1
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Godwin B, Anvari MH, Olfatbakhsh T, Mahbod M, Milani AS, DiLabio GA, Wulff JE. A Single-Atom Upgrade to Polydicyclopentadiene. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- Benjamin Godwin
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
| | - Monir H. Anvari
- Department of Chemistry, University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada
| | - Tina Olfatbakhsh
- Materials and Manufacturing Research Institute (MMRI), University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada
| | - Mahshid Mahbod
- Materials and Manufacturing Research Institute (MMRI), University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada
| | - Abbas S. Milani
- Materials and Manufacturing Research Institute (MMRI), University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada
| | - Gino A. DiLabio
- Department of Chemistry, University of British Columbia, Kelowna, British Columbia V1V 1V7, Canada
| | - Jeremy E. Wulff
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8W 3V6, Canada
- Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, Victoria, British Columbia V8W 2Y2, Canada
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
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2
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Lusi RF, Sennari G, Sarpong R. Strategy Evolution in a Skeletal Remodeling and C-H Functionalization-Based Synthesis of the Longiborneol Sesquiterpenoids. J Am Chem Soc 2022; 144:17277-17294. [PMID: 36098550 DOI: 10.1021/jacs.2c08136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Detailed herein are our synthesis studies of longiborneol and related natural products. Our overarching goals of utilizing a "camphor first" strategy enabled by skeletal remodeling of carvone, and late-stage diversification using C-H functionalizations, led to divergent syntheses of the target natural products. Our initial approach proposed a lithiate addition to unite two fragments followed by a Conia-ene or Pd-mediated cycloalkylation reaction sequence to install the seven-membered ring emblematic of the longibornane core. This approach was unsuccessful and evolved into a revised plan that employed a Wittig coupling and a radical cyclization to establish the core. A reductive radical cyclization, which was explored first, led to a synthesis of copaborneol, a structural isomer of longiborneol. Alternatively, a metal-hydride hydrogen atom transfer-initiated cyclization was effective for a synthesis of longiborneol. Late-stage C-H functionalization of the longibornane core led to a number of hydroxylated longiborneol congeners. The need for significant optimization of the strategies that were employed as well as the methods for C-H functionalization to implement these strategies highlights the ongoing challenges in applying these powerful reactions. Nevertheless, the reported approach enables functionalization of every natural product-relevant C-H bond in the longibornane skeleton.
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Affiliation(s)
- Robert F Lusi
- Department of Chemistry, University of California─Berkeley, Berkeley, California 94720, United States
| | - Goh Sennari
- Department of Chemistry, University of California─Berkeley, Berkeley, California 94720, United States.,O̅mura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
| | - Richmond Sarpong
- Department of Chemistry, University of California─Berkeley, Berkeley, California 94720, United States
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3
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Liu SH, Sun JL, Hu YL, Zhang L, Zhang X, Yan ZY, Guo X, Guo ZK, Jiao RH, Zhang B, Tan RX, Ge HM. Biosynthesis of Sordarin Revealing a Diels–Alderase for the Formation of the Norbornene Skeleton. Angew Chem Int Ed Engl 2022; 61:e202205577. [DOI: 10.1002/anie.202205577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Shuang He Liu
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Jia Li Sun
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Yi Ling Hu
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Li Zhang
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Xuan Zhang
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Zhang Yuan Yan
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Xing Guo
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Zhi Kai Guo
- Key Laboratory of Biology and Genetic Resources of Tropical Crops Ministry of Agriculture Institute of Tropical Bioscience and Bio-technology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China
| | - Rui Hua Jiao
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Bo Zhang
