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Wang ZH, Wu ZJ, Huang XQ, Yue DF, You Y, Xu XY, Zhang XM, Yuan WC. Diastereo- and enantioselective direct vinylogous Michael addition of γ-substituted butenolides to 2-enoylpyridines catalyzed by chiral bifunctional amine-squaramides. Chem Commun (Camb) 2015; 51:15835-8. [DOI: 10.1039/c5cc06383c] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The enantioselective vinylogous Michael addition of γ-substituted butenolides to 2-enoylpyridines was developed to yield γ,γ-disubstituted butenolide derivatives in excellent stereoselectivities.
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Affiliation(s)
- Zhen-Hua Wang
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Zhi-Jun Wu
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Xue-Qun Huang
- School of Life Science and Technology
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Deng-Feng Yue
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Yong You
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Xiao-Ying Xu
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Xiao-Mei Zhang
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Wei-Cheng Yuan
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
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52
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53
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Mak JYW, Pouwer RH, Williams CM. Naturstoffe mit Anti-Bredt- und Brückenkopf-Doppelbindung. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400932] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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54
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Mak JYW, Pouwer RH, Williams CM. Natural products with anti-Bredt and bridgehead double bonds. Angew Chem Int Ed Engl 2014; 53:13664-88. [PMID: 25399486 DOI: 10.1002/anie.201400932] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 04/25/2014] [Indexed: 11/11/2022]
Abstract
Well over a hundred years ago, Professor Julius Bredt embarked on a career pursuing and critiquing bridged bicyclic systems that contained ring strain induced by the presence of a bridgehead olefin. These endeavors founded what we now know as Bredt's rule (Bredtsche Regel). Physical, theoretical, and synthetic organic chemists have intensely studied this premise, pushing the boundaries of such systems to arrive at a better understood physical phenomenon. Mother nature has also seen fit to construct molecules containing bridgehead double bonds that encompass Bredt's rule. For the first time, this topic is reviewed in a natural product context.
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Affiliation(s)
- Jeffrey Y W Mak
- Institute for Molecular Bioscience, The University of Queensland, Brisbane (Australia)
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55
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Lucas MQ, Rodríguez LR, Sanabria DJ, Weil E. Natural Prey Preferences and Spatial Variability of Predation Pressure by Cyphoma gibbosum (Mollusca: Gastropoda) on Octocoral Communities off La Parguera, Puerto Rico. INTERNATIONAL SCHOLARLY RESEARCH NOTICES 2014; 2014:742387. [PMID: 27433523 PMCID: PMC4897310 DOI: 10.1155/2014/742387] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/21/2014] [Indexed: 11/18/2022]
Abstract
This study evaluated the natural prey preferences and spatial variability of predation pressure (PP = proportion of colonies with snails and/or clear predation signs) by the gastropod Cyphoma gibbosum on octocoral communities off the La Parguera Natural Reserve, Puerto Rico. All octocoral colonies were checked for presence of C. gibbosum and/or clear predation signs in four permanent band-transects (2 × 10 m), along three depth intervals (0-5, 7-12, >15 m deep) in each of six reefs along an inshore offshore gradient. Results indicate that C. gibbosum preys on at least 16 species, six of which (Briareum asbestinum, Gorgonia ventalina, Pseudoterogorgia americana, P. acerosa, Plexaura flexuosa, and Pseudoplexaura porosa) consistently showed significantly higher (K-W, P < 0.05) (17-37%) PP compared to all other species. Plexaura flexuosa, P. americana, and P. porosa had significantly higher PP (11-38%) among inner and mid-shelf reefs, and G. ventalina had higher PP in shelf-edge reefs (16-20%). A combination of differential spatial distributions and octocoral species abundances seems to explain the observed patterns of predation by C. gibbosum. Prey preference and higher abundances of 3-dimensional octocorals providing increased refuge or microhabitats utilized for mating or egg-deposition could be driving the spatial distribution of C. gibbosum and the observed differential predation pressure.
