Results 21 to 30 of about 9,761,251 (311)

A Simple Zinc-Mediated Method for Selenium Addition to Michael Acceptors

Molecules, 2020
In this work, we focused our attention on seleno-Michael type reactions. These were performed using zinc-selenolates generated in situ from diphenyl diselenide 1, 1,2-bis(3-phenylpropyl)diselenide 30, and protected selenocystine 31 via an efficient ...
Francesca Giulia Nacca, Bonifacio Monti, Eder João Lenardão, Paul Evans, Claudio Santi   +4 more
doaj   +1 more source

Enantioselective Organocatalyzed Michael Addition of Isobutyraldehyde to Maleimides in Aqueous Media

Molecules, 2022
Thiourea was introduced into (R,R)-1,2-diphenylethylenediamine as an organocatalyst to promote the reaction between isobutyraldehydes and maleimides. Enantioselective Michael addition reaction was carried out as an eco-friendly method using water as the ...
Jae Ho Shim, Seok Hyun Cheun, Hyeon Soo Kim, Deok-Chan Ha   +3 more
doaj   +1 more source

Symmetrical molecules from reaction of beta-cyclohexanediones with acetylenedicarboxylic acid in aqueous medium

Orbital: The Electronic Journal of Chemistry, 2012
In an attempt to obtain Michael adducts in aqueous medium, 1,3-cyclohexanedione (1) or dimedone (2) and acetylenedicarboxylic acid monopotassium (3) were dissolved in water and heated to reflux. Under these conditions, two products were isolated
Leonardo Ribeiro Martins, Adilson Beatriz, Dênis Pires de Lima   +2 more
doaj   +1 more source

Regioselective 1,4-trifluoromethylation of α,β-unsaturated ketones via a S-(trifluoromethyl)diphenylsulfonium salts/copper system

Beilstein Journal of Organic Chemistry, 2013
Regioselective conjugate 1,4-trifluoromethylation of α,β-unsaturated ketones by the use of shelf-stable electrophilic trifluoromethylating reagents, S-(trifluoromethyl)diphenylsulfonium salts and copper under mild conditions is described. A wide range of
Satoshi Okusu, Yutaka Sugita, Etsuko Tokunaga, Norio Shibata   +3 more
doaj   +1 more source

Elimination Reaction-Based Benzimidazole Probe for Cysteine Detection and Its Application in Serum Sample Analysis

Biosensors, 2022
Benzimidazole-based compound 2-(p-tolyl)-1H-benzo[d]imidazole (3) and its derivative probe A-B have been synthesized for the highly selective detection and quantification of Cys in human serum.
In-ho Song, Gyu Seong Yeom, Anil Kuwar, Satish Balasaheb Nimse   +3 more
doaj   +1 more source

Recent Advances in Asymmetric Organocatalyzed Conjugate Additions to Nitroalkenes

Molecules, 2017
The asymmetric conjugate addition of carbon and heteroatom nucleophiles to nitroalkenes is a very interesting tool for the construction of highly functionalized synthetic building blocks.
Diego A. Alonso, Alejandro Baeza, Rafael Chinchilla, Cecilia Gómez, Gabriela Guillena, Isidro M. Pastor, Diego J. Ramón   +6 more
doaj   +1 more source

Asymmetric Conjugate Addition of α,α-Disubstituted Aldehydes to Nitroalkenes Organocatalyzed by Chiral Monosalicylamides from trans-Cyclohexane-1,2-Diamines

Molecules, 2018
Primary amine-salicylamides derived from chiral trans-cyclohexane-1,2-diamines are used as organocatalysts for the enantioselective conjugate addition of α,α-disubstituted aldehydes to arylated and heteroarylated nitroalkenes.
José R. Martínez-Guillén, Jesús Flores-Ferrándiz, Cecilia Gómez, Enrique Gómez-Bengoa, Rafael Chinchilla   +4 more
doaj   +1 more source

The applicability of sulfoxide Michael acceptor – 2­-(S)-­[(4­-methylphenyl)sulfinyl]-­2­-cyclopenten­-1­-one in constructing the carbon skeleton of 9,11­-secosterols [PDF]

Proceedings of the Estonian Academy of Sciences
A possibility of use of the Michael addition reaction of the A,B­-ring fragment enolate to sulfoxide 2­-(S)-­[(4­-methylphenyl)sulfinyl]-­2­-cyclopenten­-1­-one for constructing the main skeleton of 9,11­-secosterols was studied.
Kristi Rõuk, Marek Kõllo, Ivar Järving, Margus Lopp   +3 more
doaj   +1 more source

Microwave assisted synthesis of some new coumarin-pyrazoline hybrids and their antimicrobial activity [PDF]

Journal of the Serbian Chemical Society, 2015
A series of pyrazolines 4a-g have been synthesized by Michael addition of chalcones 3a-g with hydrazine hydrate in presence of sodium acetate under conventional heating and microwave irradiation.
Ashok Dongamanti, Lakshmi Bommidi Vijaya, Ravi Sidda, Ganesh Arram   +3 more
doaj   +1 more source

4′-(N-(2-Cyanoethyl)pyrrol-2-yl)-2,2′:6′,2″-terpyridine

Molbank, 2023
The preparation and characterization of a new multi-functionalized terpyridine molecule featuring a pyrrole heterocycle and a cyano group is described. This new compound was obtained via a KF/alumina-catalyzed Michael addition of 4′-(pyrrol-2-yl)-2,2′:6′,
Jérôme Husson
doaj   +1 more source