1
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Valdez-García RM, Alarcón-Manjarrez C, Galano A, Rodríguez-Molina B, Flores-Álamo M, Iglesias-Arteaga MA. Synthesis of Dimeric Steroid Trioxabispiroacetals Scaffolds by Gold(I)-Catalyzed Hydroalkoxylation-Hydration of Diynediols. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900860] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ricardo M. Valdez-García
- Facultad de Química; Universidad Nacional Autónoma de México, Ciudad Universitaria; 04510 Ciudad de México México
| | - Carlos Alarcón-Manjarrez
- Facultad de Química; Universidad Nacional Autónoma de México, Ciudad Universitaria; 04510 Ciudad de México México
| | - Annia Galano
- Departamento de Química; División de Ciencias Básicas e Ingeniería; Universidad Autónoma Metropolitana-Iztapalapa; Av. San Rafael Atlixco No.186, C.P. 09340, Ciudad de México México
| | - Braulio Rodríguez-Molina
- Instituto de Química; División de Ciencias Básicas e Ingeniería; Universidad Nacional Autónoma de México; 04510 Ciudad de México México
| | - Marcos Flores-Álamo
- Facultad de Química; Universidad Nacional Autónoma de México, Ciudad Universitaria; 04510 Ciudad de México México
| | - Martín A. Iglesias-Arteaga
- Facultad de Química; Universidad Nacional Autónoma de México, Ciudad Universitaria; 04510 Ciudad de México México
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2
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Reddy RR, Panda S, Ghorai P. Enantioselective Synthesis of Cyclohexadienone Containing Spiroketals via DyKat Ketalization/oxa-Michael Addition Cascade. J Org Chem 2019; 84:5357-5368. [PMID: 30884234 DOI: 10.1021/acs.joc.9b00371] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
An oxidative dearomatization of phenol followed by a dynamic kinetic (DyKat) ketalization/oxa-Michael addition cascade using cinchona alkaloid-based chiral bifunctional amino-squaramide catalysts is reported. A broad array of sterically hindered [5,5]-spiroketals attached to a cyclohexadienone moiety in spiro-fashion is synthesized in an enantiopure form. Further, the methodology was optimized and extended to the corresponding benzannulated [5,5]-spiroketals attached to a cyclohexadienone moiety in spiro-fashion. In general, good yields and excellent diastereoselectivies and enantioselectivities (up to 20:1 dr and up to 99% ee) were obtained.
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Affiliation(s)
- Reddy Rajasekhar Reddy
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal By-pass Road , Bhauri , Bhopal 462066 , India
| | - Shibaram Panda
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal By-pass Road , Bhauri , Bhopal 462066 , India
| | - Prasanta Ghorai
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal By-pass Road , Bhauri , Bhopal 462066 , India
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3
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Freeman JL, Brimble MA, Furkert DP. Convenient access to 5-membered cyclic iminium ions: evidence for a stepwise [4 + 2] cycloaddition mechanism. Org Biomol Chem 2019; 17:2705-2714. [PMID: 30768089 DOI: 10.1039/c9ob00262f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ generation and reaction of novel 5-membered N-tosyl cyclic α,β-unsaturated iminium ions from readily prepared stable precursors is demonstrated. Formal iminium Diels-Alder cycloaddition proceeded in good yield via a stepwise rather than concerted cycloaddition process, confirmed through the isolation of a Mukaiyama-Michael type intermediate. Relative stereochemistry was determined upon subsequent intramolecular cyclisation under Lewis acid catalysis to afford formal endo 5,6-spirobicyclic adducts, as confirmed by crystallography. Further synthetic elaboration towards complex molecular scaffolds based on the dinoflagellate metabolite portimine, a potent apoptosis inducer, were also developed.
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Affiliation(s)
- Jared L Freeman
- School of Chemical Sciences, The University of Auckland, Symonds Street, Auckland 1010, New Zealand.