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Affiliation(s)
- Matthew Q. Lucas
- Department of Marine Science, University of Puerto Rico, P.O. Box 9000, Mayaguez, PR 00680, USA
| | - Luis R. Rodríguez
- Department of Marine Science, University of Puerto Rico, P.O. Box 9000, Mayaguez, PR 00680, USA
| | - Duane J. Sanabria
- Department of Marine Science, University of Puerto Rico, P.O. Box 9000, Mayaguez, PR 00680, USA
| | - Ernesto Weil
- Department of Marine Science, University of Puerto Rico, P.O. Box 9000, Mayaguez, PR 00680, USA
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56
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Ramsby BD, Shirur KP, Iglesias-Prieto R, Goulet TL. Symbiodinium photosynthesis in Caribbean octocorals. PLoS One 2014; 9:e106419. [PMID: 25192405 PMCID: PMC4156329 DOI: 10.1371/journal.pone.0106419] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/06/2014] [Indexed: 01/17/2023] Open
Abstract
Symbioses with the dinoflagellate Symbiodinium form the foundation of tropical coral reef communities. Symbiodinium photosynthesis fuels the growth of an array of marine invertebrates, including cnidarians such as scleractinian corals and octocorals (e.g., gorgonian and soft corals). Studies examining the symbioses between Caribbean gorgonian corals and Symbiodinium are sparse, even though gorgonian corals blanket the landscape of Caribbean coral reefs. The objective of this study was to compare photosynthetic characteristics of Symbiodinium in four common Caribbean gorgonian species: Pterogorgia anceps, Eunicea tourneforti, Pseudoplexaura porosa, and Pseudoplexaura wagenaari. Symbiodinium associated with these four species exhibited differences in Symbiodinium density, chlorophyll a per cell, light absorption by chlorophyll a, and rates of photosynthetic oxygen production. The two Pseudoplexaura species had higher Symbiodinium densities and chlorophyll a per Symbiodinium cell but lower chlorophyll a specific absorption compared to P. anceps and E. tourneforti. Consequently, P. porosa and P. wagenaari had the highest average photosynthetic rates per cm2 but the lowest average photosynthetic rates per Symbiodinium cell or chlorophyll a. With the exception of Symbiodinium from E. tourneforti, isolated Symbiodinium did not photosynthesize at the same rate as Symbiodinium in hospite. Differences in Symbiodinium photosynthetic performance could not be attributed to Symbiodinium type. All P. anceps (n = 9) and P. wagenaari (n = 6) colonies, in addition to one E. tourneforti and three P. porosa colonies, associated with Symbiodinium type B1. The B1 Symbiodinium from these four gorgonian species did not cluster with lineages of B1 Symbiodinium from scleractinian corals. The remaining eight E. tourneforti colonies harbored Symbiodinium type B1L, while six P. porosa colonies harbored type B1i. Understanding the symbioses between gorgonian corals and Symbiodinium will aid in deciphering why gorgonian corals dominate many Caribbean reefs.
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Affiliation(s)
- Blake D. Ramsby
- Department of Biology, University of Mississippi, University, Mississippi, United States of America
| | - Kartick P. Shirur
- Department of Biology, University of Mississippi, University, Mississippi, United States of America
| | - Roberto Iglesias-Prieto
- Unidad Académica de Sistemas Arrecifales (Puerto Morelos), Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Cancún, México
| | - Tamar L. Goulet
- Department of Biology, University of Mississippi, University, Mississippi, United States of America
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58
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Liaw CC, Cheng YB, Lin YS, Kuo YH, Hwang TL, Shen YC. New briarane diterpenoids from Taiwanese soft coral Briareum violacea. Mar Drugs 2014; 12:4677-92. [PMID: 25153765 PMCID: PMC4145337 DOI: 10.3390/md12084677] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/24/2014] [Accepted: 07/24/2014] [Indexed: 11/18/2022] Open
Abstract
Ten new briarane diterpenoids, briaviolides A-J (1-10), together with six known briaranes, solenolides A and D, excavatolide A, briaexcavatolide I, 4β-acetoxy-9-deacetystylatulide lactone and 9-deacetylstylatulide lactone, were isolated from the Taiwanese soft coral, Briareum violacea. Their structures were determined on the basis of spectroscopic data ((1)H- and (13)C-NMR, (1)H-(1)H COSY, HSQC, HMBC and NOESY), HR-MS and chemical methods. The absolute configuration of briaviolide A (1) was determined by X-ray crystallographic analysis. Compounds 5, 9 and derivative 11 showed moderate inhibitory activities on superoxide-anion generation and elastase release by human neutrophils in response to N-formyl-methionyl-leucyl-phenylalanine/ Cytochalasin B (fMLP/CB).
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Affiliation(s)
- Chia-Ching Liaw
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan.
| | - Yuan-Bin Cheng
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan.
| | - Yun-Sheng Lin
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan.
| | - Yao-Haur Kuo
- Division of Chinese Materia Medica Development, National Research Institute of Chinese Medicine, Taipei 112, Taiwan.
| | - Tsong-Long Hwang
- Graduate Institute of Natural Products, Chang Gung University, Taoyuan 333, Taiwan.
| | - Ya-Ching Shen
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan.
