Results 31 to 40 of about 1,721 (198)

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

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

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

Diels–alder reactions of alkyl 2H-azirine-3-carboxylates with furans [PDF]

, 2001
Methyl 2-(2,6-dichlorophenyl)-2H-azirine-3-carboxylate 1 and furan give the aziridine 2 by a Diels–Alder cycloaddition reaction. The hydrolysis of compound 2 leads to a dihydrofuranol 11 by cleavage of a C–N bond.
Alves, M. José, Azóia, Nuno G., Bickley, Jamie F., Fortes, A. Gil, Gilchrist, Thomas L., Mendonça, Ricardo   +5 more
core   +1 more source

Stereoselective cycloaddition of 1-glucosyl-1,3-butadienes with tert-butyl 2H-azirine-3-carboxylate, glyoxylates and imines [PDF]

, 2003
Glucosyl dienes 1 have been reacted with the achiral 2H-azirine 4 and with glyoxylates, forming fused structures of type 5 and disaccharide-like compounds 7 with good to excellent selectivity.
Almeida, I. G., Alves, M. José, Fortes, A. Gil, Freitas, A. P.   +3 more
core   +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

Synthesis of Z-Protected Aib- and Phe(2Me)-Containing Pentapeptides and Their Crystal Structures [PDF]

, 2014
A series of pentapeptide derivatives containing alpha,alpha-disubstituted alpha-amino acids have been prepared by a combination of the 'azirine/oxazolone method' and segment condensations.
Arnhold, Franziska S, Heimgartner, Heinz, Linden, Anthony   +2 more
core   +1 more source

Bildung eines Azacyclols durch transanulare Ringkontraktion

CHIMIA, 1988
Reaction of 3-dimethylamino-2,2-dimethyl-2H-azirine (1) with phthalimide (8) in polar solvents yields the (1:1)-adduct 2-dimethylamino-9b-hydroxy-3,3-dimethyl-5,9b-dihydro-3H-imidazo[2,1-a]isoindol-5-one (10).
Marlise Schläpfer-Dähler, Roland Prewo, Jost H. Bieri, Gabriel Germain, Heinz Heimgartner   +4 more
doaj   +1 more source

Anti-Inflammatory Dysidazirine Carboxylic Acid from the Marine Cyanobacterium Caldora sp. Collected from the Reefs of Fort Lauderdale, Florida

Molecules, 2022
Dysidazirine carboxylic acid (1) was isolated from the lipophilic extract of a collection of the benthic marine cyanobacterium Caldora sp. from reefs near Fort Lauderdale, Florida. The planar structure of this new compound was determined by spectroscopic
Sarath P. Gunasekera, Sofia Kokkaliari, Ranjala Ratnayake, Thomas Sauvage, Larissa A. H. dos Santos, Hendrik Luesch, Valerie J. Paul   +6 more
doaj   +1 more source

2-Methylsulfanylbenzo[f]isoquinoline [PDF]

, 2015
S-Methylation of a 4-(naphth-2-yl)-β-thiolactam gives an intermediate 4-(naphth-2-yl) substituted 1-azetine which undergoes a [2+2] ring-opening followed by electrocyclic ring closure of the resulting 2-azadiene to give a benzo[f ...
Hemming, Karl, Jamshaid, Faisal, Khan, Musharraf   +2 more
core   +2 more sources