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4
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Guthertz A, Lusseau J, Desvergnes V, Massip S, Landais Y. An Approach towards the Synthesis of the Spiroimine Fragment of 13-Desmethylspirolide C and Gymnodimine A. Chemistry 2019; 25:1553-1560. [DOI: 10.1002/chem.201804972] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Alexandre Guthertz
- Institute of Molecular Sciences (ISM), UMR-CNRS 5255; University of Bordeaux; 351 Cours de la libération 33405 Talence cedex France
| | - Jonathan Lusseau
- Institute of Molecular Sciences (ISM), UMR-CNRS 5255; University of Bordeaux; 351 Cours de la libération 33405 Talence cedex France
| | - Valérie Desvergnes
- Institute of Molecular Sciences (ISM), UMR-CNRS 5255; University of Bordeaux; 351 Cours de la libération 33405 Talence cedex France
| | - Stéphane Massip
- European Institute of Chemistry and Biology (IECB); University of Bordeaux; 2 Rue Robert Escarpit 33600 Pessac France
| | - Yannick Landais
- Institute of Molecular Sciences (ISM), UMR-CNRS 5255; University of Bordeaux; 351 Cours de la libération 33405 Talence cedex France
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5
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Yasukawa Y, Tsuchikawa H, Todokoro Y, Murata M. Stereoselective Construction of Cisoidal Bisspiroacetal Frameworks through Magnesium Coordination of the Bilateral Acetal Oxygen Atoms. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yoshifumi Yasukawa
- Department of Chemistry, Graduate School of Science; Osaka University; 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan
| | - Hiroshi Tsuchikawa
- Department of Chemistry, Graduate School of Science; Osaka University; 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan
| | - Yasuto Todokoro
- Department of Chemistry, Graduate School of Science; Osaka University; 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan
| | - Michio Murata
- Department of Chemistry, Graduate School of Science; Osaka University; 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan
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6
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Chu Z, Wang K, Gao L, Song Z. Chiral crotyl geminal bis(silane): a useful reagent for asymmetric Sakurai allylation by selective desilylation-enabled chirality transfer. Chem Commun (Camb) 2018; 53:3078-3081. [PMID: 28243645 DOI: 10.1039/c7cc00632b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Enantioselective synthesis of SiMe3/SiPh2Me-substituted crotyl geminal bis(silane) has been developed. This compound is a useful reagent for Ph3C+B(C6F5)4--catalyzed asymmetric Sakurai allylation and one-pot Sakurai allylation/Prins cyclization processes. Chemoselective desilylation of SiPh2Me leads to efficient chirality transfer.
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Affiliation(s)
- Zhiwen Chu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
| | - Kai Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China. and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
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7
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Khan MM, Saigal, Khan S, Shareef S, Hussain S. A Facile and Green Approach for One-Pot Synthesis of Functionalized Chromeno[3, 4-b]quinolines and Spiro Chromeno[3, 4-b]quinolines by Using Molecular Iodine as a Catalyst. ChemistrySelect 2018. [DOI: 10.1002/slct.201702810] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- M. Musawwer Khan
- Department of Chemistry; Aligarh Muslim University; Aligarh 202002 India
| | - Saigal
- Department of Chemistry; Aligarh Muslim University; Aligarh 202002 India
| | - Sarfaraz Khan
- Department of Chemistry; Aligarh Muslim University; Aligarh 202002 India
| | | | - Sahid Hussain
- Department of Chemistry; Indian Institute of Technology Patna; Bihar 801106 India
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8
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Hazarika N, Sarmah B, Bordoloi M, Phukan P, Baishya G. Diastereoselective synthesis of tetrahydropyrans via Prins–Ritter and Prins–arylthiolation cyclization reactions. Org Biomol Chem 2017; 15:2003-2012. [DOI: 10.1039/c6ob02692c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly diastereoselective Prins–Ritter and Prins-arylthiolation cyclization reactions have been developed for the synthesis of two novel classes of tetrahydropyran derivatives.
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Affiliation(s)
- Nabajyoti Hazarika
- Chemical Science & Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat-785006
- India
- Department of Chemistry
| | - Barnali Sarmah
- Chemical Science & Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat-785006
- India
- Department of Chemistry
| | - Manobjyoti Bordoloi
- Chemical Science & Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat-785006
- India
| | - Prodeep Phukan
- Department of Chemistry
- Gauhati University
- Guwahati-14
- India
| | - Gakul Baishya
- Chemical Science & Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat-785006
- India
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9
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Stivala CE, Benoit E, Aráoz R, Servent D, Novikov A, Molgó J, Zakarian A. Synthesis and biology of cyclic imine toxins, an emerging class of potent, globally distributed marine toxins. Nat Prod Rep 2015; 32:411-35. [PMID: 25338021 DOI: 10.1039/c4np00089g] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
From a small group of exotic compounds isolated only two decades ago, Cyclic Imine (CI) toxins have become a major class of marine toxins with global distribution. Their distinct chemical structure, biological mechanism of action, and intricate chemistry ensures that CI toxins will continue to be the subject of fascinating fundamental studies in the broad fields of chemistry, chemical biology, and toxicology. The worldwide occurrence of potent CI toxins in marine environments, their accumulation in shellfish, and chemical stability are important considerations in assessing risk factors for human health. This review article aims to provide an account of chemistry, biology, and toxicology of CI toxins from their discovery to the present day.