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59
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Diastereodivergent organocatalytic asymmetric vinylogous Michael reactions. Nat Commun 2014; 5:4479. [DOI: 10.1038/ncomms5479] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 06/23/2014] [Indexed: 01/22/2023] Open
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60
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Ponti M, Perlini RA, Ventra V, Grech D, Abbiati M, Cerrano C. Ecological shifts in Mediterranean coralligenous assemblages related to gorgonian forest loss. PLoS One 2014; 9:e102782. [PMID: 25054286 PMCID: PMC4108394 DOI: 10.1371/journal.pone.0102782] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 06/23/2014] [Indexed: 11/19/2022] Open
Abstract
Mediterranean gorgonian forests are threatened by several human activities and are affected by climatic anomalies that have led to mass mortality events in recent decades. The ecological role of these habitats and the possible consequence of their loss are poorly understood. Effects of gorgonians on the recruitment of epibenthic organisms were investigated by manipulating presence of gorgonians on experimental panels at 24 m depth, for Eunicella cavolinii, and at 40 m depth, for Paramuricea clavata, at two sites: Tavolara Island (Tyrrhenian Sea) and Portofino Promontory (Ligurian Sea). After 4 months, the most abundant taxa on the panels were encrusting green algae, erect red algae and crustose coralline algae at 24 m depth and encrusting brown algae and erect red algae at 40 m depth. Assemblages on the panels were significantly affected by the presence of the gorgonians, although effects varied across sites and between gorgonian species. Species diversity and evenness were lower on panels with gorgonian branches. Growth of erect algae and recruitment of serpulid polychaetes were also affected by the presence of the gorgonians, primarily at Tavolara. Crustose coralline algae and erect sponges were more abundant on E. cavolinii panels at 24 m depth, while encrusting bryozoans were more abundant on P. clavata panels at 40 m depth. Effects of gorgonians on recruited assemblages could be due to microscale modification of hydrodynamics and sediment deposition rate, or by a shading effect reducing light intensity. Gorgonians may also intercept settling propagules, compete for food with the filter-feeders and/or for space by producing allelochemicals. Presence of gorgonians mainly limits the growth of erect algae and enhances the abundance of encrusting algae and sessile invertebrates. Therefore, the gorgonian disappearances may cause a shift from assemblages characterised by crustose coralline algae to filamentous algae assemblages, decreasing complexity and resilience of coralligenous bioconstructions.
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Affiliation(s)
- Massimo Ponti
- Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Bologna, UO CoNISMa, Ravenna, Italy
| | - Rossella Angela Perlini
- Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Bologna, UO CoNISMa, Ravenna, Italy
| | - Vincenzo Ventra
- Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Bologna, UO CoNISMa, Ravenna, Italy
| | - Daniele Grech
- Dipartimento di Scienze della Vita e dell’Ambiente, Polytechnic University of Marche, UO CoNISMa, Ancona, Italy
| | - Marco Abbiati
- Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Bologna, UO CoNISMa, Ravenna, Italy
- ISMAR, Consiglio Nazionale delle Ricerche - Istituto di Scienze Marine, Bologna, Italy
| | - Carlo Cerrano
- Dipartimento di Scienze della Vita e dell’Ambiente, Polytechnic University of Marche, UO CoNISMa, Ancona, Italy
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Williams DR, Shah AA. Total Synthesis of (+)-Ileabethoxazole via an Iron-Mediated Pauson–Khand [2 + 2 + 1] Carbocyclization. J Am Chem Soc 2014; 136:8829-36. [DOI: 10.1021/ja5043462] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David R. Williams
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Akshay A. Shah
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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62
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Synthesis of chiral butenolides using amino-thiocarbamate-catalyzed asymmetric bromolactonization. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.01.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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63
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Nawrat CC, Moody CJ. Quinones as Dienophiles in the Diels-Alder Reaction: History and Applications in Total Synthesis. Angew Chem Int Ed Engl 2014; 53:2056-77. [DOI: 10.1002/anie.201305908] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Indexed: 01/24/2023]
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64
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Nawrat CC, Moody CJ. Chinone als Dienophile in der Diels-Alder-Reaktion - historische Entwicklung und Anwendungen in der Totalsynthese. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201305908] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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65
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Lei H, Sun JF, Han Z, Zhou XF, Yang B, Liu Y. Fragilisinins A–L, new briarane-type diterpenoids from gorgonian Junceella fragilis. RSC Adv 2014. [DOI: 10.1039/c3ra46163g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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66