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Ren Xiang Tan
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
| | - Hui Ming Ge
- State Key Laboratory of Pharmaceutical Biotechnology Institute of Functional Biomolecules Chemistry and Biomedicine Innovation Center (ChemBIC) School of Life Sciences Nanjing University Nanjing 210023 China
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4
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Ge HM, Liu SH, Sun JL, Hu YL, Zhang L, Zhang X, Yan ZY, Guo X, Guo ZK, Jiao RH, Zhang B, Tan RX. Biosynthesis of Sordarin Revealing a Diels‐Alderase for the Formation of the Norbornene Skeleton. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205577] [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)
- Hui Ming Ge
- Nanjing University School of Lifescience 22 Hankou Road 210093 Nanjing CHINA
| | | | - Jia Li Sun
- Nanjing University School of Life Science CHINA
| | - Yi Ling Hu
- Nanjing University School of Life Science CHINA
| | - Li Zhang
- Nanjing University School of Life Science CHINA
| | - Xuan Zhang
- Nanjing University School of Life Science CHINA
| | | | - Xing Guo
- Nanjing University School of Life Science CHINA
| | - Zhi Kai Guo
- Chinese Academy of Tropical Agricultural Sciences Key Laboratory of Biology and Genetic Resources of Tropical Crops CHINA
| | | | - Bo Zhang
- Nanjing University School of Life Science xianlin No163, Jiangsu, ChinaJiangsu, China 210023 nanjing CHINA
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5
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Discovery and characterization of a terpene biosynthetic pathway featuring a norbornene-forming Diels-Alderase. Nat Commun 2022; 13:2568. [PMID: 35546152 PMCID: PMC9095873 DOI: 10.1038/s41467-022-30288-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 04/25/2022] [Indexed: 11/17/2022] Open
Abstract
Pericyclases, enzymes that catalyze pericyclic reactions, form an expanding family of enzymes that have biocatalytic utility. Despite the increasing number of pericyclases discovered, the Diels-Alder cyclization between a cyclopentadiene and an olefinic dienophile to form norbornene, which is among the best-studied cycloadditions in synthetic chemistry, has surprisingly no enzymatic counterpart to date. Here we report the discovery of a pathway featuring a norbornene synthase SdnG for the biosynthesis of sordaricin-the terpene precursor of antifungal natural product sordarin. Full reconstitution of sordaricin biosynthesis reveals a concise oxidative strategy used by Nature to transform an entirely hydrocarbon precursor into the highly functionalized substrate of SdnG for intramolecular Diels-Alder cycloaddition. SdnG generates the norbornene core of sordaricin and accelerates this reaction to suppress host-mediated redox modifications of the activated dienophile. Findings from this work expand the scopes of pericyclase-catalyzed reactions and P450-mediated terpene maturation. Pericyclase enzymes are an expanding family of enzymes. Here, the authors identify the norbornene synthase SdnG, a pericyclase for the intramolecular Diels-Alder reaction between a cyclopentadiene and an olefinic dienophile to form the sordaricin norbornene structure, and reconstitute the sordaricin biosynthesis.
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6
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Chen Q, Yuan G, Yuan T, Zeng H, Zou ZR, Tu ZC, Gao J, Zou Y. Set of Cytochrome P450s Cooperatively Catalyzes the Synthesis of a Highly Oxidized and Rearranged Diterpene-Class Sordarinane Architecture. J Am Chem Soc 2022; 144:3580-3589. [PMID: 35170947 DOI: 10.1021/jacs.1c12427] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cytochrome P450s are one of the most versatile oxidases that catalyze significant and unique chemical transformations for the construction of complex structural frameworks during natural product biosynthesis. Here, we discovered a set of P450s, including SdnB, SdnH, SdnF, and SdnE, that cooperatively catalyzes the reshaping of the inert cycloaraneosene framework to form a highly oxidized and rearranged sordarinane architecture. Among them, SdnB is confirmed to be the first P450 (or oxidase) that cleaves the C-C bond of the epoxy residue to yield formyl groups in pairs. SdnF selectively oxidizes one generated formyl group to a carboxyl group and accelerates the final Diels-Alder cyclization to furnish the sordarinane architecture. Our work greatly enriches the enzyme functions of the P450 superfamily, supplies the missing skills of the P450 synthetic toolbox, and supports them as biocatalysts in further applications toward the synthesis of new chemical entities.