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Affiliation(s)
- Craig E Stivala
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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10
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Diversity-oriented approach to intricate bis-armed spirocycles involving a two directional [2+2+2] co-trimerization and the [4+2] cycloaddition reaction as key steps. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Sarmah B, Baishya G, Baruah RK. Prins-Arylthiolation Reaction on Terpenoids: Diastereoselective Synthesis of 4-Arylthiooctahydro-2H-chromenes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Wu YB, Tang Y, Luo GY, Chen Y, Hsung RP. An Approach toward Constructing the Trioxadispiroketal Core in the DEF-Ring of (+)-Spirastrellolide A. Org Lett 2014; 16:4550-3. [DOI: 10.1021/ol502103b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Yi-Biao Wu
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Yu Tang
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Guo-Ying Luo
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Yang Chen
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705 United States
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13
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Labarre-Lainé J, Periñan I, Desvergnes V, Landais Y. Synthesis of the C10-C24-bis-spiroacetal core of 13-desmethyl spirolide C based on a sila-Stetter-acetalization process. Chemistry 2014; 20:9336-41. [PMID: 24925107 DOI: 10.1002/chem.201402894] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Indexed: 11/11/2022]
Abstract
Synthesis of the bis-spiroacetal core of 13-desmethyl spirolide C has been completed based on a sila-Stetter-acetalization process. The acylsilane and enone partners in the Stetter reaction were prepared in 7 and 11 steps, respectively, from (S) and (R)-aspartic acid. The quaternary center at C19 in the enone moiety was controlled by relying on the Seebach's chiral self-reproduction method using an enantiopure (S)-lactic acid based dioxolanone. The final acid-catalyzed spiroacetalization provided the desired spiroacetal as a mixture of diastereoisomers in 13 linear steps. Whatever the conditions used, the non-natural transoid isomer was formed preferentially. However, both cisoid and transoid isomers were isolated pure and their structure assigned unambiguously through NMR spectroscopic studies.
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Affiliation(s)
- Jessica Labarre-Lainé
- University of Bordeaux, 351, Cours de la libération, 33405 Talence Cedex (France), Fax: (+33) 5-40-00-62-86
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14
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15
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Oger C, Balas L, Durand T, Galano JM. Are alkyne reductions chemo-, regio-, and stereoselective enough to provide pure (Z)-olefins in polyfunctionalized bioactive molecules? Chem Rev 2012. [PMID: 23194255 DOI: 10.1021/cr3001753] [Citation(s) in RCA: 251] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Camille Oger
- Institut des Biomolécules Max Mousseron, UMR CNRS 5247, Université Montpellier 1, Faculté de Pharmacie, 15 av. Charles Flahault, Bât. D, 34093 Montpellier Cedex 05, France
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16
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Parvatkar PT, Parameswaran PS, Tilve SG. Recent Developments in the Synthesis of Five- and Six-Membered Heterocycles Using Molecular Iodine. Chemistry 2012; 18:5460-89. [DOI: 10.1002/chem.201100324] [Citation(s) in RCA: 248] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Stivala CE, Gu Z, Smith LL, Zakarian A. Studies toward the synthesis of spirolide C: exploration into the formation of the 23-membered all-carbon macrocyclic framework. Org Lett 2012; 14:804-7. [PMID: 22260643 DOI: 10.1021/ol203342e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of two complex subunits en route to spirolide C is described. A key alkyllithium addition to an aldehyde joins the fragments, which are advanced in order to investigate a ring-closing metathesis to form the 23-membered all-carbon macrocyclic framework.
