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Roy S, Acosta JAM, Karak M, Ramirez-Velez I, Torikai K, Ren D, Barbosa LCA. Effects of Synthetic Tetronamides and Methylated Denigrins on Bacterial Quorum Sensing and Biofilm Formation. ACS OMEGA 2023; 8:37798-37807. [PMID: 37867724 PMCID: PMC10586261 DOI: 10.1021/acsomega.3c01729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 09/15/2023] [Indexed: 10/24/2023]
Abstract
Detrimental biofilms of bacterial pathogens cause chronic infections with a high-level tolerance to antibiotics. To identify new control agents, we synthesized and tested a total of 14 tetronamides (including 5 new compounds) and 6 denigrin intermediates on the model species Escherichia coli. At a concentration of 50 μg/mL, two tetronamides and two methylated denigrins exhibited significant inhibitory effects against biofilm formation of E. coli RP437, e.g., by 60 and 94%, respectively. Structural analysis of the tested compounds revealed that p-methoxybenzylidene and p-methoxyphenethyl moieties of denigrins are important for biofilm inhibition, while the former group is also essential to the activity against quorum sensing (QS) via AI-2. Specifically, tetramethyldenigrin B has strong inhibitory effects against both E. coli biofilm formation and AI-2-mediated QS and thus provides a promising lead structure for designing better control agents. Consistently, tetramethyldenigrin B also showed inhibitory activity against biofilm formation of uropathogenic E. coli. Together, these findings provide new insights for the rational design of novel biofilm and QS inhibitors.
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Affiliation(s)
- Sweta Roy
- Department
of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Jaime A. M. Acosta
- Department
of Chemistry, Universidade Federal de Minas
Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, Belo Horizonte, MG CEP 31270-901, Brazil
- Chemical
Technology School, Universidad Tecnológica
de Pereira, Carrera 27
#10-02, Barrio Álamos, Risaralda, Pereira Código postal 660003, Colombia
| | - Milandip Karak
- Department
of Chemistry, Universidade Federal de Minas
Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, Belo Horizonte, MG CEP 31270-901, Brazil
- Department
of Chemistry, Faculty of Science, Kyushu
University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Isabela Ramirez-Velez
- Department
of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Kohei Torikai
- Department
of Chemistry, Faculty of Science, Kyushu
University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Faculty
of Chemistry, National University of Uzbekistan
named after Mirzo Ulugbek, 4 University Str., Tashkent 100174, Uzbekistan
| | - Dacheng Ren
- Department
of Biomedical and Chemical Engineering and Civil and Environmental
Engineering and Biology, Syracuse University, Syracuse, New York 13244, United States
| | - Luiz C. A. Barbosa
- Department
of Chemistry, Universidade Federal de Minas
Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, Belo Horizonte, MG CEP 31270-901, Brazil
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2
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Silva JG, de Miranda AS, Ismail FMD, Barbosa LCA. Synthesis and medicinal chemistry of tetronamides: Promising agrochemicals and antitumoral compounds. Bioorg Med Chem 2022; 67:116815. [PMID: 35598527 DOI: 10.1016/j.bmc.2022.116815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 11/30/2022]
Abstract
Butenolides and tetronic acids occupy a prominent position in synthetic chemistry due to their ubiquitous distribution in nature. This has stimulated investigations firstly in the synthesis of such systems and, laterly, the interest has turned to the understanding of the quantum structure of such systems, allowing a deeper understanding of the mechanism and reactivity of this cyclic scaffold. In contrast, tetronamides, which consist of compounds bearing a 4-aminofuran-2(5H)-one backbone, are relatively rare in nature and synthetic routes to such compounds are poorly explored. This review highlights both the importance of the tetronamide scaffold in medicinal chemistry and the most relevant recondite synthetic strategies for obtaining compounds of this class.
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Affiliation(s)
- Júnio G Silva
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Amanda S de Miranda
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Fyaz M D Ismail
- Centre for Natural Product Discovery (CNPD), School of Pharmacy & Biomolecular Sciences, Byrom Street, Liverpool John Moores University, Liverpool L3 3AF, UK
| | - Luiz C A Barbosa
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil.
