Results 21 to 30 of about 291 (140)
3-Amino-2H-azirine, Moleküle mit vielfältigen Reaktionsmöglichkeiten
CHIMIA, 1979 3-Amino-2H-azirines, cyclic three-membered amidines with an estimated ring strain of about 200 kJ/mole, undergo a variety of reactions. Thereby, each of the azirine bonds can be broken: Thermolysis leads to the rupture of the C(2),C(3)-bond, with strong
Heinz Heimgartner
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Bortrifluorid-katalysierte Umsetzung von 2H-Azirinen und Vinylaziden mit Nitrilen
CHIMIA, 1975 The reaction of 2H-azirines or vinyl azides with nitriles in the presence of boron trifluoride etherate, to yield the corresponding imidazoles (see table), is described.
Heinz Bader, Hans-Jürgen Hansen
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Synthesis of 2-(Trifluoromethyl)Azetidines by Strain-Release Reactions of 2-(Trifluoromethyl)-1-Azabicyclo[1.1.0]Butanes. [PDF]
Chemistry2‐(Trifluoromethyl)‐1‐azabicyclo[1.1.0]butanes, available by diastereoselective cyclopropanation of 2‐(trifluoromethyl)‐2H‐azirines, can be successfully involved in strain‐release ring‐opening processes, as illustrated by their reaction with benzyl chloroformate, trifluoroacetic anhydride or palladium‐catalyzed hydrogenolysis.
Scuiller A +7 more
europepmc +2 more sources
Stabile Zink-Komplexe von 3-Amino-2H-azirinen
CHIMIA, 1978 3-Dimethylamino-2,2-dimethyl-2H-azirine (4a), which is known to react easily with Brönsted acids and electrophiles, forms a stable complex 5a with ZnBr2. In contrast to all other reactions of 4a, the three-membered ring in this complex is preserved. The
Kurt Dietliker +3 more
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Synthetic Strategies to Access Fluorinated Azoles. [PDF]
European J Org ChemThis review highlights recent synthetic strategies for introducing fluorine groups (mono‐, di‐, and trifluoromethylation) into 11 major azole classes, identifying research gaps to inform future innovations in materials science, medicinal chemistry, and biomedical research.
El-Gaber MKA +4 more
europepmc +2 more sources
Chemical Metabolomics: Chemical Biology Tools for Advanced Metabolism Investigations
Angewandte Chemie, Volume 138, Issue 23, 1 June 2026.The human metabolism has been investigated for several millennia. The metabolome is known for a high complexity due to a large number of different metabolites that are present at different concentrations. Metabolomics has been developed as a field to investigate the entire human metabolome and to elucidate disease development mechanisms.
Alejandro Torregrosa‐Chinillach +4 more
wiley +2 more sources
Neuere Methoden zur Ringerweiterung organischer Verbindungen
CHIMIA, 1980 The actual interest in the construction of cyclic compounds via ring expansion reactions is demonstrated in the first chapter by means of typical examples.
Heinz Heimgartner
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2H-Pyrrole und Pyrrole aus 3-Phenyl-2H-azirinen
CHIMIA, 1976 Vinyl-phosphonium salts [2] and phenyl-vinyl-sulfone or divinylsulfone react with benzonitril-methylides a (which are photochemically generated from 3-phenyl-2H-azirines 1 and 2) to give, via the nonisolated intermediates of type b, 2H-pyrrole 4 and the
Ulrich Widmer +4 more
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Pyridonderivate aus 3-Amino-2H-azirinen und Cyclopropenonen
CHIMIA, 1978 Reaction of the 3-dimethylamino-2H-azirines 1a and 1b with diphenylcyclopropenone (2a) in ether or acetonitrile leads to the 2-dimethylamino-5,6-diphenyl-4(3H)-pyridones 3a and 3b in 70 and 80% yield, respectively. The structure of these 1:1-adducts has
Stanislav Chaloupka, Heinz Heimgartner
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Late‐Stage Functionalization of Peptides on the Solid Phase
Angewandte Chemie International Edition, EarlyView.Peptide modifications are essential to control pharmacodynamic and pharmacokinetic properties of peptide drugs. Consequently, strategies that allow for efficient and rapid incorporation of non‐canonical modifications into peptides in parallel formats are highly sought after.
Marius Werner +2 more
wiley +1 more source