Results 21 to 30 of about 1,246 (202)

Copper(II)-Catalyzed (3+2) Cycloaddition of 2H-Azirines to Six-Membered Cyclic Enols as a Route to Pyrrolo[3,2-c]quinolone, Chromeno[3,4-b]pyrrole, and Naphtho[1,8-ef]indole Scaffolds

Molecules, 2022
A method for the [2+3] pyrroline annulation to the six-membered non-aromatic enols using 3-aryl-2H-azirines as annulation agents is developed in the current study.
Pavel A. Sakharov, Nikolai V. Rostovskii, Alexander F. Khlebnikov, Mikhail S. Novikov   +3 more
doaj   +1 more source

Electrochemically Induced Synthesis of Imidazoles from Vinyl Azides and Benzyl Amines

Molecules, 2022
An electrochemically induced synthesis of imidazoles from vinyl azides and benzyl amines was developed. A wide range of imidazoles were obtained, with yields of 30 to 64%.
Vera A. Vil’, Sergei S. Grishin, Alexander O. Terent’ev   +2 more
doaj   +1 more source

Azirine alkylation

Tetrahedron Letters, 1976
Tetrahedron Letters 17 (1976) 1413-1414. doi:10.1016/S0040-4039(00)71270-6 ; Received by publisher: 1975-12-23 ; Harvest Date: 2016-01-04 12:20:50 ; DOI:10.1016/S0040-4039(00)71270-6 ; Page Range: 1413 ...
Department of Chemistry, University of Florida Gainesville, Florida 32611 U.S.A. ( host institution ), Deyrup, James A. ( author ), Szabo, William A. ( author )   +2 more
openaire   +2 more sources

Azirine ligation: fast and selective protein conjugation via photoinduced azirine–alkene cycloaddition [PDF]

Chemical Communications, 2010
We report a new bioorthogonal ligation reaction between p-nitrodiphenylazirine and dimethyl fumarate. This photoinduced azirine-alkene cycloaddition provides a rapid (~2 min) and highly selective route to protein conjugation at neutral pH and room temperature in biological medium.
Reyna K V, Lim, Qing, Lin
openaire   +2 more sources

Facile Synthesis of 2-Dimethylamino-Δ-1-Azirine Derivatives by Thermal or Photo-Isomerization of Isoxazoles [1]

CHIMIA, 1976
3,5-Bisdimethylamino-isoxazoles II are obtained easily from 1,3-dichloro-trimethinecyanine I and a water solution of hydroxylamine. Besides precedented photo-isomerization of 4-substituted isoxazoles IIb,c to azirines IIIb,c near quantitative thermal ...
G.J. de Voghel, T.L. Eggerichs, Brigitte Clamot, H.G. Viehe   +3 more
doaj   +1 more source

Acetyl oxime/azirine 1, 3-dipole and strategy for the regioselective synthesis of polysubstituted pyrroles via [3 + 2] cycloaddition with alkyne utilizing Fe2O3@cellulose catalyst

Results in Chemistry, 2021
Fe2O3@cellulose catalyzed regioselective [3 + 2] cycloaddition of acetyl oxime with alkynes via 2H‑azirines intermediate generated in situ in an aqueous ethanolic medium is described.
Kartikey Dhar Dwivedi, Bhupender Kumar, Marri Sameer Reddy, Biplob Borah, J. Nagendra Babu, L. Raju Chowhan   +5 more
doaj   +1 more source

Domino reactions of 2H-azirines with acylketenes from furan-2,3-diones: Competition between the formation of ortho-fused and bridged heterocyclic systems

Beilstein Journal of Organic Chemistry, 2014
3-Aryl-2H-azirines react with acylketenes, generated by thermolysis of 5-arylfuran-2,3-diones, to give bridged 5,7-dioxa-1-azabicyclo[4.4.1]undeca-3,8-diene-2,10-diones and/or ortho-fused 6,6a,12,12a-tetrahydrobis[1,3]oxazino[3,2-a:3′,2′-d]pyrazine-4,10 ...
Alexander F. Khlebnikov, Mikhail S. Novikov, Viktoriia V. Pakalnis, Roman O. Iakovenko, Dmitry S. Yufit   +4 more
doaj   +1 more source

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, Ursula Schmid, Gabriele Mukherjee-Müller, Heinz Heimgartner   +3 more
doaj   +1 more source

Investigation of phenyl azide photochemistry by conventional and time-resolved spectroscopy. Elucidation of intermediates and reaction mechanisms

Journal of Photochemistry and Photobiology, 2022
Early studies of the photochemistry of parent phenyl azide concerned the products obtained under specific experimental conditions. Depending on the products, various mechanisms and intermediates were proposed.
Elisa Leyva, Matthew S. Platz, Edgar Moctezuma   +2 more
doaj   +1 more source

2-Oxo-4H-imidazolium-1-acetamidate, neue stabilisierte Dipole aus Aminoazirinen und NH-aciden Heterocyclen

CHIMIA, 1985
3-Dimethylamino-2,2-dimethyl-2H-azirine (1) and 5-trifluoromethyl-1,3,4- oxadiazol-2(3H)-on (9) in 2-propanol react already at room temperature to give the dipolar compound 10 in reasonable yield (Scheme 4).
Roland Prewo, Jost H. Bieri, Heinz Heimgartner   +2 more
doaj   +1 more source