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Ji J, Lin L, Zhou L, Zhang Y, Liu Y, Liu X, Feng X. N,N′-Dioxide-Scandium(III)-Catalyzed Asymmetric Michael Addition of β,γ-Unsaturated Butenolides to α,β-Unsaturated γ-Keto Esters. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300586] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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67
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2013. [DOI: 10.1016/s0040-4020(13)01252-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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68
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Gao C, Yi X, Huang R, Yan F, He B, Chen B. Alkaloids from Corals. Chem Biodivers 2013; 10:1435-47. [DOI: 10.1002/cbdv.201100276] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Indexed: 11/07/2022]
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69
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Fournier J, Lozano O, Menozzi C, Arseniyadis S, Cossy J. Palladium-Catalyzed Asymmetric Allylic Alkylation of Cyclic Dienol Carbonates: Efficient Route to Enantioenriched γ-Butenolides Bearing an All-Carbon α-Quaternary Stereogenic Center. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206368] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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70
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Fournier J, Lozano O, Menozzi C, Arseniyadis S, Cossy J. Palladium-Catalyzed Asymmetric Allylic Alkylation of Cyclic Dienol Carbonates: Efficient Route to Enantioenriched γ-Butenolides Bearing an All-Carbon α-Quaternary Stereogenic Center. Angew Chem Int Ed Engl 2012; 52:1257-61. [DOI: 10.1002/anie.201206368] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Indexed: 11/08/2022]
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71
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Lai D, Liu D, Deng Z, van Ofwegen L, Proksch P, Lin W. Antifouling eunicellin-type diterpenoids from the gorgonian Astrogorgia sp. JOURNAL OF NATURAL PRODUCTS 2012; 75:1595-1602. [PMID: 22905736 DOI: 10.1021/np300404f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Twelve new eunicellin-based diterpenoids, astrogorgins B-M (1-12), were isolated from a Chinese gorgonian Astrogorgia sp., together with ophirin, muricellin, astrogorgin, calicophirins A and B, and 14-deacetoxycalicophirin B. The structures of the new compounds were elucidated by extensive spectroscopic analysis and by comparison with data reported in the literature. Significant antifouling activity was observed for 14-deacetoxycalicophirin B against the larval settlement of the barnacle Balanus amphitrite at nontoxic concentrations with an EC(50) = 0.59 μg/mL, while the other analogues were effective within an EC(50) range of 5.14-17.8 μg/mL.
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Affiliation(s)
- Daowan Lai
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, People's Republic of China
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72
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Zhang W, Tan D, Lee R, Tong G, Chen W, Qi B, Huang KW, Tan CH, Jiang Z. Highly Enantio- and Diastereoselective Reactions of γ-Substituted Butenolides Through Direct Vinylogous Conjugate Additions. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205872] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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73
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Zhang W, Tan D, Lee R, Tong G, Chen W, Qi B, Huang KW, Tan CH, Jiang Z. Highly Enantio- and Diastereoselective Reactions of γ-Substituted Butenolides Through Direct Vinylogous Conjugate Additions. Angew Chem Int Ed Engl 2012; 51:10069-73. [DOI: 10.1002/anie.201205872] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Indexed: 11/11/2022]
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74
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Veeranjaneyulu B, Srilatha M, Reddy GC, Das B. Stereoselective Total Synthesis of Botryolide E. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201100512] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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75
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Efficient AgOTf or Ph3PAuCl–AgSbF6 catalyzed cyclization of 1-hydroxy-2-alkynylallylphosphonates/2-alkynylallyl alcohols to 2-furylphosphonates/2,3,5-trisubstituted furans. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.060] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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76
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Abstract
Two new diterpenes having the rare cubitane skeleton were isolated from a southwestern Caribbean gorgonian coral of the genus Eunicea. The structures of the new metabolites, as well as those of three known cubitanes were elucidated by extensive spectroscopic analysis. One compound showed significant in vitro cytotoxic activity against a National Cancer Institute (NCI) panel of cancer cell lines, whereas the remaining metabolites were shown to exert mild antitubercular and antimalarial activities against the pathogenic microbes Mycobacterium tuberculosis and Plasmodium falciparum.
