Results 71 to 80 of about 3,120 (207)

Pyridonderivate aus 3-Amino-2H-azirinen und Cyclopropenonen

CHIMIA, 1978
Reaction of the 3-dimethylamino-2H-azirines 1a and 1b with diphenylcyclopropenone (2a) in ether or acetonitrile leads to the 2-dimethylamino-5,6-diphenyl-4(3H)-pyridones 3a and 3b in 70 and 80% yield, respectively. The structure of these 1:1-adducts has
Stanislav Chaloupka, Heinz Heimgartner
doaj   +1 more source

Novel aziridine esters by the addition of aromatic nitrogen heterocycles to a 2H-azirine-3-carboxylic ester [PDF]

, 2000
Methyl 2-(2,6-dichlorophenyl)-2H-azirine-3-carboxoylate acts as an efficient alkylating agent for a variety of five-membered aromatic heterocycles. The aziridines derived from heterocycles that bear an alpha-carbonyl substituent react with TFA to give ...
Alves, Maria José Chão, Ferreira, Paula M. T., Gilchrist, T. L., Maia, Hernâni Lopes Silva, Monteiro, Luís S.   +4 more
core   +1 more source

Synthesis of α-Aminophosphonic Acid Derivatives Through the Addition of O- and S-Nucleophiles to 2H-Azirines and Their Antiproliferative Effect on A549 Human Lung Adenocarcinoma Cells

Molecules, 2020
This work reports a straightforward regioselective synthetic methodology to prepare α-aminophosphine oxides and phosphonates through the addition of oxygen and sulfur nucleophiles to the C–N double bond of 2H-azirine derivatives. Determined by the nature
Victor Carramiñana, Ana M. Ochoa de Retana, Francisco Palacios, Jesús M. de los Santos   +3 more
doaj   +1 more source

Von Sauerstoff zu Tellur: Der Einfluss des Chalkogenatoms auf die Nucleophilie und Basizität von Isochalkogenharnstoff‐basierten Katalysatoren

Angewandte Chemie, Volume 137, Issue 48, November 24, 2025.
Der Einbau verschiedener Chalkogenatome (O, S, Se oder Te) in häufig verwendete Isochalkogenharnstoff‐Organokatalysatoren ermöglicht die Feinabstimmung ihrer Nucleophilie und Basizität. Kinetische und thermodynamische Deskriptoren für die molekularen Eigenschaften der Katalysatoren werden als Werkzeuge zur Vorhersage ihrer Effizienz eingeführt und in ...
Lotte Stockhammer, Kevin Kasten, Andreas Eitzinger, Lukas S. Vogl, Magdalena Piringer, David Weinzierl, Armin R. Ofial, Andrew D. Smith, Mario Waser   +8 more
wiley   +1 more source

Síntese e reactividade de 2H - Azirinas [PDF]

, 2007
Tese de Doutoramento em Ciências (Área de Especialização em Química Orgânica)O trabalho teve como objectivo primeiro, sintetizar 2H-azirinas com o grupo sulfinilo na posição 3.
Sousa, João Henriques de
core  

Insertion of Nitriles Into a Gold(III)/Carbene Bond: A Direct and Powerful Entry to Imino‐Substituted Carbenes

Angewandte Chemie, Volume 137, Issue 23, June 2, 2025.
Stable imino‐substituted Au(III) carbenes are easily and efficiently prepared by trapping the transient (N^C^C)Au←:CH(dmp)+ carbene with nitriles. The corresponding free species are readily generated and display dual carbene / nitrile‐ylide reactivities. The diazo decomposition, nitrile insertion, and carbene transfer can be combined in three‐component
Rui Wei, Nina Albouy, Sonia Mallet‐Ladeira, Karinne Miqueu, Didier Bourissou   +4 more
wiley   +2 more sources

Structure, spectroscopic signatures, and formation of hydroxy-azirine: a potential interstellar prebiotic molecule [PDF]

, 2023
Pilar Redondo, Miguel Sanz‐Novo, Carmen Barrientos, Antonio Largo   +3 more
openalex   +1 more source

From Oxygen to Tellurium: The Impact of the Chalcogen on Nucleophilicities and Basicities of Isochalcogenourea Catalysts

Angewandte Chemie International Edition, Volume 64, Issue 48, November 24, 2025.
Incorporation of different chalcogen atoms allows for the fine‐tuning of nucleophilicity and basicity of commonly used isochalcogenourea organocatalyst scaffolds. Kinetic and thermodynamic descriptors for the molecular properties of the catalysts are introduced as tools to predict their efficiency and tested in acyl transfer and allenoate activation ...
Lotte Stockhammer, Kevin Kasten, Andreas Eitzinger, Lukas S. Vogl, Magdalena Piringer, David Weinzierl, Armin R. Ofial, Andrew D. Smith, Mario Waser   +8 more
wiley   +1 more source

Intermolecular alkyl radical addition to methyl 2-(2,6-Dichlorophenyl)-2H-azirine-3-carboxylate [PDF]

, 2012
The 2H-azirine 1 acts as an effective radical acceptor for secondary and tertiary alkyl iodides mediated by triethylborane.
Alves, Maria José Chão, Fortes, Gil, Guimaraes, Emanuel, Lemos, A.   +3 more
core  

Organocatalysts for the Asymmetric Neber reaction: Synthesis of Chiral 2‐(Tetrazol‐5‐yl)‐2 H ‐Azirines [PDF]

, 2023
Cláudia Alves, Terver John Sase, Cristina Gadelho, Dina Murtinho, M. Elisa Silva Serra, Ana L. Cardoso, Teresa M. V. D. Pinho e Melo   +6 more
openalex   +1 more source