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Affiliation(s)
- Qibin Chen
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Guanyin Yuan
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, P. R. China
| | - Tao Yuan
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Huiting Zeng
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Zheng-Rong Zou
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Zong-Cai Tu
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie Gao
- College of Life Sciences, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Yi Zou
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, P. R. China
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7
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Wu WB, Mu BS, Yu JS, Zhou J. Me 2(CH 2CH)SiCN: a bifunctional ethylene equivalent for Diels–Alder reaction based controllable tandem synthesis. Chem Sci 2022; 13:3519-3525. [PMID: 35432855 PMCID: PMC8943849 DOI: 10.1039/d2sc00147k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 02/24/2022] [Indexed: 01/06/2023] Open
Abstract
A bifunctional silyl reagent Me2(CH2CH)SiCN has been developed as a novel ethylene equivalent for the Diels–Alder (DA) reaction. The use of this reagent enables the controllable synthesis of value-added cyclohexenyl ketones or 2-acyl cyclohexancarbonitrile derivatives through a five- or six-step tandem sequence based on a Wittig/cyanosilylation/DA reaction/retro-cyanosilylation/isomerization sequence that involves a temporary silicon-tethered intramolecular DA reaction. We report an unprecedented tandem Wittig/cyanosilylation/DA reaction/retro-cyanosilylation/isomerization sequence by using our designed bifunctional ethylene equivalent Me2(CH2CH)SiCN.![]()
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Affiliation(s)
- Wen-Biao Wu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, China
| | - Bo-Shuai Mu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, China
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Hainan Normal University, Haikou 571158, China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, China
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Hainan Normal University, Haikou 571158, China
- Institute of Eco-Chongming, Shanghai 202162, China
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8
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Pacherille A, Tuga B, Hallooman D, Dos Reis I, Vermette M, Issack BB, Rhyman L, Ramasami P, Sunasee R. BiCl 3-Facilitated removal of methoxymethyl-ether/ester derivatives and DFT study of –O–C–O– bond cleavage. NEW J CHEM 2021. [DOI: 10.1039/d1nj00449b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An experimental and DFT study of the cleavage of the MOM group mediated by an eco-friendly reagent, bismuth trichloride.
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Affiliation(s)
- Angela Pacherille
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Beza Tuga
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Dhanashree Hallooman
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
| | - Isaac Dos Reis
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
| | - Mélodie Vermette
- Département des Sciences Expérimentales
- Université de Saint-Boniface
- Winnipeg
- Canada
| | - Bilkiss B. Issack
- Département des Sciences Expérimentales
- Université de Saint-Boniface
- Winnipeg
- Canada
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
- Department of Chemical Sciences
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry
- Faculty of Science, University of Mauritius
- Réduit 80837
- Mauritius
- Department of Chemical Sciences
| | - Rajesh Sunasee
- Department of Chemistry
- State University of New York at Plattsburgh
- Plattsburgh
- USA
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9
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Harned AM, Stoltz BM. Development of a catalytic enantioselective synthesis of the guanacastepene and heptemerone tricyclic core. Tetrahedron 2019; 75:3166-3177. [PMID: 31937979 PMCID: PMC6959853 DOI: 10.1016/j.tet.2019.02.053] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
For nearly two decades, synthetic chemists have been fascinated by the structural complexity and synthetic challenges afforded by the guanacastepene and heptemerone diterpenoids.Numerous synthetic approaches to these compounds have been reported, but to date the application of enantioselective catalysis to this problem has not been realized. Herein we report an enantioselective synthesis of an advanced intermediate corresponding to the tricyclic core common to the guanacastepenes and heptemerones. Highlights of this work include sequential Pd-catalyzed decarboxylative allylic alkylation reactions to generate the two all carbon quaternary stereocenters, the use of ring-closing metathesis to close the A ring in the presence of a distal allyl sidechain, and a region and diastereoselective oxidation of an trienol ether to introduce oxygenation on the A ring.
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Affiliation(s)
- Andrew M Harned
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
- Department of Chemistry & Biochemistry, Texas Tech University, 1204 Boston Ave, Lubbock, Texas 79409, United States
| | - Brian M Stoltz
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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10
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Chang X, Sun XS, Che C, Hu YZ, Tao HY, Wang CJ. Copper(I)-Catalyzed Kinetic Resolution of exo-3-Oxodicyclopentadienes and endo-3-Oxodicyclopentadiene. Org Lett 2019; 21:1191-1196. [PMID: 30707591 DOI: 10.1021/acs.orglett.9b00136] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first example of highly efficient kinetic resolution of exo-3-oxodicyclopentadienes and endo-3-oxodicyclopentadiene has been developed by means of Cu(I)-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylide. Compared with the existing methodologies for those synthetically important optically active convex molecules, the current protocol provides an alternative but more practical approach from the readily available racemic starting materials, which is free from the repetitive reduction/oxidation steps in the enzymatic resolution or the indispensable stoichiometric amount of chirality-induction reagents.
