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1. |
Graphical Abstract (Angew. Chem. Int. Ed. Engl. 18/1995) |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 1913-1919
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ISSN:0570-0833
DOI:10.1002/anie.199519131
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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2. |
Chemistry of Inositol Lipid Mediated Cellular Signaling |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 1933-1972
Barry V. L. Potter,
Dethard Lampe,
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摘要:
AbstractIt is now slightly more than a decade since Michael Berridge and his collaborators reported inNature“…micromolar concentrations of Ins(1,4,5)P3(1D‐myo‐inositol 1,4,5‐trisphosphate) release Ca2+from a non‐mitochondrial intracellular Ca2+store in pancreatic acinar cells. Our results strongly suggest that this is the same Ca2+store that is released by acetylcholine”. This observation ushered in an a new era in the field of signal transduction with the discovery of a small‐molecule second messenger liniking the spatially separated events of cell surface receptor activation and intracellular Ca2+mobilization. This event, which has spawned what is now one of the most active fields of current biology, also stimulated a renaissance in inositol and inositol phosphate chemistry. The synthesis of inositol polyphosphates presents a number of problems: the regiospecific protection of inositol and the optical resolution of the resulting precursors, the phosphorylation of the polyol, removal of all phosphate protecting groups without phosphate migration, and finally the purification of the water‐soluble target polyanion. With the solution of these problems over the last few years it is now possible to look beyond the synthesis of naturally occurring inositol polyphosphates, whose number has been steadily increasing, to the design of chemically modified inositol phosphate analogues with the prospect of developing enzyme inhibitors, rationally modified receptor ligands and antagonists, and perhaps, through pharmacological intervention in signal transduction pathways, even the therapeutical age
ISSN:0570-0833
DOI:10.1002/anie.199519331
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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3. |
CH and CC Bond Activation by Bare Transition‐Metal Oxide Cations in the Gas Phase |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 1973-1995
Detlef Schröder,
Helmut Schwarz,
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摘要:
AbstractOver the last decade the gas‐phase chemistry of bare transition‐metal oxide cations MO+has received considerable attention. This interest is primarily due to the particular role of metal oxides in the oxidation of organic compounds in a variety of chemical and biochemical transformations. At a molecular level the simplest model system for these processes deals with reactions of bare metal‐oxide ions in the gas phase. Due to the high oxophilicities of the early transition metals, their monoxide cations MO+do not mediate O‐atom transfer to any organic compounds at all. In contrast, monoxide cations of late transition metal can oxygenate a variety of hydro‐carbons, and the most reactive ions, MnO+, FeO+, NiO+, OsO+, and PtO+, even activate methane. Insight into the reaction mechanisms of these oxidation processes can be obtained by analysis of reaction kinetics, isotope effects, product distributions etc., and for the reactions of MO+with alkanes the initial CH bond activation by MO+is often rate‐determining. Interestingly, the high reactivity of some MO+ions is not always associated with a decrease in regioselectivity; for example, FeO+ions induce regiospecific γ‐CH bond activation of dialkylketones in the gas phase. The situation for the epoxidation of olefins in the gas phase turns out to be even more complex than for condensedphase analogues. This is primarily because the metal ion that mediates O‐atom transfer to the olefin also catalyzes the isomerization of the epoxides formed, to afford the energetically more stable aldehydes or ketones. Aromatic compounds can also be hydroxylated by MO+ions, and particularly the oxidation of benzene by bare FeO+ions in the gas phase reveals striking parallels to the metabolism of arenes. Furthermore, the storing capabilities of ion cyclotron resonance mass spectrometers even permit the design of catalytic processes in which a single metal ion converts more than one substrate molecule into an oxygenated product in a sequence of strictly bimolecular reactions. The most outstanding examples are the Pt+‐mediated oxidation of methane by molecular oxygen and the Co+‐mediated hydroxylation of benzene by N2O as oxidant. Finally, the key features of the gas‐phase reactions are compared with observations in condensed‐phase systems in which metal oxides are anticipated as central intermediates. The result of this comparison is promising in the sense that, in general, the understanding of transition‐metal‐mediated oxidations in the gas phase may lead to a more uniform description of these processes at a molecular level. Ultimately, it is hoped that gas‐phase studies will serve as one of the building blocks in the
ISSN:0570-0833
DOI:10.1002/anie.199519731
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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4. |
Terminal E1Ligands from Elements of Group 15 |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 1997-1999
Manfred Scheer,
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ISSN:0570-0833
DOI:10.1002/anie.199519971
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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5. |
Endotoxin Antagonists: Possible Candidates for the Treatment of Gram‐Negative Sepsis |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2000-2002
Otto Holst,
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ISSN:0570-0833
DOI:10.1002/anie.199520001
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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6. |
The Metallic Bond—Dead or Alive? A Comment and a Reply |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2003-2003
Leland C. Allen,
Jeremy K. Burdett,
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ISSN:0570-0833
DOI:10.1002/anie.199520031
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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7. |
The Metallic Bond—Dead or Alive? A Comment and a Reply |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2004-2004
J. Christian Schön,
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ISSN:0570-0833
DOI:10.1002/anie.199520041
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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8. |
Chiral Titanium Alkoxides as Catalysts for the Enantioselective Reduction of Ketones with Boranes |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2005-2006
Guido Giffels,
Claus Dreisbach,
Udo Kragl,
Michael Weigerding,
Herbert Waldmann,
Christian Wandrey,
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ISSN:0570-0833
DOI:10.1002/anie.199520051
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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9. |
Diastereoselective Cathodic Cyclization of 1‐(4‐ and 1‐(3‐Oxoalkyl)pyridinium Salts to Quinolizidine and Indolizidine Derivatives |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2007-2009
Rüdiger Gorny,
Hans J. Schäfer,
Roland Fröhlich,
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ISSN:0570-0833
DOI:10.1002/anie.199520071
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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10. |
Automerizations and Isomerizations in Propynylidene (HCCCH), Propadienylidene (H2CCC), and Cyclopropenylidene (c‐C3H2) |
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Angewandte Chemie International Edition in English,
Volume 34,
Issue 18,
1995,
Page 2009-2012
Randal A. Seburg,
Robert J. McMahon,
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PDF (478KB)
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ISSN:0570-0833
DOI:10.1002/anie.199520091
出版商:Hüthig&Wepf Verlag
年代:1995
数据来源: WILEY
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