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3
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Moreira TA, Antolínez IV, Valença WO, Roy S, Ramirez I, Barbosa LCA, Ren D. Cadiolide analogues and their precursors as new inhibitors of bacterial quorum sensing and biofilm formation. Bioorg Med Chem Lett 2021; 57:128498. [PMID: 34896477 DOI: 10.1016/j.bmcl.2021.128498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 12/02/2021] [Accepted: 12/05/2021] [Indexed: 11/16/2022]
Abstract
Bacterial quorum sensing (QS) and biofilm formation are promising targets for developing new therapies to treat chronic infections. Herein, we report the stereoselective synthesis of 18 new analogs of natural cadiolides. Among the new compounds, substances 8b, 8f, 8i, 9a, 9b and 9e completely inhibited the biofilm formation of Escherichia coli RP347 in vitro. In addition, compound 8b interfered acyl-homoserine lactone (AHL) mediated QS, while 9e interrupted the QS via autoinducer-2 (AI-2). Biological assays also revealed that synthetic intermediates alkynones are potent inhibitors of AI-2 and AHL-mediated QS. These results indicate that cadiolides and alkynones are good candidates for further structural modification for a new generation of more potent antimicrobial agents.
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Affiliation(s)
- Thais A Moreira
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Isabel V Antolínez
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Wagner O Valença
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Sweta Roy
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA
| | - Isabela Ramirez
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY 13244, USA
| | - Luiz C A Barbosa
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil.
| | - Dacheng Ren
- Department of Biomedical and Chemical Engineering, Civil and Environmental Engineering, and Biology, Syracuse University, Syracuse, NY 13244, USA.
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Wei MX, Yu JY, Liu XX, Li XQ, Yang JH, Zhang MW, Yang PW, Zhang SS, He Y. Synthesis and biological evaluation of novel artemisone-piperazine-tetronamide hybrids. RSC Adv 2021; 11:18333-18341. [PMID: 35480921 PMCID: PMC9033422 DOI: 10.1039/d1ra00750e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/13/2021] [Indexed: 11/21/2022] Open
Abstract
For the first time, six novel artemisone-piperazine-tetronamide hybrids (12a-f) were efficiently synthesised from dihydroartemisinin (DHA) and investigated for their in vitro cytotoxicity against some human cancer cells and benign cells. All the targets showed good cytotoxic activity in vitro. Hybrid 12a exhibited much better inhibitory activity against human liver cancer cell line SMMC-7721 (IC50 = 0.03 ± 0.04 μM for 24 h) than the parent DHA (IC50 > 0.7 μM), and two references, vincristine (VCR; IC50 = 0.27 ± 0.03 μM) & cytosine arabinoside (ARA; IC50 = 0.63 ± 0.04 μM). Furthermore, hybrid 12a had low toxicity against human benign liver cell line LO2 (IC50 = 0.70 ± 0.02 μM for 24 h) compared with VCR, ARA, and DHA in vitro. Moreover, the inhibitory activity of hybrid 12a was obviously enhanced when human liver cancer cell line MHCC97H absorbed Fe2+ in vitro.
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Affiliation(s)
- Meng-Xue Wei
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Jia-Ying Yu
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Xin-Xin Liu
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Xue-Qiang Li
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Jin-Hui Yang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Meng-Wei Zhang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Pei-Wen Yang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Si-Si Zhang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
| | - Yu He
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Engineering Research Center for Natural Medicine, National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Chemical Engineering, Ningxia University 489 Helanshan West Road Yinchuan 750021 China
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Curti C, Battistini L, Sartori A, Zanardi F. New Developments of the Principle of Vinylogy as Applied to π-Extended Enolate-Type Donor Systems. Chem Rev 2020; 120:2448-2612. [PMID: 32040305 PMCID: PMC7993750 DOI: 10.1021/acs.chemrev.9b00481] [Citation(s) in RCA: 102] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Indexed: 12/19/2022]
Abstract
The principle of vinylogy states that the electronic effects of a functional group in a molecule are possibly transmitted to a distal position through interposed conjugated multiple bonds. As an emblematic case, the nucleophilic character of a π-extended enolate-type chain system may be relayed from the legitimate α-site to the vinylogous γ, ε, ..., ω remote carbon sites along the chain, provided that suitable HOMO-raising strategies are adopted to transform the unsaturated pronucleophilic precursors into the reactive polyenolate species. On the other hand, when "unnatural" carbonyl ipso-sites are activated as nucleophiles (umpolung), vinylogation extends the nucleophilic character to "unnatural" β, δ, ... remote sites. Merging the principle of vinylogy with activation modalities and concepts such as iminium ion/enamine organocatalysis, NHC-organocatalysis, cooperative organo/metal catalysis, bifunctional organocatalysis, dicyanoalkylidene activation, and organocascade reactions represents an impressive step forward for all vinylogous transformations. This review article celebrates this evolutionary progress, by collecting, comparing, and critically describing the achievements made over the nine year period 2010-2018, in the generation of vinylogous enolate-type donor substrates and their use in chemical synthesis.