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Affiliation(s)
- Xin Chang
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Xi-Shang Sun
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Chao Che
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Yuan-Zheng Hu
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China.,State Key Laboratory of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China
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11
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Nagatani K, Hoshino Y, Tezuka H, Nakada M. Enantioselective preparation of C-ring fragment of cotylenin A via catalytic asymmetric intramolecular cyclopropanation of α-diazo β-keto ester. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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12
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Genome mining of the sordarin biosynthetic gene cluster from Sordaria araneosa Cain ATCC 36386: characterization of cycloaraneosene synthase and GDP-6-deoxyaltrose transferase. J Antibiot (Tokyo) 2016; 69:541-8. [PMID: 27072286 DOI: 10.1038/ja.2016.40] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 03/04/2016] [Accepted: 03/13/2016] [Indexed: 01/24/2023]
Abstract
Sordarin is a glycoside antibiotic with a unique tetracyclic diterpene aglycone structure called sordaricin. To understand its intriguing biosynthetic pathway that may include a Diels-Alder-type [4+2]cycloaddition, genome mining of the gene cluster from the draft genome sequence of the producer strain, Sordaria araneosa Cain ATCC 36386, was carried out. A contiguous 67 kb gene cluster consisting of 20 open reading frames encoding a putative diterpene cyclase, a glycosyltransferase, a type I polyketide synthase, and six cytochrome P450 monooxygenases were identified. In vitro enzymatic analysis of the putative diterpene cyclase SdnA showed that it catalyzes the transformation of geranylgeranyl diphosphate to cycloaraneosene, a known biosynthetic intermediate of sordarin. Furthermore, a putative glycosyltransferase SdnJ was found to catalyze the glycosylation of sordaricin in the presence of GDP-6-deoxy-d-altrose to give 4'-O-demethylsordarin. These results suggest that the identified sdn gene cluster is responsible for the biosynthesis of sordarin. Based on the isolated potential biosynthetic intermediates and bioinformatics analysis, a plausible biosynthetic pathway for sordarin is proposed.
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13
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Büschleb M, Dorich S, Hanessian S, Tao D, Schenthal KB, Overman LE. Synthetic Strategies toward Natural Products Containing Contiguous Stereogenic Quaternary Carbon Atoms. Angew Chem Int Ed Engl 2016; 55:4156-86. [PMID: 26836448 PMCID: PMC4865016 DOI: 10.1002/anie.201507549] [Citation(s) in RCA: 251] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Indexed: 11/06/2022]
Abstract
Strategies for the total synthesis of complex natural products that contain two or more contiguous stereogenic quaternary carbon atoms in their intricate structures are reviewed with 12 representative examples. Emphasis has been put on methods to create quaternary carbon stereocenters, including syntheses of the same natural product by different groups, thereby showcasing the diversity of thought and individual creativity. A compendium of selected natural products containing two or more contiguous stereogenic quaternary carbon atoms and key reactions in their total or partial syntheses is provided in the Supporting Information.
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Affiliation(s)
- Martin Büschleb
- Department of Chemistry, Université de Montréal, Station Centre-Ville, C. P. 6128, Montréal, Qc, H3C 3J7, Canada
| | - Stéphane Dorich
- Department of Chemistry, Université de Montréal, Station Centre-Ville, C. P. 6128, Montréal, Qc, H3C 3J7, Canada
| | - Stephen Hanessian
- Department of Chemistry, Université de Montréal, Station Centre-Ville, C. P. 6128, Montréal, Qc, H3C 3J7, Canada.