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77
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Bao J, Ren J, Wang Z. Synthesis of Substituted Furans through Domino Aldol/Homo-Michael Reactions of Formylcyclopropane 1,1-Diesters with 1,3-Dicarbonyls. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200162] [Citation(s) in RCA: 8] [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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78
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Huang LS, He F, Huang H, Zhang XY, Qi SH. Carbamate derivatives and sesquiterpenoids from the South China Sea gorgonian Melitodes squamata. Beilstein J Org Chem 2012; 8:170-6. [PMID: 22423284 PMCID: PMC3302077 DOI: 10.3762/bjoc.8.18] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Accepted: 01/10/2012] [Indexed: 11/26/2022] Open
Abstract
Five carbamate derivatives, obtucarbamates C and D (1, 2), dimethyl ((carbonylbis(azanediyl))bis(2-methyl-5,1-phenylene))dicarbamate (3), obtucarbamates A and B (4, 5), and four aromadendrane-type sesquiterpenoids, (+)-4β-N-methenetauryl-10β-methoxy-1β,5α,6β,7β-aromadendrane (6), (−)-4β-N-methenetauryl-10β-methoxy-1β,5β,6α,7α-aromadendrane (7), (−)-4α,10β-aromadendranediol (8), (+)-4β,10β-aromadendranediol (9) were obtained from the South China Sea gorgonian coral Melitodes squamata Nutting. Compounds 1, 2, 6, and 7 were new, and their structures were established by spectroscopic analyses. Compounds 6 and 7 contained a taurine group that was rarely found in marine natural compounds, and 7 showed moderate antibacterial activity. The possible biosynthesis routes of 1–5 were conjectured.
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Affiliation(s)
- Li-Si Huang
- Key Laboratory of Marine Bio-resources Sustainable Utilization/Guangdong Key Laboratory of Marine Materia Medica/RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, The Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301 Guangdong, China
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79
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Khan MAS, Zhang J, Sarma KD, Ganguly B. Origins of reversing diastereoselectivity of α,β-dichloro-γ-butenolides and γ-butyrolactams in direct vinylogous aldol addition: a computational study. RSC Adv 2012. [DOI: 10.1039/c2ra21203j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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80
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Bioactive Compounds from Marine Gorgonian Corals. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/b978-0-444-59530-0.00012-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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81
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Rocha J, Peixe L, Gomes NC, Calado R. Cnidarians as a source of new marine bioactive compounds--an overview of the last decade and future steps for bioprospecting. Mar Drugs 2011; 9:1860-1886. [PMID: 22073000 PMCID: PMC3210609 DOI: 10.3390/md9101860] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 09/20/2011] [Accepted: 09/21/2011] [Indexed: 12/14/2022] Open
Abstract
Marine invertebrates are rich sources of bioactive compounds and their biotechnological potential attracts scientific and economic interest worldwide. Although sponges are the foremost providers of marine bioactive compounds, cnidarians are also being studied with promising results. This diverse group of marine invertebrates includes over 11,000 species, 7500 of them belonging to the class Anthozoa. We present an overview of some of the most promising marine bioactive compounds from a therapeutic point of view isolated from cnidarians in the first decade of the 21st century. Anthozoan orders Alcyonacea and Gorgonacea exhibit by far the highest number of species yielding promising compounds. Antitumor activity has been the major area of interest in the screening of cnidarian compounds, the most promising ones being terpenoids (monoterpenoids, diterpenoids, sesquiterpenoids). We also discuss the future of bioprospecting for new marine bioactive compounds produced by cnidarians.
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Affiliation(s)
- Joana Rocha
- Instituto de Ciencias Biomedicas Abel Salazar, Universidade do Porto, Largo Professor Abel Salazar no. 2, 4099-003 Porto, Portugal
- Departmento de Biologia & CESAM, Universidade de Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; E-Mail:
| | - Luisa Peixe
- REQUIMTE, Laboratorio de Microbiologia, Faculdade de Farmacia, Universidade do Porto, Rua Anibal Cunha no. 164, 4050-047 Porto, Portugal; E-Mail:
| | - Newton C.M. Gomes
- Departmento de Biologia & CESAM, Universidade de Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; E-Mail:
| | - Ricardo Calado
- Departmento de Biologia & CESAM, Universidade de Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; E-Mail:
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82
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Du GF, He L, Gu CZ, Dai B. Diastereoselective Synthesis of γ-Butenolides Catalyzed by Potassium tert-Butoxide. SYNTHETIC COMMUN 2011. [DOI: 10.1080/00397911.2010.538888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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83
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Elford TG, Nave S, Sonawane RP, Aggarwal VK. Total Synthesis of (+)-Erogorgiaene Using Lithiation–Borylation Methodology, and Stereoselective Synthesis of Each of Its Diastereoisomers. J Am Chem Soc 2011; 133:16798-801. [DOI: 10.1021/ja207869f] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim G. Elford
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Stefan Nave
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Ravindra P. Sonawane
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
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84
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Abstract
The total syntheses of (+)-vigulariol and (-)-sclerophytin A are reported in 15 steps and 16 steps, respectively, from a known compound. The flexible, readily scalable synthetic strategy allows for rapid construction of a critical tricyclic intermediate and is demonstrated via the synthesis of these two marine natural products. A key reaction in this synthetic protocol is a combination Wittig/intramolecular Diels-Alder cycloaddition.
