251
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Wu QX, Crews MS, Draskovic M, Sohn J, Johnson TA, Tenney K, Valeriote FA, Yao XJ, Bjeldanes LF, Crews P. Azonazine, a novel dipeptide from a Hawaiian marine sediment-derived fungus, Aspergillus insulicola. Org Lett 2010; 12:4458-61. [PMID: 20866076 PMCID: PMC2953366 DOI: 10.1021/ol101396n] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Azonazine, a unique hexacyclic dipeptide, was isolated from a Hawaiian marine sediment-derived fungus eventually identified as Aspergillus insulicola. Its absolute configuration, 2R,10R,11S,19R, was established using NMR, HRESIMS, and CD data plus insights derived from molecular models. A possible route for its biogenesis is proposed, and biological properties were explored against cancer cell lines and in an NFκB inhibition assay.
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Affiliation(s)
- Quan-Xiang Wu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Mitchell S. Crews
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Marija Draskovic
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | - Johann Sohn
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Tyler A. Johnson
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Karen Tenney
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
| | | | - Xiao-Jun Yao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Leonard F. Bjeldanes
- Department of Nutritional Sciences and Toxicology, University of California Berkeley, CA 94720
| | - Phillip Crews
- Department of Chemistry and Biochemistry, University of California Santa Cruz, CA 95064
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252
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Yuan WH, Liu M, Jiang N, Guo ZK, Ma J, Zhang J, Song YC, Tan RX. Guignardones A-C: Three Meroterpenes from Guignardia mangiferae. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000916] [Citation(s) in RCA: 32] [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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253
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Bertucci C, Guimarães LFL, Bonato PS, Borges KB, Okano LT, Mazzeo G, Rosini C. Assignment of the absolute configuration at the sulfur atom of thioridazine metabolites by the analysis of their chiroptical properties: The case of thioridazine 2-sulfoxide. J Pharm Biomed Anal 2010; 52:796-801. [DOI: 10.1016/j.jpba.2010.01.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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254
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Capdevila MG, Benfatti F, Zoli L, Stenta M, Cozzi PG. Merging Organocatalysis with an Indium(III)-Mediated Process: A Stereoselective α-Alkylation of Aldehydes with Allylic Alcohols. Chemistry 2010; 16:11237-41. [DOI: 10.1002/chem.201001693] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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255
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Lunazzi L, Mancinelli M, Mazzanti A, Pierini M. Stereomutation of Axially Chiral Aryl Coumarins. J Org Chem 2010; 75:5927-33. [DOI: 10.1021/jo101261k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lodovico Lunazzi
- Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
| | - Michele Mancinelli
- Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
| | - Andrea Mazzanti
- Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, Bologna 40136, Italy
| | - Marco Pierini
- Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Università “La Sapienza”, Piazzale A. Moro, 5, Roma, Italy
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256
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Vintonyak V, Warburg K, Kruse H, Grimme S, Hübel K, Rauh D, Waldmann H. Identification of Thiazolidinones Spiro-Fused to Indolin-2-ones as Potent and Selective Inhibitors of the Mycobacterium tuberculosis Protein Tyrosine Phosphatase B. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002138] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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257
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Mazzeo G, Giorgio E, Zanasi R, Berova N, Rosini C. Absolute Configuration through the DFT Simulation of the Optical Rotation. Importance of the Correct Selection of the Input Geometry: A Caveat. J Org Chem 2010; 75:4600-3. [DOI: 10.1021/jo100401w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Giuseppe Mazzeo
- Dipartimento di Chimica, Università della Basilicata, via N. Sauro 85, 85100, Potenza, Italy
| | - Egidio Giorgio
- Dipartimento di Chimica, Università della Basilicata, via N. Sauro 85, 85100, Potenza, Italy
| | - Riccardo Zanasi
- Dipartimento di Chimica, Università degli Studi di Salerno, via Ponte don Melillo, 84084, Fisciano, Salerno, Italy
| | - Nina Berova
- Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027
| | - Carlo Rosini
- Dipartimento di Chimica, Università della Basilicata, via N. Sauro 85, 85100, Potenza, Italy
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258
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Pescitelli G, Kurtán T, Flörke U, Krohn K. Absolute structural elucidation of natural products--a focus on quantum-mechanical calculations of solid-state CD spectra. Chirality 2010; 21 Suppl 1:E181-201. [PMID: 19902530 DOI: 10.1002/chir.20795] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this review article we examine state-of-the-art techniques for the structural elucidation of organic compounds isolated from natural sources. In particular, we focus on the determination of absolute configuration (AC), perhaps the most challenging but inevitable step in the whole process, especially when newly isolated compounds are screened for biological activity. Among the many methods employed for AC assignment that we review, special attention is paid to electronic circular dichroism (CD) and to the modern tools available for quantum-mechanics CD predictions, including TDDFT. In this context, we stress that conformational flexibility often poses a limit to practical CD calculations of solution CD spectra. Many crystalline natural products suitable for X-ray analysis do not contain heavy atoms for a confidential AC assignment by resonant scattering. However, their CD spectra can be recorded in the solid state, for example with the KCl pellet technique, and analyzed possibly by nonempirical means to provide stereochemical information. In particular, solid-state CD spectra can be compared with those calculated with TDDFT or other high-level methods, using the X-ray geometry as input. The solid-state CD/TDDFT approach, described in detail, represents a quick and reliable tool for AC assignment of natural products.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Pisa, Italy.