| | - Daniel Tao
- Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine, CA, 92697-2025, USA
| | - Kyle B Schenthal
- Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine, CA, 92697-2025, USA
| | - Larry E Overman
- Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine, CA, 92697-2025, USA
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14
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Büschleb M, Dorich S, Hanessian S, Tao D, Schenthal KB, Overman LE. Strategien für die Synthese von Naturstoffen mit benachbarten stereogenen quartären Kohlenstoffatomen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201507549] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Martin Büschleb
- Department of Chemistry; Université de Montréal, Station Centre-Ville; C. P. 6128 Montréal Qc H3C 3J7 Kanada
| | - Stéphane Dorich
- Department of Chemistry; Université de Montréal, Station Centre-Ville; C. P. 6128 Montréal Qc H3C 3J7 Kanada
| | - Stephen Hanessian
- Department of Chemistry; Université de Montréal, Station Centre-Ville; C. P. 6128 Montréal Qc H3C 3J7 Kanada
| | - Daniel Tao
- Department of Chemistry; University of California; 1102 Natural Sciences II Irvine CA 92697-2025 USA
| | - Kyle B. Schenthal
- Department of Chemistry; University of California; 1102 Natural Sciences II Irvine CA 92697-2025 USA
| | - Larry E. Overman
- Department of Chemistry; University of California; 1102 Natural Sciences II Irvine CA 92697-2025 USA
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15
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Jany T, Horstmann née Gruschka C, Bögge H, Stammler A, Glaser T. A Series of Dinuclear Complexes with a Flexible Naphthalene-Spacer and MOM-Cleavage by Pre-coordinated Lewis Acids. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500553] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Zhang J, Liu X, Wang R. Magnesium Complexes as Highly Effective Catalysts for Conjugate Cyanation of α,β-Unsaturated Amides and Ketones. Chemistry 2014; 20:4911-5. [DOI: 10.1002/chem.201304835] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 01/24/2014] [Indexed: 11/11/2022]
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17
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Clergue S, Vasse JL. Sequential Hydrozirconation/Cyclization of Dienes, a New Route toward Trans 2-Substituted Vinylcyclopentanes. Org Lett 2014; 16:1506-9. [DOI: 10.1021/ol500400s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sébastien Clergue
- Institut de Chimie Moléculaire
de Reims, CNRS (UMR 7312) and Université de Reims, 51687 Reims Cedex 2, France
| | - Jean-Luc Vasse
- Institut de Chimie Moléculaire
de Reims, CNRS (UMR 7312) and Université de Reims, 51687 Reims Cedex 2, France
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18
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Krüger S, Gaich T. Recent applications of the divinylcyclopropane-cycloheptadiene rearrangement in organic synthesis. Beilstein J Org Chem 2014; 10:163-93. [PMID: 24605138 PMCID: PMC3943923 DOI: 10.3762/bjoc.10.14] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 11/11/2013] [Indexed: 12/03/2022] Open
Abstract
This review summarizes the application of the divinylcyclopropane–cycloheptadiene rearrangement in synthetic organic chemistry. A brief overview of the new mechanistic insights concerning the title reaction is provided as well as a condensed account on the biological relevance of the topic. Heteroatom variants of this rearrangement are covered briefly.
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Affiliation(s)
- Sebastian Krüger
- Institut für Organische Chemie, Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | - Tanja Gaich
- Institut für Organische Chemie, Leibniz Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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Hale KJ, Grabski M, Flasz JT. A New Mild Method for the C-Acylation of Ketone Enolates. A Convenient Synthesis of β-Keto-Esters, -Thionoesters, and -Thioesters. Org Lett 2012; 15:370-3. [DOI: 10.1021/ol303324a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Karl J. Hale
- The School of Chemistry and Chemical Engineering, and the CCRCB, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, U.K
| | - Milosz Grabski
- The School of Chemistry and Chemical Engineering, and the CCRCB, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, U.K
| | - Jakub T. Flasz
- The School of Chemistry and Chemical Engineering, and the CCRCB, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, U.K
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20
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Provencher BA, Bartelson KJ, Liu Y, Foxman BM, Deng L. Structural Study-Guided Development of Versatile Phase-Transfer Catalysts for Asymmetric Conjugate Additions of Cyanide. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105536] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Provencher BA, Bartelson KJ, Liu Y, Foxman BM, Deng L. Structural study-guided development of versatile phase-transfer catalysts for asymmetric conjugate additions of cyanide. Angew Chem Int Ed Engl 2011; 50:10565-9. [PMID: 21919177 DOI: 10.1002/anie.201105536] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Brian A Provencher