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Affiliation(s)
- Michael T Crimmins
- Kenan Laboratory of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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85
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Li C, La MP, Sun P, Kurtan T, Mandi A, Tang H, Liu BS, Yi YH, Li L, Zhang W. Bioactive (3Z,5E)-11,20-epoxybriara-3,5-dien-7,18-olide diterpenoids from the South China Sea gorgonian Dichotella gemmacea. Mar Drugs 2011; 9:1403-1418. [PMID: 21892354 PMCID: PMC3164382 DOI: 10.3390/md9081403] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 07/28/2011] [Accepted: 08/08/2011] [Indexed: 01/31/2023] Open
Abstract
Six new (3Z,5E)-11,20-epoxybriara-3,5-dien-7,18-olide diterpenoids, gemmacolides N-S (1-6), were isolated together with four known analogues, juncenolide D, and juncins R, S and U (7-10), from the South China Sea gorgonian Dichotella gemmacea. The structures of the new compounds were elucidated by the detailed analysis of spectroscopic data in combination with the comparison with reported data. The absolute configuration of 1 was determined by a TDDFT calculation of its solution ECD spectrum, affording the determination of absolute configuration of other analogues by simply comparing their ECD spectra with that of 1. The cytotoxic and antimicrobial activities of these compounds were evaluated. In preliminary in vitro bioassays, compounds 4, 5, 6, 8 and 9 showed cytotoxicity against A549 and MG63, while compounds 1, 2, 4, 7-10 showed antimicrobial activity against the fungus Septoria tritici and the bacterium Escherichia coli.
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Affiliation(s)
- Cui Li
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Ming-Ping La
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Peng Sun
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Tibor Kurtan
- Department of Organic Chemistry, University of Debrecen, POB 20, 4010 Debrecen, Hungary; E-Mails: (T.K.); (A.M.)
| | - Attila Mandi
- Department of Organic Chemistry, University of Debrecen, POB 20, 4010 Debrecen, Hungary; E-Mails: (T.K.); (A.M.)
| | - Hua Tang
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Bao-Shu Liu
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Yang-Hua Yi
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Ling Li
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
| | - Wen Zhang
- Research Center for Marine Drugs, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, China; E-Mails: (C.L.); (M.-P.L.); (P.S.); (H.T.); (B.-S.L.); (Y.-H.Y.)
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86
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Wei Y, Ma GN, Shi M. Diastereo- and Enantioselective Construction of γ-Butenolides through Chiral Phosphane-Catalyzed Allylic Alkylation of Morita-Baylis-Hillman Acetates. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100704] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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87
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2011. [DOI: 10.1016/s0040-4020(11)00770-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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88
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Hu J, Wei Y, Tong X. Phosphine-Catalyzed [3 + 2] Annulations of γ-Functionalized Butynoates and 1C,3O-Bisnucleophiles: Highly Selective Reagent-Controlled Pathways to Polysubstituted Furans. Org Lett 2011; 13:3068-71. [DOI: 10.1021/ol200940a] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jian Hu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Yabing Wei
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Xiaofeng Tong
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
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89
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Luo X, Zhou Z, Yu F, Li X, Liang X, Ye J. Asymmetric Vinylogous Michael Reaction of α,β-Unsaturated Aldehyde with Buteno-4-lactone. CHEM LETT 2011. [DOI: 10.1246/cl.2011.518] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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90
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Mans DJ, Cox GA, RajanBabu TV. Ethylene in organic synthesis. Repetitive hydrovinylation of alkenes for highly enantioselective syntheses of pseudopterosins. J Am Chem Soc 2011; 133:5776-9. [PMID: 21449569 PMCID: PMC3087302 DOI: 10.1021/ja201321v] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this report we highlight the significant potential of ethylene as a reagent for the introduction of a vinyl group with excellent stereoselectivity at three different stages in the synthesis of a broad class of natural products, best exemplified by syntheses of pseudopterosins. The late-stage applications of the asymmetric hydrovinylation reaction further illustrate the compatibility of the catalyst with complex functional groups. We also show that, depending on the choice of the catalyst, it is possible to either enhance or even completely reverse the inherent diastereoselectivity in the reactions of advanced chiral intermediates. This should enable the synthesis of diastereomeric analogs of several classes of medicinally relevant compounds that are not readily accessible by the existing methods, which depend on 'substrate control' for the installation of many of the chiral centers, especially in molecules of this class.