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259
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Wu XF, Hu YC, Yu SS, Jiang N, Ma J, Tan RX, Li Y, Lv HN, Liu J, Ma SG. Lysidicins F−H, Three New Phloroglucinols from Lysidice rhodostegia. Org Lett 2010; 12:2390-3. [DOI: 10.1021/ol100735f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xian-Fu Wu
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - You-Cai Hu
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Shi-Shan Yu
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Nan Jiang
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Jing Ma
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Ren-Xiang Tan
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Yong Li
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Hai-Ning Lv
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Jing Liu
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
| | - Shuang-Gang Ma
- Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, P. R. China, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China, and State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University,
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260
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Xu M, Bruhn T, Hertlein B, Brun R, Stich A, Wu J, Bringmann G. Shuangancistrotectorines A-E, Dimeric Naphthylisoquinoline Alkaloids with Three Chiral Biaryl Axes from the Chinese PlantAncistrocladus tectorius. Chemistry 2010; 16:4206-16. [DOI: 10.1002/chem.200903247] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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261
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Casarini D, Lunazzi L, Mazzanti A. Recent Advances in Stereodynamics and Conformational Analysis by Dynamic NMR and Theoretical Calculations. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901340] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniele Casarini
- Department of Chemistry, University of Basilicata, via Nazario Sauro 85, 85100 Potenza, Italy
| | - Lodovico Lunazzi
- Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy, Fax: +39‐051‐2093654
| | - Andrea Mazzanti
- Department of Organic Chemistry “A. Mangini”, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy, Fax: +39‐051‐2093654
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262
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On- and off column enantiomerization of 4,4′-bisquinolin-2-ones: A comparison of Auto-, DHPLcy2k and DCXplorer calculated thermodynamic data generated by dynamic high, performance liquid chromatography with theoretically calculated data. J Chromatogr A 2010; 1217:1017-23. [DOI: 10.1016/j.chroma.2009.12.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Revised: 11/27/2009] [Accepted: 12/01/2009] [Indexed: 11/21/2022]
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263
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Götz DCG, Bruhn T, Senge MO, Bringmann G. Synthesis and stereochemistry of highly unsymmetric beta,meso-linked porphyrin arrays. J Org Chem 2010; 74:8005-20. [PMID: 19705809 DOI: 10.1021/jo901483q] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Porphyrin arrays with tailor-made photophysical properties and well-defined three-dimensional geometries constitute attractive synthetic targets in porphyrin chemistry. The paper describes a variable, straightforward synthetic procedure for the construction of beta,meso-linked porphyrin multichromophores in good to excellent yields. In a Suzuki-type coupling reaction beta-borylated 5,10,15,20-tetraarylporphyrins (TAPs) served as versatile building blocks for the preparation of a plethora of directly linked, unsymmetrically substituted di- and triporphyrins. Besides their interesting photophysical properties, especially the trimeric porphyrin arrays show exciting stereochemical features. The established protocols thus open a convenient entry into the synthesis of achiral and chiral, unsymmetrically substituted beta,meso-linked oligoporphyrins, e.g., for applications in biomedicine or nonlinear optics.