- Department of Chemistry, Brandeis University, Waltham, MA 02454-9110, USA
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22
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Michalak M, Michalak K, Urbanczyk-Lipkowska Z, Wicha J. Synthetic Studies on Dicyclopenta[a,d]cyclooctane Terpenoids: Construction of the Core Structure of Fusicoccins and Ophiobolins on the Route Involving a Wagner-Meerwein Rearrangement. J Org Chem 2011; 76:7497-509. [DOI: 10.1021/jo201357p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michał Michalak
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Karol Michalak
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Zofia Urbanczyk-Lipkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Jerzy Wicha
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw, Poland
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23
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Fujioka H, Minamitsuji Y, Kubo O, Senami K, Maegawa T. The reaction of acetal-type protective groups in combination with TMSOTf and 2,2′-bipyridyl; mild and chemoselective deprotection and direct conversion to other protective groups. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.02.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Yang J, Chen F. Highly Efficient Syntheses of β-Cyanoketones via Conjugate Addition of Me3SiCN to Aromatic Enones. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090182] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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26
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Han JH, Kwon YE, Sohn JH, Ryu DH. A facile method for the rapid and selective deprotection of methoxymethyl (MOM) ethers. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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27
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Schwartz BD, Denton JR, Bernhardt PV, Davies HML, Williams CM. Towards the Total Synthesis of 3-Hydroxyvibsanin E. SYNTHESIS-STUTTGART 2009; 2009:2840-2846. [PMID: 20725592 PMCID: PMC2921946 DOI: 10.1055/s-0029-1216912] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Brett D. Schwartz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072, Queensland, Australia
| | - Justin R. Denton
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072, Queensland, Australia
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia, 30322, USA
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072, Queensland, Australia
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28
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Schwartz BD, Denton JR, Lian Y, Davies HML, Williams CM. Asymmetric [4 + 3] cycloadditions between vinylcarbenoids and dienes: application to the total synthesis of the natural product (-)-5-epi-vibsanin E. J Am Chem Soc 2009; 131:8329-32. [PMID: 19445507 PMCID: PMC2717789 DOI: 10.1021/ja9019484] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The total synthesis of (-)-5-epi-vibsanin E (2) has been achieved in 18 steps. The synthesis combines the rhodium-catalyzed [4 + 3] cycloaddition between a vinylcarbenoid and a diene to rapidly generate the tricyclic core with an effective end game strategy to introduce the remaining side-chains. The [4 + 3] cycloaddition occurs by a cyclopropanation to form a divinylcyclopropane followed by a Cope rearrangement to form a cycloheptadiene. The quaternary stereogenic center generated in the process can be obtained with high asymmetric induction when the reaction is catalyzed by the chiral dirhodium complex, Rh(2)(S-PTAD)(4).
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Affiliation(s)
- Brett D. Schwartz
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Queensland, Australia
| | - Justin R. Denton
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
| | - Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Queensland, Australia
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29
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Facial selectivity in addition reactions to the highly strained enone in tricyclo[5.2.1.02,6]deca-2(6),8-dienone and tricyclo[5.2.1.02,6]dec-2(6)-enone. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Schulé A, Liang H, Vors JP, Ciufolini MA. Synthetic Studies toward Sordarin: Building Blocks for the Terpenoid Core and for Analogues Thereof. J Org Chem 2009; 74:1587-97. [DOI: 10.1021/jo801911s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arnaud Schulé
- Laboratoire de Synthèse et Méthodologie Organiques, CNRS UMR 5181, Université Claude Bernard Lyon 1 and Ecole Supérieure de Chimie, Physique, Electronique de Lyon, 43, Bd. du 11 Novembre 1918, 69622 Villeurbanne, France, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada, and Bayer CropScience SA, Rue Pierre Baizet, 69005 Lyon, France
| | - Huan Liang
- Laboratoire de Synthèse et Méthodologie Organiques, CNRS UMR 5181, Université Claude Bernard Lyon 1 and Ecole Supérieure de Chimie, Physique, Electronique de Lyon, 43, Bd. du 11 Novembre 1918, 69622 Villeurbanne, France, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada, and Bayer CropScience SA, Rue Pierre Baizet, 69005 Lyon, France