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Affiliation(s)
- Daniel J. Mans
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, USA
| | - G. Adam Cox
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, USA
| | - T. V. RajanBabu
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, USA
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91
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Luo J, Wang H, Han X, Xu LW, Kwiatkowski J, Huang KW, Lu Y. The Direct Asymmetric Vinylogous Aldol Reaction of Furanones with α-Ketoesters: Access to Chiral γ-Butenolides and Glycerol Derivatives. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006316] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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92
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Luo J, Wang H, Han X, Xu LW, Kwiatkowski J, Huang KW, Lu Y. The Direct Asymmetric Vinylogous Aldol Reaction of Furanones with α-Ketoesters: Access to Chiral γ-Butenolides and Glycerol Derivatives. Angew Chem Int Ed Engl 2011; 50:1861-4. [DOI: 10.1002/anie.201006316] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 12/03/2010] [Indexed: 11/09/2022]
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93
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Zhang Q, Xiao X, Lin L, Liu X, Feng X. Highly enantioselective synthesis of γ-substituted butenolides via the vinylogous Mukaiyama–Michael reaction catalyzed by a chiral scandium(iii)–N,N′-dioxide complex. Org Biomol Chem 2011; 9:5748-54. [DOI: 10.1039/c1ob05558e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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94
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2010. [DOI: 10.1016/s0040-4020(10)01735-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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95
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Whalen KE, Starczak VR, Nelson DR, Goldstone JV, Hahn ME. Cytochrome P450 diversity and induction by gorgonian allelochemicals in the marine gastropod Cyphoma gibbosum. BMC Ecol 2010; 10:24. [PMID: 21122142 PMCID: PMC3022543 DOI: 10.1186/1472-6785-10-24] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Accepted: 12/01/2010] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Intense consumer pressure strongly affects the structural organization and function of marine ecosystems, while also having a profound effect on the phenotype of both predator and prey. Allelochemicals produced by prey often render their tissues unpalatable or toxic to a majority of potential consumers, yet some marine consumers have evolved resistance to host chemical defenses. A key challenge facing marine ecologists seeking to explain the vast differences in consumer tolerance of dietary allelochemicals is understanding the biochemical and molecular mechanisms underlying diet choice. The ability of marine consumers to tolerate toxin-laden prey may involve the cooperative action of biotransformation enzymes, including the inducible cytochrome P450s (CYPs), which have received little attention in marine invertebrates despite the importance of allelochemicals in their evolution. RESULTS Here, we investigated the diversity, transcriptional response, and enzymatic activity of CYPs possibly involved in allelochemical detoxification in the generalist gastropod Cyphoma gibbosum, which feeds exclusively on chemically defended gorgonians. Twelve new genes in CYP family 4 were identified from the digestive gland of C. gibbosum. Laboratory-based feeding studies demonstrated a 2.7- to 5.1-fold induction of Cyphoma CYP4BK and CYP4BL transcripts following dietary exposure to the gorgonian Plexaura homomalla, which contains high concentrations of anti-predatory prostaglandins. Phylogenetic analysis revealed that C. gibbosum CYP4BK and CYP4BL were most closely related to vertebrate CYP4A and CYP4F, which metabolize pathophysiologically important fatty acids, including prostaglandins. Experiments involving heterologous expression of selected allelochemically-responsive C. gibbosum CYP4s indicated a possible role of one or more CYP4BL forms in eicosanoid metabolism. Sequence analysis further demonstrated that Cyphoma CYP4BK/4BL and vertebrate CYP4A/4F forms share identical amino acid residues at key positions within fatty acid substrate recognition sites. CONCLUSIONS These results demonstrate differential regulation of CYP transcripts in a marine consumer feeding on an allelochemical-rich diet, and significantly advance our understanding of both the adaptive molecular mechanisms that marine consumers use to cope with environmental chemical pressures and the evolutionary history of allelochemical-metabolizing enzymes in the CYP superfamily.
