Results 21 to 30 of about 1,059 (165)

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

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

Reactivity of 2-halo-2H-azirines. Part 3: Dehalogenation of 2-halo-2H-azirine-2-carboxylates [PDF]

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

Non-Decarboxylative Ruthenium-Catalyzed Rearrangement of 4-Alkylidene-isoxazol-5-ones to Pyrazole- and Isoxazole-4-carboxylic Acids [PDF]

, 2022
Treatment of 4-(2-hydroaminoalkylidenyl)- and 4-(2-hydroxyalkylidenyl)-substituted isoxazol-5(4H)-ones with catalytic amounts of [RuCl2(p-cymene)]2, without any additive, afforded pyrazole- and isoxazole-4-carboxylic acids, respectively.
Beccalli E. M., Broggini G., Foschi F., Lo Presti L., Loro C., Molteni L., Papis M.   +6 more
core   +4 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

Synthesis and Reactions of a 2H-Azirine Unsubstituted on C–3 [PDF]

, 2022
Thermolysis [¹] or photolysis [²] of 1-alkyl or 1-aryl-vinyl azides (1) (R¹ = R² = H, aryl, alkyl; R³= aryl, alkyl)[³] leads to the formation of 2H-azirines with a substituent at C-3 (2) and to ketenimines (3). However, the decomposition of “terminal”
Bauer, W., Hafner, Klaus
core   +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

Synthesis of 2-(Trifluoromethyl)Azetidines by Strain-Release Reactions of 2-(Trifluoromethyl)-1-Azabicyclo[1.1.0]Butanes. [PDF]

Chemistry
2‐(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, Dupas A, Lefebvre G, Bouriche N, Chédotal H, Guillamot G, Cossy J, Meyer C.   +7 more
europepmc   +2 more sources

Synthetic Strategies to Access Fluorinated Azoles. [PDF]

European J Org Chem
This 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, Djugovski M, Huang TY, Adhikari S, Roy S.   +4 more
europepmc   +2 more sources

Acremolin, a stable natural product with an antiaromatic 1H-azirine moiety? A structural reorientation [PDF]

, 2012
Recently, acremolin (4), a novel modified base, was isolated from a marine-derived fungus and claimed to possess a structure with a 1H-azirine moiety. It is shown now that the reported NMR data are not compatible with this antiaromatic heterocycle, which
Klaus Banert, Backes, Nair, Pearson, Palacios, Gilchrist, Rai, Fowler, Wentrup, Miller, Molinski, Salomon, Stapley, Davis, Davis, Regitz, Jacox, Kodama, Maier, Fowler, Anderson, Gilchrist, Anderson, Gilchrist, Atkinson, Gilchrist, Mitchell, Mitchell, Huisgen, Meinwald, Gilchrist, Gilchrist, Wentrup, Thétaz, Wentrup, Clark, Hopkinson, Bock, Alcami, Lathan, Mó, Byun, Malar, Budzelaar, Alcami, Würthwein, Mó, Čársky, Julianti, Günther, Balci, Hesse, Fedtke, Guengerich, Kuśmierek, Lee, Sattsangi, Still, Pretsch, Kalinowski, Isomura, Guillemin   +61 more
core   +5 more sources