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Gulbrandsen HS, Serigstad H, Lovell Read M, Joos I, Gundersen LL. Formation of 8-Hydroxyphenanthridines by Microwave-Mediated IMDAF Reactions; Synthesis Directed towards Lycorine Alkaloids. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901000] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Halvard Serigstad
- Department of Chemistry; University of Oslo; P. O. Box 1033, Blindern 0315 Oslo Norway
| | - Matthew Lovell Read
- Department of Chemistry; University of Oslo; P. O. Box 1033, Blindern 0315 Oslo Norway
| | - Ilah Joos
- Department of Chemistry; University of Oslo; P. O. Box 1033, Blindern 0315 Oslo Norway
| | - Lise-Lotte Gundersen
- Department of Chemistry; University of Oslo; P. O. Box 1033, Blindern 0315 Oslo Norway
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2
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Jo M, Lee D, Kwak YS. Rapid Access to the Structural Core of Aflavinines via Stereoselective Tandem Intramolecular Diels-Alder Cycloaddition Controlled by the Allylic 1,3-Strain. Org Lett 2019; 21:6529-6533. [PMID: 31368715 DOI: 10.1021/acs.orglett.9b02457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An expedient route to access the functionalized structural core of aflavinines has been developed starting from three readily available fragments over 12 steps in 29.1% overall yield without using any transition metal catalysis. The key feature of this approach is a tandem intramolecular Diels-Alder cycloaddition to complete the hexacyclic framework with the correct stereochemistry and all the requisite structural elements in place to achieve the total synthesis of aflavinine and its congeners.
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Affiliation(s)
- Minmi Jo
- College of Pharmacy , Korea University , Sejong 30019 , Republic of Korea
| | - Dongjoo Lee
- College of Pharmacy and Research Institute of Pharmaceutical Science and Technology (RIPST) , Ajou University , Suwon 16499 , Republic of Korea
| | - Young-Shin Kwak
- College of Pharmacy , Korea University , Sejong 30019 , Republic of Korea
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3
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Wu X, Wang HJ, Huang YS, Li WDZ. Intramolecular [2 + 2] Cycloadditions of Alkyl(phenylthio)ketenes: Total Synthesis of (+)-Sphaerodiol. Org Lett 2018. [PMID: 29533070 DOI: 10.1021/acs.orglett.8b00407] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Asymmetric total synthesis of (+)-sphaerodiol (2) has been achieved. A key step is an intramolecular [2 + 2] cycloaddition of alkyl(phenylthio)ketene for rapid assembly of the decalin ring.
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Affiliation(s)
- Xiang Wu
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Hai-Jun Wang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Yong-Shuang Huang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, School of Chemistry and Chemical Engineering , Hefei University of Technology , Hefei 230009 , China
| | - Wei-Dong Z Li
- School of Life Science and Engineering , Southwest Jiaotong University , Chengdu 610031 , China
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Abstract
A new hypothetic biosynthesis of the tricyclic spiroketal core of ascospiroketals A and B is proposed, which guided the development of a novel synthetic strategy for the asymmetric total synthesis of ent-ascospiroketals A and B. The synthesis features an efficient ring contraction rearrangement of the 10-membered lactone to the tricyclic spiroketal cis-fused γ-lactone core, which served as the common intermediate for the synthesis of both ent-ascospiroketals A and B through the Stille coupling reaction at the final step. In addition, seven diastereomers were prepared to conclusively confirm the structure of ent-ascospiroketal B.
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Affiliation(s)
- Jian Wang
- Department of Chemistry, The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon, Hong Kong, China
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6
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Yamazaki S, Sugiura H, Niina M, Mikata Y, Ogawa A. Inter- and Intramolecular Diels-Alder Reaction of Ethenetricarboxylate Derivatives. HETEROCYCLES 2016. [DOI: 10.3987/com-15-13394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Toze FAA, Poplevin DS, Zubkov FI, Nikitina EV, Porras C, Khrustalev VN. Crystal structure of methyl (3RS,4SR,4aRS,11aRS,11bSR)-5-oxo-3,4,4a,5,7,8,9,10,11,11a-deca-hydro-3,11b-ep-oxy-azepino[2,1-a]iso-indole-4-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2015; 71:o729-30. [PMID: 26594446 PMCID: PMC4647423 DOI: 10.1107/s2056989015016679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/07/2015] [Indexed: 11/10/2022]
Abstract
The title compound, C15H19NO4, is the a product of the esterification of the corresponding carbonic acid with methanol. The mol-ecule comprises a fused tetra-cyclic system containing three five-membered rings (2-pyrrolidinone, tetra-hydro-furan and di-hydro-furan) and one seven-membered ring (azepane). The five-membered rings have the usual envelope conformations, with the quaternary C atom being the flap atom for the 2-pyrrolidinone ring, and the ether O atom being the common flap atom for the remaining rings. The seven-membered azepane ring adopts a chair conformation with the methine and middle methyl-ene C atoms lying above and below the mean plane defined by the remaining five atoms. The carboxyl-ate substituent is rotated by 77.56 (5)° with respect to the base plane of the tetra-hydro-furan ring. In the crystal, the mol-ecules are bound by weak C-H⋯O hydrogen-bonding inter-actions into puckered layers parallel to (001).
