Results 21 to 30 of about 79,082 (160)

2H-Azirines as dipolarophiles [PDF]

Tetrahedron Letters, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Melo, Teresa M. V. D. Pinho e, Cardoso, Ana L., Gomes, Clara S. B., Gonsalves, António M. d'A. Rocha   +3 more
openaire   +2 more sources

Organo-photocatalytic Synthesis of Functionalized Pyrroles from 2H-Azirines and α-Substituted Nitroalkenes

SynOpen, 2022
An efficient organo-photocatalytic method for the synthesis of tetrasubstituted pyrroles bearing a ketone, ester, alcohol, or nitro group at the 3-position has been developed.
Lalita Devi, Poornima Mishra, Ayushi Pokhriyal, Namrata Rastogi   +3 more
doaj   +1 more source

A Chemical Framework for Engineering Extracellular Vesicles' Biointerface to Advance Precision Therapeutics. [PDF]

Adv Mater
Extracellular vesicles (EVs) are cell‐derived nanoparticles that mediate intercellular communication through their dynamic biointerfaces. Owing to their intrinsic biological functions, EVs have emerged as promising platforms for biomedical applications.
Pourtalebi Jahromi L, Geng F, Frenzke JN, Fuhrmann G.   +3 more
europepmc   +2 more sources

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

Late-Stage Functionalization of Peptides on the Solid Phase. [PDF]

Angew Chem Int Ed Engl
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.
Werner M, Pham TL, Thomas F.
europepmc   +2 more sources

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

, 2001
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., José A. Paixão, Teresa M. V. D. Pinho e Melo, Luiz Alte da Veiga, Cláudia S. J. Lopes, Ana M. Beja, null António M. d'A. Rocha Gonsalves,, Manuela R. Silva   +13 more
core   +1 more source

[3 + 2]-Cycloadditions of nitrile ylides after photoactivation of vinyl azides under flow conditions

Beilstein Journal of Organic Chemistry, 2013
The photodenitrogenation of vinyl azides to 2H-azirines by using a photoflow reactor is reported and compared with thermal formation of 2H-azirines. Photochemically, the ring of the 2H-azirines was opened to yield the nitrile ylides, which underwent a [3
Stephan Cludius-Brandt, Lukas Kupracz, Andreas Kirschning   +2 more
doaj   +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

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
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