Results 21 to 30 of about 1,101 (192)

Substituent Effects Govern the Efficiency of Isoxazole Photoisomerization to Carbonyl‑2H‑Azirines [PDF]

ACS Organic & Inorganic Au
Kyra E. Jackson, Isabelle Szeto, Leah M. Seebald, Samuel G. Shepard   +3 more
doaj   +2 more sources

Selective Synthesis of 3‑(1H‑Tetrazol-5-yl)-indoles from 2H‑Azirines and Arynes [PDF]

ACS Omega
Carla Grosso, Cláudia Alves, Terver J. Sase, Nuno G. Alves, Ana L. Cardoso, Américo Lemos, Teresa M. V. D. Pinho e Melo   +6 more
doaj   +2 more sources

Synthesis of Δ1‑Pyrrolines via Formal (3 + 2)-Cycloaddition of 2H‑Azirines with Enones Promoted by Visible Light under Continuous Flow [PDF]

ACS Omega
Lorena S. R. Martelli, Lucas G. Furniel, Pedro H. O. Santiago, Javier Ellena, Arlene G. Corrêa   +4 more
doaj   +2 more sources

Fragmentation of Carbohydrate Anomeric Alkoxyl Radicals. A New Synthesis of Chiral β-Iodo Azides, Vinyl Azides, and 2H-Azirines

, 2016
The reaction of 3-azido-2,3-dideoxy-hexopyranose compounds from the d-gluco, d-galacto, d-lacto, and l-arabino carbohydrate series, with (diacetoxyiodo)benzene and iodine, generated 2-azido-1,2-dideoxy-1-iodo-alditols with one carbon less than the ...
María S. Rodríguez (3030198), Alan R. Kennedy (1266753), Carmen R. Alonso-Cruz (2435974), Ernesto Suárez (2440549)   +3 more
core   +2 more sources

Reactivity of 2-Halo-2H-azirines. 1. Reactions with Nucleophiles [PDF]

, 2002
Nucleophilic substitution reactions of 2-halo-2H-azirines 1a, 1b, 1d, and 1e with potassium phthalimide and aniline allowed the preparation of new substituted 2H-azirines 2−5.
Veiga, Luiz Alte da, Melo, Teresa M. V. D. Pinho e, Lopes, Cláudia S. J., Beja, Ana M., Gonsalves, António M. d'A. Rocha, Silva, Manuela R., Paixão, José A.   +6 more
core   +1 more source

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
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

Electrocyclizations of Conjugated Azapolyenes Produced in Reactions of Azaheterocycles with Metal Carbenes

Organics, 2021
Conjugated azapolyenes (azabuta-1,3-dienes, aza-/diaza-/oxaza-/oxadiazahexa-1,3,5-trienes) are highly reactive in electrocyclization reactions, which makes them convenient precursors for the synthesis of a wide range of four-, five-, and six-membered ...
Nikolai V. Rostovskii, Mikhail S. Novikov, Alexander F. Khlebnikov   +2 more
doaj   +1 more source

Azirinium ylides from α-diazoketones and 2H-azirines on the route to 2H-1,4-oxazines: three-membered ring opening vs 1,5-cyclization

Beilstein Journal of Organic Chemistry, 2015
Strained azirinium ylides derived from 2H-azirines and α-diazoketones under Rh(II)-catalysis can undergo either irreversible ring opening across the N–C2 bond to 2-azabuta-1,3-dienes that further cyclize to 2H-1,4-oxazines or reversibly undergo a 1,5 ...
Nikolai V. Rostovskii, Mikhail S. Novikov, Alexander F. Khlebnikov, Galina L. Starova, Margarita S. Avdontseva   +4 more
doaj   +1 more source