyl Halides: Rapid Access to Fully Substituted Isoxazoles. J Org Chem 2019; 84:11958-11970. [PMID: 31464128 DOI: 10.1021/acs.joc.9b01593] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
A novel and efficient approach for the synthesis of functionalized isoxazoles via palladium-catalyzed cascade annulation/allylation of alkynyl oxime ethers with allyl halides has been established. The present protocol exhibits mild reaction conditions, good functional group compatibility, and convenient operation. Moreover, scalability was performed and further decoration of the isoxazole product was achieved.
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Zhang J, Han FS. Pd-Catalyzed Aerobic Oxidative Heck Cross-Coupling for the Straightforward Construction of Indole δ-Lactams. iScience 2019; 17:256-266. [PMID: 31319369 PMCID: PMC6637253 DOI: 10.1016/j.isci.2019.06.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/03/2019] [Accepted: 06/28/2019] [Indexed: 11/26/2022] Open
Abstract
The [6.5.6]-tricyclic indole δ-lactam represents a common key intermediate for the synthesis of a broad variety of structurally intriguing indole alkaloids. The development of a method for the versatile and straightforward construction of such structural motif is of great importance for potential synthetic applications. Herein, we present a co-ligand-prompted Pd-catalyzed 6-exo-trig intramolecular cyclization of indolyl amides via the aerobic oxidative Heck cross-coupling. The method provided a general and efficient way for the construction of [6.5.6]-tricyclic indole δ-lactams. A mechanistic study suggests that a Pd(I)/Pd(III) catalytic cycle should be responsible for effective coupling, which represents a mechanistically alternative pathway when compared with the Pd(0)/Pd(II) cycle proposed for other related coupling reactions.
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Affiliation(s)
- Jing Zhang
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China; The University of Chinese Academy of Sciences, Beijing 100864, China
| | - Fu-She Han
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China.
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Wu GJ, Zhang YH, Tan DX, He L, Cao BC, He YP, Han FS. Synthetic Studies on Enantioselective Total Synthesis of Cyathane Diterpenoids: Cyrneines A and B, Glaucopine C, and (+)-Allocyathin B2. J Org Chem 2019; 84:3223-3238. [DOI: 10.1021/acs.joc.8b03138] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guo-Jie Wu
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
| | - Yuan-He Zhang
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
- University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Dong-Xing Tan
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
- University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Long He
- Department of Chemical Engineering and Environment, Liaoning Shihua University, Fushun, Liaoning 113001, China
| | - Bao-Chen Cao
- Department of Chemical Engineering and Environment, Liaoning Shihua University, Fushun, Liaoning 113001, China
| | - Yu-Peng He
- Department of Chemical Engineering and Environment, Liaoning Shihua University, Fushun, Liaoning 113001, China
| | - Fu-She Han
- CAS Key Lab of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
- University of Science and Technology of China, Hefei, Anhui 230026, China
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Wang Q, Zhang T, Fan Y, Fan X. Synthesis of functionalized cyclopentenes through allenic ketone-based multicomponent reactions. Org Biomol Chem 2018; 16:8854-8858. [PMID: 30411769 DOI: 10.1039/c8ob02259c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A novel and efficient synthesis of diversely functionalized cyclopentene derivatives through the multicomponent reactions of 1,2-allenic ketones with 4-chloroacetoacetate and malononitrile/cyanoacetate under mild and metal-free conditions is presented. Mechanistically, the formation of title compounds involves a cascade process including nucleophilic substitution, Michael addition and intramolecular aldol type reaction. Interestingly, when 1-phenyl allenic ketones bearing electron-donating groups on the phenyl ring were reacted with 4-chloroacetoacetate and cyanoacetate, methylenecyclo-pentanes, the regioisomer of cyclopentenes, were formed with good selectivity and high efficiency.
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Affiliation(s)
- Qiang Wang
- College of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, Henan 454000, P. R. China.
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