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Mikhova B, Stamboliyska B, Koch A, Duddeck H, Kleinpeter E. DFT-GIAO-NBO and 13C NMR study of the delta-syn-axial effect in 2,4-disubstituted adamantanes. Magn Reson Chem 2008; 46:1153-1157. [PMID: 18828152 DOI: 10.1002/mrc.2333] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Six groups of diastereomeric 2,4-disubstituted adamantanes were studied with DFT-GIAO-NBO (natural orbital analysis) methods. The calculated (13)C chemical shifts reproduce well the experimental data. It was found that among all diastereomers, those bearing substituents in delta-syn-axial positions showed the largest overall deshielding, i.e. the sum of all (13)C chemical shifts [Sigmadelta((13)C)] was the greatest and also had the highest delocalization contribution to the molecular energy evaluated with NBO. The higher delocalization energy is proposed to be the origin of the deshielding delta-syn-axial effect.
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Affiliation(s)
- B Mikhova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
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2
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Choudhary MI, Jalil S, Todorova M, Trendafilova A, Mikhova B, Duddeck H. Inhibitory effect of lactone fractions and individual components from three species of theAchillea millefoliumcomplex of Bulgarian origin on the human neutrophils respiratory burst activity. Nat Prod Res 2007; 21:1032-6. [PMID: 17691054 DOI: 10.1080/14786410701369623] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Achillea species are widely used in folk medicine for treatment of inflammatory diseases. The inhibitory effect on the human neutrophils respiratory burst activity of total extracts, their fractions and some main constituents of the flower heads from Achillea asplenifolia, A. collina and A. distans belonging to A. millefolium complex of Bulgarian origin, were tested by the modified method of Tan and Berridge. Seven from the investigated fractions showed activity similar or higher than that of indomethacine and might be evaluated as nonsteroidal anti-inflammatory agents.
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Affiliation(s)
- Muhammad Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Sciences, University of Karachi, Pakistan
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Rao MS, Kotesh J, Narukulla R, Duddeck H. Synthesis and spectroscopic characterization of some chromanochalcones and their dihydro derivatives. ARKIVOC 2004. [DOI: 10.3998/ark.5550190.0005.e10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Abstract
Fractions of methanol, dichloromethane, water extracts and volatiles of Carthamus lanatus aerial parts given by oral route at a dose of 2 mg/kg showed significant antiinflammatory activities in rats. On the contrary, only the water fraction of MeOH extract possesses a significant analgesic activity.
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Affiliation(s)
- A Bocheva
- Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Rockitt S, Magiera D, Omelańczuk J, Duddeck H. Chiral Discrimination of Organophosphorus Compounds by Multinuclear Magnetic Resonance in the Presence of a Chiral Dirhodium Complex. PHOSPHORUS SULFUR 2002. [DOI: 10.1080/10426500213426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ahmad R, Iqbal R, Akhtar H, Duddeck H, Stefaniak L, Sitkowski J. Synthesis and structure determination of some oxadiazole-2-thione and triazole-3-thione galactosides. Nucleosides Nucleotides Nucleic Acids 2001; 20:1671-82. [PMID: 11580193 DOI: 10.1081/ncn-100105903] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The syntheses of 5-pyridyl-3(beta-D-galactopyranosyl)-1,3,4-oxadiazole-2-thiones 3a-3c and 5-pyridyl-2(beta-D-galactopyranosyl)-4-benzyl-1,2, 4-triazole-3-thiones 6a-6c are reported. The existence of N-galactosides--not S-galactosides--was proven by IR and 15N NMR spectroscopy. The structures of the final products and the intermediates were elucidated by IR, 1H, 13C and 15N NMR spectroscopy and mass spectrometry.
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Affiliation(s)
- R Ahmad
- Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Kieć-Kononowicz K, Drabczyńska A, Pękala E, Michalak B, Müller CE, Schumacher B, Karolak-Wojciechowska J, Duddeck H, Rockitt S, Wartchow R. New developments in A1 and A2 adenosine receptor antagonists. PURE APPL CHEM 2001. [DOI: 10.1351/pac200173091411] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this article is to briefly present progress in the development of the potent adenosine receptor (AR) antagonists with high selectivity for either A1, A2A, or A2B ARs. The structural requirements for each AR subtype were discussed as well as their potential therapeutic use. In the search for new AR antagonists, series of imidazo-, pyrimido-, and diazepino-purindione derivatives as well as oxazolo-, oxazino-, and oxazepino-purindiones were designed, synthesized, and preliminarily evaluated in pharmacological studies. Oxygen-containing tricyclic derivatives were shown to be moderately potent AR antagonists exhibiting selectivity either for A1 or A2A ARs. Tricyclic purindiones with nitrogen in the third ring were generally more A2A AR selective. The compounds tested in vivo according to the Antiepileptic Drug Development Program of the National Institutes of Health (USA) were generally active as anticonvulsants in chemically induced seizures.