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Affiliation(s)
- Daniel C G Götz
- Institute of Organic Chemistry and Rontgen Research Center for Complex Material Systems, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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264
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Masullo M, Bassarello C, Bifulco G, Piacente S. Polyisoprenylated benzophenone derivatives from the fruits of Garcinia cambogia and their absolute configuration by quantum chemical circular dichroism calculations. Tetrahedron 2010. [DOI: 10.1016/j.tet.2009.11.034] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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265
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Coluccini C, Mazzanti A, Pasini D. Locked chromophores as CD and NMR probes for the helical conformation of tetraamidic macrocycles. Org Biomol Chem 2010; 8:1807-15. [DOI: 10.1039/b924400j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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266
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Companyó X, Zea A, Alba ANR, Mazzanti A, Moyano A, Rios R. Organocatalytic synthesis of spiro compounds via a cascade Michael–Michael-aldol reaction. Chem Commun (Camb) 2010; 46:6953-5. [DOI: 10.1039/c0cc01522a] [Citation(s) in RCA: 206] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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267
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Bergonzini G, Gramigna L, Mazzanti A, Fochi M, Bernardi L, Ricci A. Organocatalytic asymmetric Povarov reactions with 2- and 3-vinylindoles. Chem Commun (Camb) 2010; 46:327-9. [DOI: 10.1039/b921113f] [Citation(s) in RCA: 156] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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268
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Autschbach J, Nitsch-Velasquez L, Rudolph M. Time-dependent density functional response theory for electronic chiroptical properties of chiral molecules. Top Curr Chem (Cham) 2010; 298:1-98. [PMID: 21321799 DOI: 10.1007/128_2010_72] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Methodology to calculate electronic chiroptical properties from time-dependent density functional theory (TDDFT) is outlined. Applications of TDDFT to computations of electronic circular dichroism, optical rotation, and optical rotatory dispersion are reviewed. Emphasis is put on publications from 2005 to 2010, but much of the older literature is also cited and discussed. The determination of the absolute configuration of chiral molecules by combined measurements and computations is an important application of TDDFT chiroptical methods and discussed in some detail. Raman optical activity (ROA) spectra are obtained from normal-mode derivatives of the optical rotation tensor and other linear response tensors. A few selected (ROA) benchmarks are reviewed.
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Affiliation(s)
- Jochen Autschbach
- Department of Chemistry, University at Buffalo State University of New York, New York, NY, USA.
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269
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Bringmann G, Gulder T, Hertlein B, Hemberger Y, Meyer F. Total Synthesis of the N,C-Coupled Naphthylisoquinoline Alkaloids Ancistrocladinium A and B and Related Analogues. J Am Chem Soc 2009; 132:1151-8. [DOI: 10.1021/ja9097687] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Tanja Gulder
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Barbara Hertlein
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Yasmin Hemberger
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Frank Meyer
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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270
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Balaban TS, Bhise AD, Bringmann G, Bürck J, Chappaz-Gillot C, Eichhöfer A, Fenske D, Götz DCG, Knauer M, Mizoguchi T, Mössinger D, Rösner H, Roussel C, Schraut M, Tamiaki H, Vanthuyne N. Mimics of the self-assembling chlorosomal bacteriochlorophylls: regio- and stereoselective synthesis and stereoanalysis of acyl(1-hydroxyalkyl)porphyrins. J Am Chem Soc 2009; 131:14480-92. [PMID: 19769331 DOI: 10.1021/ja905628h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Diacylation of copper 10,20-bis(3,5-di-tert-butylphenylporphyrin) using Friedel-Crafts conditions at short reaction times, high concentrations of catalyst, and 0-4 degrees C affords only the 3,17-diacyl-substituted porphyrins, out of the 12 possible regioisomers. At longer reaction times and higher temperatures, the 3,13-diacyl compounds are also formed, and the two isomers can be conveniently separated by normal chromatographic techniques. Monoreduction of these diketones affords in good yields the corresponding acyl(1-hydroxyalkyl)porphyrins, which after zinc metalation are mimics of the natural chlorosomal bacteriochlorophyll (BChl) d. Racemate resolution by HPLC on a variety of chiral columns was achieved and further optimized, thus permitting easy access to enantiopure porphyrins. Enantioselective reductions proved to be less effective in this respect, giving moderate yields and only 79% ee in the best case. The absolute configuration of the 3(1)-stereocenter was assigned by independent chemical and spectroscopic methods. Self-assembly of a variety of these zinc BChl d mimics proves that a collinear arrangement of the hydroxyalkyl substituent with the zinc atom and the carbonyl substituent is not a stringent requirement, since both the 3,13 and the 3,17 regioisomers self-assemble readily as the racemates. Interestingly, the separated enantiomers self-assemble less readily, as judged by absorption, fluorescence, and transmission electron microscopy studies. Circular dichroism spectra of the self-assemblies show intense Cotton effects, which are mirror-images for the two 3(1)-enantiomers, proving that the supramolecular chirality is dependent on the configuration at the 3(1)-stereocenter. Upon disruption of these self-assemblies with methanol, which competes with zinc ligation, only very weak monomeric Cotton effects are present. The favored heterochiral self-assembly process may also be encountered for the natural BChls. This touches upon the long-standing problem of why both 3(1)-epimers are encountered in BChls in ratios that vary with the illumination and culturing conditions.