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Affiliation(s)
| | | | | | - Franca Zanardi
- Dipartimento di Scienze degli
Alimenti e del Farmaco, Università
di Parma, Parco Area delle Scienze 27A, 43124 Parma, Italy
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6
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Acosta JA, Karak M, Barbosa LC, Boukouvalas J, Straforini A, Forlani G. Synthesis of new tetronamides displaying inhibitory activity against bloom-forming cyanobacteria. PEST MANAGEMENT SCIENCE 2020; 76:779-788. [PMID: 31397956 DOI: 10.1002/ps.5580] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/16/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND The increasing frequency and intensity of cyanobacterial blooms pose a serious threat to aquatic ecosystems. These blooms produce potent toxins that can contaminate drinking water and endanger the life of wild and domestic animals as well as humans. Consequently, the development of effective methods for their control is a matter of high priority. We have previously shown that some γ-benzylidenebutenolides, related to the rubrolide family of natural products, are capable of inhibiting the photosynthetic electron transport chain (Hill reaction), a target of commercial herbicides. Here we report the synthesis and biological properties of a new class of rubrolide-inspired molecules featuring a tetronamide motif. RESULTS A total of 47 N-aryl tetronamides, including 38 aldol adducts, were prepared bearing phenyl, biphenyl, naphthyl, aliphatic and heteroaromatic groups. Some of the aldol adducts were dehydrated to the corresponding γ-benzylidenetetronamides, although satisfactory yields were obtained in only three cases (52-97%). None of the synthesized compounds were capable of blocking the Hill reaction. This notwithstanding, several aldol adducts equipped with a biphenyl substituent displayed excellent inhibitory activity against Synechococcus elongatus and other cyanobacterial strains (IC50 = 1-5 μM). Further, these tetronamides were found to be essentially inactive against eukaryotic microorganisms. CONCLUSION Several newly synthesized biphenyl-containing tetronamides were shown to display potent and selective inhibitory activity against cyanobacteria. These compounds appear to exert their biological effects without interfering with the Hill reaction. As such, they represent novel leads in the search of environmentally benign agents for controlling cyanobacterial blooms. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Jaime Am Acosta
- Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Milandip Karak
- Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - Luiz Ca Barbosa
- Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
- Department of Chemistry, Federal University of Viçosa, Viçosa, Brazil
| | - John Boukouvalas
- Department of Chemistry, Pavillon Alexandre-Vachon, Université Laval, Quebec, Canada
| | - Andrea Straforini
- Department of Life Science and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Giuseppe Forlani
- Department of Life Science and Biotechnology, University of Ferrara, Ferrara, Italy
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Sarotti AM. Structural revision of two unusual rhamnofolane diterpenes, curcusones I and J, by means of DFT calculations of NMR shifts and coupling constants. Org Biomol Chem 2018; 16:944-950. [DOI: 10.1039/c7ob02916k] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The structures of two unusual rhamnofolane diterpenes, curcusones I and J, have been revised using quantum calculations of NMR shifts.
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Affiliation(s)
- Ariel M. Sarotti
- Instituto de Química Rosario (CONICET)
- Facultad de Ciencias Bioquímicas y Farmacéuticas
- Universidad Nacional de Rosario
- Rosario 2000
- Argentina
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8
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Li CS, Sarotti AM, Huang P, Dang UT, Hurdle JG, Kondratyuk TP, Pezzuto JM, Turkson J, Cao S. NF-κB inhibitors, unique γ-pyranol-γ-lactams with sulfide and sulfoxide moieties from Hawaiian plant Lycopodiella cernua derived fungus Paraphaeosphaeria neglecta FT462. Sci Rep 2017; 7:10424. [PMID: 28874704 PMCID: PMC5585240 DOI: 10.1038/s41598-017-10537-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 08/09/2017] [Indexed: 01/25/2023] Open
Abstract
LC-UV/MS-based metabolomic analysis of the Hawaiian endophytic fungus Paraphaeosphaeria neglecta FT462 led to the identification of four unique mercaptolactated γ-pyranol-γ-lactams, paraphaeosphaerides E-H (1-4) together with one γ-lactone (5) and the methyl ester of compound 2 (11). The structures of the new compounds (1-5 and 11) were elucidated through the analysis of HRMS and NMR spectroscopic data. The absolute configuration was determined by chemical reactions with sodium borohydride, hydrogen peroxide, α-methoxy-α-(trifluoromethyl)phenylacetyl chlorides (Mosher reagents), and DP4 + NMR calculations. All the compounds were tested against STAT3, A2780 and A2780cisR cancer cell lines, E. coli JW2496, and NF-κB. Compounds 1 and 3 strongly inhibited NF-κB with IC50 values of 7.1 and 1.5 μM, respectively.