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Affiliation(s)
- K. Kieć-Kononowicz
- 1Jagiellonian University, Medical College, Department of Chemical Technology of Drugs, Medyczna 9, Pl 30-688 Kraków, Poland
| | - A. Drabczyńska
- 1Jagiellonian University, Medical College, Department of Chemical Technology of Drugs, Medyczna 9, Pl 30-688 Kraków, Poland
| | - E. Pękala
- 1Jagiellonian University, Medical College, Department of Chemical Technology of Drugs, Medyczna 9, Pl 30-688 Kraków, Poland
| | - B. Michalak
- 1Jagiellonian University, Medical College, Department of Chemical Technology of Drugs, Medyczna 9, Pl 30-688 Kraków, Poland
| | - C. E. Müller
- 2Pharmaceutical Institute Poppelsdorf, University of Bonn, Kreuzbergweg 26, D-53115 Bonn, Germany
| | - B. Schumacher
- 2Pharmaceutical Institute Poppelsdorf, University of Bonn, Kreuzbergweg 26, D-53115 Bonn, Germany
| | - J. Karolak-Wojciechowska
- 3Institute of General and Ecological Chemistry, Technical University of Łódz´, Żwirki 36, Pl 30-924 Łódz´, Poland
| | - H. Duddeck
- 4University of Hannover, Institute of Organic Chemistry, Schneiderberg 1B, D-30167 Hannover, Germany
| | - S. Rockitt
- 4University of Hannover, Institute of Organic Chemistry, Schneiderberg 1B, D-30167 Hannover, Germany
| | - R. Wartchow
- 4University of Hannover, Institute of Organic Chemistry, Schneiderberg 1B, D-30167 Hannover, Germany
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Rockitt S, Duddeck H, Omelanczuk J. First direct discrimination of chiral phosphorus thionate (P=S) derivatives by multinuclear magnetic resonance spectroscopy in the presence of a chiral dirhodium complex. Chirality 2001; 13:214-23. [PMID: 11284027 DOI: 10.1002/chir.1022] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Enantiomeric ratios of compounds with P=S functionalities can be determined by 1H, 13C, and 31P NMR spectroscopic inspection of their diastereomeric complexes with (R)-Rh2(MTPA)4 (MTPA-H identical with methoxytrifluoromethylphenylacetic acid; Mosher's acid). This is the first facile and rapid spectroscopic method for chiral recognition in this class of compounds. Whereas complexation shifts Deltadelta are moderate or even negligible, significant signal dispersions Delta(nu) can be observed. Some rationalization about the complexation mode is presented. The NMR spectral characteristics of the free P=S compounds 1-9 are described in detail.
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Affiliation(s)
- S Rockitt
- Hannover University, Institute of Organic Chemistry, Hannover, Germany
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Abstract
The structure elucidation of a new saponin from Arenaria filicaulis (Boiss.), Caryophyllaceae, Snatzkein F (1), containing gypsogenin with a tetrasaccharide moiety was accomplished by use of 1D and 2D NMR methods.
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Affiliation(s)
- HS Soliman
- Pharmacognosy Department, Faculty of Pharmacy, Helwan University, Ain-Helwan, Cairo, Egypt, Laboratory of Natural Products, National Research Centre, Dokki-Cairo, Egypt, Technical Analytical Research Group of the Hungarian Academy of Sciences, In
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Abstract
The structure of crotaramosmin has been reassigned to 1-(5-hydroxy-2, 2-dimethyl-2H-chromen-6-yl)-3-(4-hydroxyphenyl)-propanone (1) as determined by extensive NMR investigation.