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Affiliation(s)
- Flavien A. A. Toze
- Department of Chemistry, University of Douala, Faculty of Sciences, PO Box 24157, Douala, Republic of Cameroon
| | - Dmitry S. Poplevin
- Department of Organic Chemistry, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Fedor I. Zubkov
- Department of Organic Chemistry, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Eugeniya V. Nikitina
- Department of Organic Chemistry, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Ciara Porras
- Department of Chemistry & Biology, New Mexico Highlands University, 803 University Ave, Las Vegas, NM 87701, USA
| | - Victor N. Khrustalev
- Department of Chemistry & Biology, New Mexico Highlands University, 803 University Ave, Las Vegas, NM 87701, USA
- Department of Inorganic Chemistry, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
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9
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A versatile, RCM based approach to eudesmane and dihydroagarofuran sesquiterpenoids from (−)-carvone: a formal synthesis of (−)-isocelorbicol. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Gulbrandsen HS, Hennum M, Osheka M, Read ML, Gundersen LL. Synthesis of Phenanthridine Derivatives Functionalized in the C-Ring by Means of IMDAF Reactions under Microwave or Conventional Heating Conditions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Zurek JM, Rae RL, Paterson MJ, Bebbington MWP. Unusual structure-energy correlations in intramolecular Diels-Alder reaction transition states. Molecules 2014; 19:15535-45. [PMID: 25268713 PMCID: PMC6272020 DOI: 10.3390/molecules191015535] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 09/01/2014] [Accepted: 09/16/2014] [Indexed: 11/17/2022] Open
Abstract
Detailed analysis of calculated data from an experimental/computational study of intramolecular furan Diels-Alder reactions has led to the unusual discovery that the mean contraction of the newly forming C-C σ-bonds from the transition state to the product shows a linear correlation with both reaction Gibbs free energies and reverse energy barriers. There is evidence for a similar correlation in other intramolecular Diels-Alder reactions involving non-aromatic dienes. No such correlation is found for intermolecular Diels-Alder reactions.
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Affiliation(s)
- Justyna M Zurek
- Institute of Chemical Science, School of Engineering and Physical Sciences, William Perkin building, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Robert L Rae
- Institute of Chemical Science, School of Engineering and Physical Sciences, William Perkin building, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Martin J Paterson
- Institute of Chemical Science, School of Engineering and Physical Sciences, William Perkin building, Heriot-Watt University, Edinburgh EH14 4AS, UK.
| | - Magnus W P Bebbington
- Institute of Chemical Science, School of Engineering and Physical Sciences, William Perkin building, Heriot-Watt University, Edinburgh EH14 4AS, UK.
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Bernasconi M, Müller MA, Pfaltz A. Asymmetric Hydrogenation of Maleic Acid Diesters and Anhydrides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Bernasconi M, Müller MA, Pfaltz A. Asymmetric Hydrogenation of Maleic Acid Diesters and Anhydrides. Angew Chem Int Ed Engl 2014; 53:5385-8. [DOI: 10.1002/anie.201402034] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Indexed: 11/10/2022]
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Rae RL, Żurek JM, Paterson MJ, Bebbington MWP. Halogenation effects in intramolecular furan Diels-Alder reactions: broad scope synthetic and computational studies. Org Biomol Chem 2013; 11:7946-52. [PMID: 24135947 DOI: 10.1039/c3ob41616j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time a comprehensive synthetic and computational study of the effect of halogen substitution on both furan and dienophile for the intramolecular Furan Diels-Alder (IMDAF) reaction has been undertaken. Contrary to our initial expectations, halogen substitution on the dienophile was found to have a significant effect, making the reactions slower and less thermodynamically favourable. However, careful choice of the site of furan halogenation could be used to overcome dienophile halogen substitution, leading to highly functionalised cycloadducts. These reactions are thought to be controlled by the interplay of three factors: positive charge stabilisation in the transition state and product, steric effects and a dipolar interaction term identified by high level calculations. Frontier orbital effects do not appear to make a major contribution in determining the viability of these reactions, which is consistent with our analysis of calculated transition state structural data.
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Affiliation(s)
- Robert L Rae
- Institute of Chemical Science, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
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Abstract
This review covers the isolation, structural determination, synthesis and chemical and microbiological transformations of natural sesquiterpenoids. The literature from January to December 2012 is reviewed, and 471 references are cited.
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Affiliation(s)
- Braulio M Fraga
- Instituto de Productos Naturales y Agrobiología, CSIC, 38206-La Laguna, Tenerife, Canary Islands, Spain
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16
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Zou GF, Pan F, Liao WW. Lewis base catalyzed asymmetric substitution/Diels–Alder cascade reaction: a rapid and efficient construction of enantioenriched diverse tricyclic heterocycles. Org Biomol Chem 2013; 11:7080-3. [DOI: 10.1039/c3ob41454j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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