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Affiliation(s)
- Chun-Shun Li
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200W. Kawili Street, Hilo, HI, 96720, USA
- Cancer Biology Program, Cancer Center, University of Hawaii, 701 Ilalo Street, Honolulu, Hawai'i, 96813, USA
| | - Ariel M Sarotti
- Instituto de Química Rosario (CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, Rosario, 2000, Argentina
| | - Peng Huang
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200W. Kawili Street, Hilo, HI, 96720, USA
- College of Pharmacy, Anhui University of Chinese Medicine, 45 Shihe Road, Hefei, 230031, China
| | - Uyen T Dang
- Center for Infectious and Inflammatory Diseases, Texas A&M Health Science Center, 2121 West Holcombe Blvd., Houston, TX, 77030, USA
| | - Julian G Hurdle
- Center for Infectious and Inflammatory Diseases, Texas A&M Health Science Center, 2121 West Holcombe Blvd., Houston, TX, 77030, USA
| | - Tamara P Kondratyuk
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200W. Kawili Street, Hilo, HI, 96720, USA
| | - John M Pezzuto
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200W. Kawili Street, Hilo, HI, 96720, USA
- Arnold & Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, 75 DeKalb Avenue, Brooklyn, NY, 11201-5497, USA
| | - James Turkson
- Cancer Biology Program, Cancer Center, University of Hawaii, 701 Ilalo Street, Honolulu, Hawai'i, 96813, USA
| | - Shugeng Cao
- Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawai'i at Hilo, 200W. Kawili Street, Hilo, HI, 96720, USA.
- Cancer Biology Program, Cancer Center, University of Hawaii, 701 Ilalo Street, Honolulu, Hawai'i, 96813, USA.
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Huang P, Li C, Sarotti AM, Turkson J, Cao S. Sphaerialactonam, a γ-lactam–isochromanone from the Hawaiian endophytic fungus Paraphaeosphaeria sp. FT462. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.02.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Acosta JAM, Muddala R, Barbosa LCA, Boukouvalas J. Total Synthesis of the Antitumor Antibiotic Basidalin. J Org Chem 2016; 81:6883-6. [DOI: 10.1021/acs.joc.6b01255] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jaime A. M. Acosta
- Department
of Chemistry, Pavillon Alexandre-Vachon, Université Laval, 1045 Avenue de la Médecine, Quebec
City, Quebec G1V 0A6, Canada
| | - Ramesh Muddala
- Department
of Chemistry, Pavillon Alexandre-Vachon, Université Laval, 1045 Avenue de la Médecine, Quebec
City, Quebec G1V 0A6, Canada
| | - Luiz C. A. Barbosa
- Department
of Chemistry, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais (UFMG), Av. Pres. Antônio Carlos, 6627, Campus Pampulha, Belo Horizonte, 31270-901, MG, Brazil
| | - John Boukouvalas
- Department
of Chemistry, Pavillon Alexandre-Vachon, Université Laval, 1045 Avenue de la Médecine, Quebec
City, Quebec G1V 0A6, Canada
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11
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Karak M, Acosta JAM, Barbosa LCA, Boukouvalas J. Late-Stage Bromination Enables the Synthesis of Rubrolides B, I, K, and O. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600473] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Milandip Karak
- Department of Chemistry; Universidade Federal de Minas Gerais; Av. Pres. Antônio Carlos, 6627, Campus Pampulha CEP 31270-901 Belo Horizonte MG Brazil
- Department of Chemistry; Universidade Federal de Viçosa; Av. Peter Henry Rolfs, s/n Campus Universitário CEP 36570-900 Viçosa MG Brazil
| | - Jaime A. M. Acosta
- Department of Chemistry; Universidade Federal de Minas Gerais; Av. Pres. Antônio Carlos, 6627, Campus Pampulha CEP 31270-901 Belo Horizonte MG Brazil
| | - Luiz C. A. Barbosa
- Department of Chemistry; Universidade Federal de Minas Gerais; Av. Pres. Antônio Carlos, 6627, Campus Pampulha CEP 31270-901 Belo Horizonte MG Brazil
- Department of Chemistry; Universidade Federal de Viçosa; Av. Peter Henry Rolfs, s/n Campus Universitário CEP 36570-900 Viçosa MG Brazil
| | - John Boukouvalas
- Department of Chemistry; Universidade Federal de Minas Gerais; Av. Pres. Antônio Carlos, 6627, Campus Pampulha CEP 31270-901 Belo Horizonte MG Brazil
- Department of Chemistry; Université Laval; Pavillon Alexandre-Vachon, 1045 Avenue de la Médecine G1V 0A6 Quebec City, Quebec Canada
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