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Affiliation(s)
- Craig E Stivala
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA
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18
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Otero A, Chapela MJ, Atanassova M, Vieites JM, Cabado AG. Cyclic Imines: Chemistry and Mechanism of Action: A Review. Chem Res Toxicol 2011; 24:1817-29. [DOI: 10.1021/tx200182m] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Kong K, Moussa Z, Lee C, Romo D. Total synthesis of the spirocyclic imine marine toxin (-)-gymnodimine and an unnatural C4-epimer. J Am Chem Soc 2011; 133:19844-56. [PMID: 22023219 DOI: 10.1021/ja207385y] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total synthesis of the marine toxin (-)-gymnodimine (1) has been accomplished in a convergent manner. A highly diastereo- and enantioselective exo-Diels-Alder reaction catalyzed by a bis-oxazoline Cu(II) catalyst enabled rapid assembly of the spirocyclic core of gymnodimine. The preparation of the tetrahydrofuran fragment utilized a chiral auxiliary based anti-aldol reaction. Two major fragments, spirolactam 56 and tetrahydrofuran 55, were then coupled through an efficient Nozaki-Hiyama-Kishi reaction. An unconventional, ambient temperature t-BuLi-initiated intramolecular Barbier reaction of alkyl iodide 64 was employed to form the macrocycle. A late stage vinylogous Mukaiyama aldol addition of a silyloxyfuran to a complex cyclohexanone 83 appended the butenolide, and a few additional steps provided (-)-gymnodimine (1). A diastereomer of the natural product was also synthesized, C4-epi-gymnodimine (90), derived from the vinylogous Mukaiyama aldol addition.
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Affiliation(s)
- Ke Kong
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA
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20
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Saikia AK, Bondalapati S, Indukuri K, Gogoi P. Axial-selectivity in Prins Cyclization Reaction: Synthesis of 4-Iodotetrahydropyrans. CHEM LETT 2011. [DOI: 10.1246/cl.2011.1176] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Ullapu PR, Kim YS, Lee JK, Pae AN, Kim Y, Min SJ, Cho YS. Synthesis of 3,4-dimethylidene oxacycles through Prins-type cyclization of allenylmethylsilanes. Chem Asian J 2011; 6:2092-100. [PMID: 21661116 DOI: 10.1002/asia.201100162] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Indexed: 11/07/2022]
Abstract
An efficient synthesis of 3,4-dimethylidene oxacycles including oxolanes and oxepanes through Prins-type cyclization of hydroxy(allenylmethyl)silanes is described. We have shown that 2-substituted tetrahydrofuran derivatives could be produced by using this strategy although the 5-endo-trig cyclization mode is stereoelectronically disfavored. We also applied our method to the stereoselective synthesis of 2,7-cis-3,4-dimethylidene oxepanes, which were used for constructing more complex ring systems, such as polyether bicycles or tricycles.
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Affiliation(s)
- Punna Reddy Ullapu
- Center for Neuro-Medicine, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil, Seongbuk-gu, Seoul, 136-791, South Korea
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22
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Volchkov I, Sharma K, Cho EJ, Lee D. Efficient One-Step Synthesis of Bis-Spiroketals from Diynediols by π-Lewis Acid-Catalyzed Hydroalkoxylation/Hydration. Chem Asian J 2011; 6:1961-6. [DOI: 10.1002/asia.201100131] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Indexed: 11/08/2022]
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23
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Yadav J, Subba Reddy B, Singh AP, Chaya DN, Chatterjee D, Kunwar A. First example of carbohydrate-based Prins cyclization: a novel class of sugar-annulated tetrahydropyrans. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.01.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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25
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Synthesis of tetrahydropyrans and related heterocycles via prins cyclization; extension to aza-prins cyclization. Tetrahedron 2010. [DOI: 10.1016/j.tet.2009.10.069] [Citation(s) in RCA: 302] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Sperry J, Liu YC(W, Brimble MA. Synthesis of natural products containing spiroketals via intramolecular hydrogen abstraction. Org Biomol Chem 2010; 8:29-38. [DOI: 10.1039/b916041h] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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28
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Stivala CE, Zakarian A. Studies toward the synthesis of spirolides: assembly of the elaborated E-ring fragment. Org Lett 2009; 11:839-42. [PMID: 19199776 DOI: 10.1021/ol8027797] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereoselective synthesis of the spiroimine fragment of spirolide C is described. The congested C7 and C29 tertiary and quaternary centers are constructed by a diastereoselective Ireland-Claisen rearrangement. The E ring is completed by means of an aldol cyclocondensation. Additional studies were preformed on the advanced intermediate to probe a future coupling strategy.