| | - Jean-Pierre Vors
- Laboratoire de Synthèse et Méthodologie Organiques, CNRS UMR 5181, Université Claude Bernard Lyon 1 and Ecole Supérieure de Chimie, Physique, Electronique de Lyon, 43, Bd. du 11 Novembre 1918, 69622 Villeurbanne, France, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada, and Bayer CropScience SA, Rue Pierre Baizet, 69005 Lyon, France
| | - Marco A. Ciufolini
- Laboratoire de Synthèse et Méthodologie Organiques, CNRS UMR 5181, Université Claude Bernard Lyon 1 and Ecole Supérieure de Chimie, Physique, Electronique de Lyon, 43, Bd. du 11 Novembre 1918, 69622 Villeurbanne, France, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada, and Bayer CropScience SA, Rue Pierre Baizet, 69005 Lyon, France
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31
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Thansandote P, Hulcoop DG, Langer M, Lautens M. Palladium-Catalyzed Annulation of Haloanilines and Halobenzamides Using Norbornadiene as an Acetylene Synthon: A Route to Functionalized Indolines, Isoquinolinones, and Indoles. J Org Chem 2009; 74:1673-8. [DOI: 10.1021/jo802604g] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Praew Thansandote
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - David G. Hulcoop
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Michael Langer
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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32
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Schwartz BD, Denton JR, Davies HML, Williams CM. Total Synthesis of (±)-Vibsanin E. Aust J Chem 2009; 62:980-982. [PMID: 21297900 DOI: 10.1071/ch09267] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Vibsanin E (1), a structurally rare complex diterpene, consisting of a compact 3-oxatricyclo[6.3.2.05,10] tridecane core and an unprecedented 3,3-dimethylacroyl enol ester functional group, formulate a considerable synthetic challenge. Williams and Davies failed to independently synthesize this nemesis, however, a ‘two heads are better than one’ approach delivered the first total synthesis of the molecule, since its diamond aniversary isolation.
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Affiliation(s)
- Brett D Schwartz
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072, Queensland, Australia
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33
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Volkers AA, Klunder AJ, Zwanenburg B. Alkylations of tricyclo[5.2.1.02,6]deca-4,8-dien-3-one by a cuprate reaction. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.10.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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34
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Fujioka H, Kubo O, Senami K, Minamitsuji Y, Maegawa T. Remarkable effect of 2,2′-bipyridyl: mild and highly chemoselective deprotection of methoxymethyl (MOM) ethers in combination with TMSOTf (TESOTf)–2,2′-bipyridyl. Chem Commun (Camb) 2009:4429-31. [DOI: 10.1039/b907910f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Fleming FF, Gudipati S. Cyclic Metalated Nitriles: Stereoselective Cyclizations to cis- and trans-Hydrindanes, Decalins, and Bicyclo[4.3.0]undecanes. European J Org Chem 2008; 2008:10.1002/ejoc.200800715. [PMID: 24260015 PMCID: PMC3831376 DOI: 10.1002/ejoc.200800715] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Indexed: 11/07/2022]
Abstract
Metalated nitriles are nucleophilic chameleons whose precise identity is determined by the nature of the metal, the solvent, the temperature, and the structure of the nitrile. The review surveys the different structural types and their cyclization trajectories to show how to selectively tune the metalated nitrile geometry for stereoselective cyclizations to a variety of cis or trans hydrindanes, decalins, and bicyclo[4.3.0]undecanes.
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Affiliation(s)
- Fraser F. Fleming
- Department of Chemistry and Biochemistry, Mellon Hall, Duquesne University, Pittsburgh PA 15282-1530, USA
| | - Subramanyham Gudipati
- Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, N.J. 07033-0530, USA Fax: +1-908-740-7441
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36
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Liang H. Sordarin, an antifungal agent with a unique mode of action. Beilstein J Org Chem 2008; 4:31. [PMID: 18941619 PMCID: PMC2568878 DOI: 10.3762/bjoc.4.31] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Accepted: 08/26/2008] [Indexed: 11/23/2022] Open
Abstract
The sordarin family of compounds, characterized by a unique tetracyclic diterpene core including a norbornene system, inhibits protein synthesis in fungi by stabilizing the ribosome/EF2 complex. This mode of action is in contrast to typical antifungals, which target the cell membrane. This unusual bioactivity makes sordarin a promising candidate for the development of new fungicidal agents, and provided the motivation for extensive research. Three total syntheses (by the Kato, Mander and Narasaka groups), modifications of the glycosyl unit, and changes to the diterpene core (Cuevas and Ciufolini models) will also be discussed in this review.