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Affiliation(s)
- Kristen E Whalen
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093
| | - Victoria R Starczak
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - David R Nelson
- Department of Molecular Sciences, University of Tennessee, Memphis, TN 38163, USA
| | - Jared V Goldstone
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - Mark E Hahn
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
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96
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Abstract
The total synthesis of the originally proposed structure of briarellin J is reported in 15 steps from a known compound and in 23 steps from readily available materials. Key reactions include an exo-selective intramolecular Diels-Alder and a substrate-controlled hydroboration. Discrepancies in the spectroscopic data of the synthetic and natural material led to a revision of the assigned structure.
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Affiliation(s)
- Michael T Crimmins
- Kenan, Caudill, Venable, and Murray Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
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97
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Rojo de Almeida MT, Siless GE, Perez CD, Veloso MJ, Schejter L, Puricelli L, Palermo JA. Dolabellane Diterpenoids from the South Atlantic Gorgonian Convexella magelhaenica. JOURNAL OF NATURAL PRODUCTS 2010; 73:1714-1717. [PMID: 20853878 DOI: 10.1021/np100337j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Two new dolabellane diterpenoids (1 and 2) were isolated from a small sample of the deep water gorgonian octocoral Convexella magelhaenica collected as a nontarget by-catch by dredging (-93 m) in commercial Patagonian scallop fishing grounds in the South Atlantic. The structures of the new compounds, which are major metabolites in the extract, were established by spectroscopic techniques and chemical transformations. Both compounds were cytotoxic against a human pancreatic adenocarcinoma cell line at micromolar concentrations.
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Affiliation(s)
- María Tereza Rojo de Almeida
- UMYMFOR, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2 (1428), Buenos Aires, Argentina
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98
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Flachsmann F, Schellhaas K, Moya CE, Jacobs RS, Fenical W. Synthetic pseudopterosin analogues: A novel class of antiinflammatory drug candidates. Bioorg Med Chem 2010; 18:8324-33. [PMID: 21041093 DOI: 10.1016/j.bmc.2010.09.067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 09/23/2010] [Accepted: 09/27/2010] [Indexed: 11/15/2022]
Abstract
The synthesis and in vivo anti-inflammatory activity of a series of pseudopterosin analogues are presented. Synthetic tricyclic catechol aglycons with different substitution patterns were monofucosylated or -xylosylated. Anti-inflammatory activity was conserved over a wide range of structural modifications. The most active synthetic compound 33 reduced phorbol myristate acetate (PMA)-induced inflammation in the mouse ear by 72% at 50 μg/ear. This corresponds to 80% of the activity of natural pseudopterosin A.
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Affiliation(s)
- Felix Flachsmann
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, 92093-0204, USA
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99
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Wei X, Rodríguez AD, Baran P, Raptis RG. Dolabellane-type diterpenoids with antiprotozoan activity from a southwestern Caribbean gorgonian octocoral of the genus Eunicea. JOURNAL OF NATURAL PRODUCTS 2010; 73:925-34. [PMID: 20384296 PMCID: PMC2878742 DOI: 10.1021/np100074r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Ten new diterpenes, 1-10, having a dolabellane skeleton were isolated from a Colombian gorgonian coral of the genus Eunicea. Their structures, as well as those of known compounds 11-18, were determined on the basis of spectroscopic analysis and, in some instances, by chemical conversion and X-ray crystallographic analysis. The absolute structure of 7 was established by chemical conversion from 11, a co-occurring dolabellane congener of known absolute structure. Most of these diterpenoids showed antimalarial activity against the protozoan parasite Plasmodium falciparum.
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Affiliation(s)
- Xiaomei Wei
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U. P. R. Station, San Juan, PR 00931-3346
| | - Abimael D. Rodríguez
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U. P. R. Station, San Juan, PR 00931-3346
| | - Peter Baran
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U. P. R. Station, San Juan, PR 00931-3346
| | - Raphael G. Raptis
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U. P. R. Station, San Juan, PR 00931-3346
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100
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Zhu N, Ma BC, Zhang Y, Wang W. Organocatalyzed Highly Enantioselective and anti-Selective Construction of γ-Butenolides through Vinylogous Mukaiyama Aldol Reaction. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000099] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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