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Affiliation(s)
- Craig E Stivala
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, USA
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29
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Choi KW, Brimble MA. Synthesis of spiroacetal-nucleosides as privileged natural product-like scaffolds. Org Biomol Chem 2009; 7:1424-36. [DOI: 10.1039/b818314g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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31
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Miranda P, Ramírez M, Martín V, Padrón J. Factors Controlling the Alkyne Prins Cyclization: The Stability of Dihydropyranyl Cations. Chemistry 2008; 14:6260-8. [DOI: 10.1002/chem.200800281] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Choi KW, Brimble MA. Synthesis of spiroacetal-triazoles as privileged natural product-like scaffolds using “click chemistry”. Org Biomol Chem 2008; 6:3518-26. [DOI: 10.1039/b808454h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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33
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O'Connor PD, Brimble MA. Synthesis of macrocyclic shellfish toxins containing spiroimine moieties. Nat Prod Rep 2007; 24:869-85. [PMID: 17653363 DOI: 10.1039/b700307m] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An overview of the structure and biological activity of macrocyclic polyketides derived from dinoflagellates that contain unusual cyclic imine units is provided. The total and partial syntheses of these molecules are discussed with an emphasis on the construction of the spiroimine functionality thought to be the key pharmacophore of these fact-acting shellfish toxins.
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Affiliation(s)
- Patrick D O'Connor
- Department of Chemistry, The University of Auckland, 23 Symonds Street, Auckland, New Zealand
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Brimble MA, Halim R. Synthetic studies toward shellfish toxins containing spiroacetal units. PURE APPL CHEM 2007. [DOI: 10.1351/pac200779020153] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The synthesis of the ABC spiroacetal-containing fragment of the marine biotoxins, the pectenotoxins (PTXs), is described. The synthetic strategy involves appendage of the highly substituted tetrahydofuran C ring to the AB spiroacetal unit via stereocontrolled cyclization of a γ-hydroxyepoxide. The bis-spiroacetal moiety of the spirolide family of shellfish toxins is also described, making use of an iterative radical oxidative cyclization strategy.
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Affiliation(s)
- Margaret A. Brimble
- 1Department of Chemistry, University of Auckland, 23 Symonds Street, Auckland, New Zealand
| | - Rosliana Halim
- 1Department of Chemistry, University of Auckland, 23 Symonds Street, Auckland, New Zealand
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Majumdar KC, Basu PK, Chattopadhyay SK. Formation of five- and six-membered heterocyclic rings under radical cyclisation conditions. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.09.049] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Miranda PO, Padrón JM, Padrón JI, Villar J, Martín VS. Prins-Type Synthesis and SAR Study of Cytotoxic Alkyl Chloro Dihydropyrans. ChemMedChem 2006; 1:323-9. [PMID: 16892367 DOI: 10.1002/cmdc.200500057] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A series of functionalized tetrahydropyran and dihydropyran derivatives was synthesized by means of a Prins-type cyclization between unsaturated alcohols and several aldehydes. An unprecedented dimer bearing two 4-chloro-5,6-dihydro-2H-pyran scaffolds was obtained in high yield. A panel of three representative human solid tumor cells from diverse origin was used to assess the cytotoxicity of the compounds. Overall, the results show the relevance of the chlorovinyl group in the biological activity, and 2-alkyl-4-chloro-5,6-dihydro-2H-pyrans represent interesting leads for further chemical modifications and biological studies.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González (IUBO-AG), Universidad de la Laguna, C/Astrofísico Francisco Sánchez, 2, 38206 La Laguna, and Instituto Canario de Investigación Biomédica, Hospital Universitario NS de Candelaria, Tenerife, Spain
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Meilert K, Brimble MA. Synthesis of the bis-spiroacetal moiety of the shellfish toxins spirolides B and D using an iterative oxidative radical cyclization strategy. Org Biomol Chem 2006; 4:2184-92. [PMID: 16729128 DOI: 10.1039/b604334h] [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: 11/21/2022]
Abstract
The enantioselective synthesis of the bis-spiroacetal fragment of the shellfish toxins, spirolides B 1 and D 2, is reported. The carbon framework was constructed via a Barbier reaction of dihydropyran 10 with aldehyde 11, followed by two oxidative radical cyclizations to construct the bis-spiroacetal ring system. A silyl-modified Prins cyclization and enantioselective crotylation successfully installed the stereocenters in the cyclization precursor 21. The initial unsaturated bis-spiroacetals 9a-d underwent equilibration during epoxidation to trans-epoxide 24 that was converted to tertiary alcohol 7.
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Affiliation(s)
- Kai Meilert
- Department of Chemistry, University of Auckland, 23 Symonds St., Auckland, New Zealand
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