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Affiliation(s)
- MS Rao
- Department of Chemistry, Kakatiya University, Warangal, 506009 Andra Pradesh, India, Technical Analytical Research Group of the Hungarian Academy of Sciences, Institute for General and Analytical Chemistry of the Technical University, Szent Gellert t
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Abstract
Two novel triterpenoid saponins, Snatzkein C, (3beta, 20-dihydroxylupan-28-oic acid 3-O-[beta-D-galactopyranosyl-(1-->2)-beta-D-glucopyranosyl-28- O-beta-D-glucopyranoside) and Snatzkein D, (3beta, 20-dihydroxylupan-28-oic acid 3-O-[beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl]-28-O-beta-D-++ +glucopyranoside), have been isolated from Arenaria filicaulis. Their structure and conformational behaviour were elucidated by one- and two-dimensional 1H NMR and 13C NMR spectroscopy.
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Affiliation(s)
- M H Elgamal
- National Research Centre, Laboratory of Natural Products, Dokki-Cairo, Egypt
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Uzoukwu BA, Gloe K, Duddeck H. EXTRACTION OF URANIUM(VI) AND VANADIUM(V) WITH 4-ADIPOYL AND 4-SEBACOYL DERIVATIVES OF BIS(1-PHENYL-3-METHYL-PYRAZOLONE-5) AND EFFECT OF DECANOL ON THE DISTRIBUTION BEHAVIOUR OF THESE METAL IONS. Solvent Extraction and Ion Exchange 1998. [DOI: 10.1080/07366299808934551] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Uzoukwu BA, Gloe K, Duddeck H. 4-Acylpyrazoloneiminjz Schiff Bases and Their Metal Complexes: Synthesis and Spectroscopic Studies. ACTA ACUST UNITED AC 1998. [DOI: 10.1080/00945719809349384] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Affiliation(s)
- B Singh
- CSIR Complex, Palampur 176062, India
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Balzer G, Duddeck H, Fleischer U, Röhr F. 77 Se shielding tensors of diphenyl diselenide, comparison of the results from CP/MAS NMR spectroscopy and IGLO calculations. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s002160050194] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lazarevski G, Kobrehel G, Metelko B, Duddeck H. Ring opening reactions of 6-deoxy-9-deoxo-9a-aza-9a-homoerythromycin A 6,9-cyclic imino ether. J Antibiot (Tokyo) 1996; 49:1066-9. [PMID: 8968405 DOI: 10.7164/antibiotics.49.1066] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Abstract
Four novel triterpenoid saponins have been isolated from Gypsophila capillaris. Three were monodesmosidic: 3 beta-hydroxyolean-12-en-23,28-dioic acid 28-O-[beta-D-glucopyranosyl-(1-->3)-beta-D-glucopyranosyl-(1-->2)] [beta-D-galactopyranosyl(1-->6)]beta-D-glucopyranoside, 3 beta-hydroxyolean-12-en-23-oxo-28-oic acid 28-O-[beta-D-glucopyranosyl-(1-->2)-beta-D-galactopyranosyl-(1-->3)] [beta-D-glucopyranosyl(1-->6)]beta-D-galactopyranoside, 3 beta-hydroxyolean-12-en-23,28-dioic acid 28-O-[beta-D-glucopyranosyl-(1-->2)-beta-D-galactopyranosyl-(1-->3)] [beta-D-glucopyranosyl(1-->6)]beta-D-galactopyranoside. The fourth was bisdesmosidic: 3 beta-hydroxyolean-12-en-23,28-dioic acid 23-O-beta-D-glucopyranosyl-28-O-[beta-D-glucopyranosyl-(1-->2)-beta-D- galactopyranosyl-(1-->3)][beta-D-glucopyranosyl-(1-->6)]beta-D- galactopyranoside. The structures of the compounds were elucidated by 1D and 2D NMR techniques and from other spectroscopic evidence.
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Affiliation(s)
- M H Elgamal
- National Research Centre, Laboratory of Natural Products, Dokki-Cairo, Egypt
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Abstract
Five pentacyclic triterpenoids have been isolated from the minor constituents of local liquorice roots, one of them has not been isolated before from liquorice root. Their structural formulae and stereochemical configuration was determined by spectroscopic methods. 13C and 1H NMR data have been compiled.