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Affiliation(s)
- Teodor Silviu Balaban
- Institute for Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, D-76021 Karlsruhe, Germany.
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271
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Mazzeo G, Scafato P, Superchi S, Rosini C. The absolute configuration of simple aliphatic alcohols through a chemical/computational approach: triarylether derivatives of (+)-endo-2-norborneol as a case study. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.10.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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272
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Cachet N, Genta-Jouve G, Regalado EL, Mokrini R, Amade P, Culioli G, Thomas OP. Parazoanthines A-E, hydantoin alkaloids from the Mediterranean sea anemone Parazoanthus axinellae. JOURNAL OF NATURAL PRODUCTS 2009; 72:1612-1615. [PMID: 19708637 DOI: 10.1021/np900437y] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Five new hydantoin alkaloids, named parazoanthines A-E (1-5), were isolated as the major constituents of the Mediterranean sea anemone Parazoanthus axinellae. Their structural elucidation was achieved through NMR spectroscopic and mass spectrometric analyses. The absolute configuration of the chiral compounds 1 and 4 was determined by comparison between experimental and TDDFT-calculated CD spectra. The configuration of the trisubstituted double bond of 2, 3, and 5 was deduced from the (3)J(H6-C4) coupling constant value. This family of alkaloids represents the first example of natural 3,5-disubstituted hydantoins that do not exhibit a methyl at N-3. All compounds were tested for their natural toxicity (Microtox assay), and parazoanthine C (3) exhibited the highest natural toxicity.
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Affiliation(s)
- Nadja Cachet
- Laboratoire de Chimie des Molecules Bioactives et des Aromes, Institut de Chimie de Nice, Faculte des Science, Universite de Nice-Sophia Antipolis, UMR 6001 CNRS, Parc Valrose, Nice Cedex 02, France
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273
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Polavarapu PL, Petrovic AG, Vick SE, Wulff WD, Ren H, Ding Z, Staples RJ. Absolute Configuration of 3,3′-Diphenyl-[2,2′-binaphthalene]-1,1′-diol Revisited. J Org Chem 2009; 74:5451-7. [DOI: 10.1021/jo901013z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Ana G. Petrovic
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235
| | - Sarah E. Vick
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235
| | - William D. Wulff
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
| | - Hong Ren
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
| | - Zhensheng Ding
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
| | - Richard J. Staples
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824
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274
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Gioia C, Fini F, Mazzanti A, Bernardi L, Ricci A. Organocatalytic Asymmetric Formal [3 + 2] Cycloaddition with in Situ-Generated N-Carbamoyl Nitrones. J Am Chem Soc 2009; 131:9614-5. [DOI: 10.1021/ja902458m] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Claudio Gioia
- Department of Organic Chemistry “A. Mangini”, University of Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Francesco Fini
- Department of Organic Chemistry “A. Mangini”, University of Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Andrea Mazzanti
- Department of Organic Chemistry “A. Mangini”, University of Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Luca Bernardi
- Department of Organic Chemistry “A. Mangini”, University of Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Alfredo Ricci
- Department of Organic Chemistry “A. Mangini”, University of Bologna, viale Risorgimento 4, 40136 Bologna, Italy
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Autschbach J. Computing chiroptical properties with first-principles theoretical methods: Background and illustrative examples. Chirality 2009; 21 Suppl 1:E116-52. [DOI: 10.1002/chir.20789] [Citation(s) in RCA: 273] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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