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Affiliation(s)
- Huan Liang
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
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Pongcharoen W, Rukachaisirikul V, Phongpaichit S, Kühn T, Pelzing M, Sakayaroj J, Taylor WC. Metabolites from the endophytic fungus Xylaria sp. PSU-D14. PHYTOCHEMISTRY 2008; 69:1900-1902. [PMID: 18495187 DOI: 10.1016/j.phytochem.2008.04.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Revised: 04/01/2008] [Accepted: 04/04/2008] [Indexed: 05/26/2023]
Abstract
Glucoside derivatives, xylarosides A (1) and B (2), were isolated from the broth extract of the endophytic fungus Xylaria sp. PSU-D14 along with two known compounds, sordaricin (3) and 2,3-dihydro-5-hydroxy-2-methyl-4H-1-benzopyran-4-one (4). The structures were assigned by spectroscopic methods. Sordaricin (3), one of the known metabolites, exhibited moderate antifungal activity against Candida albicans ATCC90028 with a MIC value of 32 microg/ml.
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Affiliation(s)
- Wipapan Pongcharoen
- Department of Chemistry, Faculty of Science, Prince of Songkla University, Songkhla 90112, Thailand
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Liang H, Schulé A, Vors JP, Ciufolini MA. An Avenue to the Sordarin Core Adaptable to Analog Synthesis. Org Lett 2007; 9:4119-22. [PMID: 17880227 DOI: 10.1021/ol701547r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe a synthesis of ketones 3 (X = O-R or CN; Y = H or alkyl), which are useful building blocks for the preparation of analogs of the potent antifungal agent sordarin, 1. Congeners of 1 constructed from 3 should permit detailed SAR investigations of the terpenoid core of the natural product.
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Affiliation(s)
- Huan Liang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
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40
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Abstract
The first total synthesis of (-)-sordarin (1) was accomplished exploiting the following key reactions: (i) Ag(I)-catalyzed oxidative radical cyclization of a cyclopropanol derivative leading to a bicyclo[5.3.0]decan-3-one skeleton; (ii) Pd(0)-catalyzed intramolecular allylation reaction resulting in the entire strained bicyclo[2.2.1]heptan-2-one framework of sordaricin (2); (iii) selective dihydroxylation of terminal alkenes by the combined use of OsO(4) and PhB(OH)(2); and (iv) beta(1,2-cis)-selective glycosidation via a 1,3-anchimeric assistance from a 4-methoxybenzoyl group.
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Affiliation(s)
- Shunsuke Chiba
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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41
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Wilson MS, Woo JCS, Dake GR. A Synthetic Approach toward Nitiol: Construction of Two 1,22-Dihydroxynitianes. J Org Chem 2006; 71:4237-45. [PMID: 16709067 DOI: 10.1021/jo0604585] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthetic work toward the total synthesis of nitiol has culminated in the construction of two epimeric hydroxylated derivatives, the 1,22-dihydroxynitianes. Key stereodefining steps in the construction of the A-ring fragment (13) were the use of a siloxy-epoxide rearrangement reaction, a Pauson-Khand reaction, a Norrish 1 photochemical cleavage reaction, and a highly regio- and stereoselective hydrostannylation reaction of an ynoate. The stereochemistry of the synthetically challenging C-ring fragment (20) was established using an Ireland-Claisen reaction and a Grubbs ring-closing metathesis process as key steps. The 12-membered B-ring of the nitiane skeleton was constructed using a copper-promoted Stille cross-coupling and a Kishi-Hiyama-Nozaki carbonyl addition reaction. Unfortunately, the carbonyl addition reaction produced hydroxyl functionality that could not be selectively removed. Consequently, a synthesis of epimeric 1,22-dihydroxynitianes, which are compounds that are structural hybrids of two natural products, nitiol and variculanol, was completed.
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Affiliation(s)
- Michael S Wilson
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, B.C., Canada V6T 1Z1
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Abstract
This review covers the isolation and structures of diterpenoids, including labdanes, clerodanes,pimaranes, abietanes, kauranes, cembranolides, taxanes and marine diterpenoids. The literature from January to December 2005 is reviewed, and 195 references are cited.
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Affiliation(s)
- James R Hanson
- Department of Chemistry, University of Sussex, Brighton, Sussex BN1 9QJ, UK
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