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Affiliation(s)
- M H Elgamal
- National Research Centre, Laboratory of Natural Products, Dokki-Cairo, Egypt
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Abou-Mustafa EA, Saleh NA, Elgamal MH, Shalaby NM, Duddeck H. A Further Contribution to the gamma-Pyrone Constituents of Ammi visnaga Fruits. Planta Med 1990; 56:134. [PMID: 17221392 DOI: 10.1055/s-2006-960912] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Affiliation(s)
- E A Abou-Mustafa
- National Research Centre, Laboratory of Natural Products, El-Tahrir St, El-Dokki, Cairo, Egypt
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Khalid SA, Yagi SM, Khristova P, Duddeck H. (+)-Catechin-5-galloyl Ester as a Novel Natural Polyphenol from the Bark of Acacia nilotica of Sudanese Origin1. Planta Med 1989; 55:556-8. [PMID: 17262478 DOI: 10.1055/s-2006-962094] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
From the bark of ACACIA NILOTICA subsp. TOMENTOSA a novel polyphenol, (+)-catechin-5-galloyl ester ( 5), was isolated along with gallic acid ( 1), its methyl ester ( 2), naringenin ( 3), and (+)-catechin ( 4). The structure of 5 was determined by use of mass spectrometry as well as (1)H- and (13)C-NMR spectroscopy.
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Affiliation(s)
- S A Khalid
- Department of Pharmacognosy, Faculty of Pharmacy, University of Khartoum, P. O. Box 1996, Khartoum, Sudan
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Lipták A, Kerékgyártó J, Szurmai Z, Duddeck H. Synthesis of the tetrasaccharide core region of antigenic lipo-oligosaccharides characteristic of Mycobacterium kansasii. Carbohydr Res 1988; 175:241-8. [PMID: 3401879 DOI: 10.1016/0008-6215(88)84146-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The oligosaccharide core region, beta-D-Glcp-(1----3)-beta-D-Glcp-(1----4)-alpha-D-Glcp- 1----1)-alpha-D-Glcp (1), of the lipo-oligosaccharide-type antigens isolated from M. kansasii has been synthesised from 2,3,2',3',4',6'-hexa-O-benzyl-6-O-(1-phenylethyl)-alpha, alpha-trehalose (4). Compound 4 was obtained by LiAlH4-AlCl3-type hydrogenolysis of 2,3,2',3',4',6'-hexa-O-benzyl-4,6-O-(S)-(1-phenylethylidene)-alpha , alpha-trehalose. The beta-laminaribiosyl part of the molecule was built-up by sequential glycosylation steps using 2,4,6-tri-O-acetyl-3-O-allyl-alpha-D-glucopyranosyl bromide in the presence of HgBr2 and methyl 2,3,4,6-tetra-O-acetyl-1-thio-beta-D-glucopyranoside promoted by methyl triflate. The complete a priori 13C-n.m.r. spectrum assignment of 1 was achieved by applying 2D methods.
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Affiliation(s)
- A Lipták
- Institute of Biochemistry, L. Kossuth University, Debrecen, Hungary
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Mikhova B, Spassov S, Popandova K, Dryanska V, Ivanov C, Duddeck H, Kaiser M. NMR spectra and stereochemistry of some 2,3,4,5-tetrasubstituted pyrrolidines. J Mol Struct 1987. [DOI: 10.1016/0022-2860(87)85077-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lipták A, Szabó L, Kerékgyártó J, Harangi J, Nánási P, Duddeck H. Synthesis of the tetrasaccharide repeating-unit of the lipopolysaccharide isolated from Pseudomonas maltophilia. Carbohydr Res 1986; 150:187-97. [PMID: 3756956 DOI: 10.1016/0008-6215(86)80015-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The title tetrasaccharide having the structure 3-O-Me-beta-L-Xylp-(1----4)- alpha-L-Rhap-(1----4)-alpha-L-Rhap-(1----2)-L-Rhap was obtained by reaction of the alpha-acetobromo derivative of 4-O-(3-O-methyl-beta-L-xylopyranosyl)-L-rhamnopyranose and benzyl 3,4-di-O-benzyl-2-O-(2,3-O-isopropylidene-alpha-L-rhamnopyranosyl)- alpha-L-rhamnopyranoside, followed by removal of the protecting groups. The synthesised compounds were characterised on the basis of n.m.r. data.
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Kříž J, Březina M, Brosch D, Vodička L, Duddeck H. Separation of isomeric halogenobicyclononene carbonitriles. J Chromatogr A 1985. [DOI: 10.1016/s0021-9673(01)95496-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Welzel P, Knupp G, Witteler F, Schubert T, Duddeck H, Müller D, Höfle G. Moenomycin a: spaltung des antibiotikums mit trifluoressigsäure/2-propanol und bestimmung der verknüpfung von d-glucose und 2-acetamido-2-desoxy-d-glucose. Tetrahedron 1981. [DOI: 10.1016/s0040-4020(01)97721-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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