Results 21 to 30 of about 99,145 (214)

SYNTHESIS OF SOME 2,7-DIAZABICYCLO {4.l.0} HEPT-3-ENE DERIVATIVES WITH ANALGESIC AND ANTICOCCIDIAL ACTIVITY [PDF]

Bulletin of Pharmaceutical Sciences. Assiut University, 1986
The 1,3-dipolar cycloaddition reaction of arylsulphonyl azides to 1,3-disubstituted-1,4-dihydropyridines afforded 2,7-diazabieyclo {4.1.0} hept-3-ene derivatives (III).These compounds exhibited more significant analgesic and anticoccidial activities than
A. El-Badr, R. Abdel-Aal, H. Hemaiat-Allah, H. Hassan, A. Abdel-Alim, H. Farag   +5 more
doaj   +1 more source

Kinetic Resolution of Alkylidene Norcamphors via a Ligand-Controlled Umpolung-Type 1,3-Dipolar Cycloaddition

iScience, 2019
Summary: Development of a general catalytic and highly efficient method utilizing readily available precursors for the regio- and stereoselective construction of bioactive natural-product-inspired spiro architectures remains a formidable challenge in ...
Chong Shen, Yuhong Yang, Liang Wei, Wu-Wei Dong, Lung Wa Chung, Chun-Jiang Wang   +5 more
doaj   +1 more source

N-Alkylated dinitrones from isosorbide as cross-linkers for unsaturated bio-based polyesters

Beilstein Journal of Organic Chemistry, 2014
Isosorbide was esterified with acryloyl chloride and crotonic acid yielding isosorbide diacrylate (9a) and isosorbide dicrotonate (9b), which were reacted with benzaldehyde oxime in the presence of zinc(II) iodide and boron triflouride etherate as ...
Oliver Goerz, Helmut Ritter
doaj   +1 more source

1,3-Dipolar Cycloadditions to Bicyclic Olefins. I. 1,3-Dipolar Cycloadditions to Norbornadienes [PDF]

Bulletin of the Chemical Society of Japan, 1977
Abstract The 1,3-dipolar cycloadditions of phenylglyoxylonitrile oxide, benzonitrile-N-phenylimine, or N-phenyl-C-p-nitrophenylnitrone to norbornadiene, 2,3-dicyanonorbornadiene, and 2,3-bis(methoxycarbonyl)norbornadiene give the endo-adducts, together with the exo-adducts.
Hisaji Taniguchi, Toshikazu Ikeda, Yoshihiro Yoshida, Eiji Imoto   +3 more
openaire   +1 more source

Dimerization of propargyl and homopropargyl 6-azido-6-deoxy-glycosides upon 1,3-dipolar cycloaddition

Beilstein Journal of Organic Chemistry, 2008
Copper-catalyzed, thermal or microwave promoted 1,3-dipolar cycloaddition (Click Reaction) of 2-propynyl and 3-butynyl 2,3,4-tri-O-acetyl-6-azido-6-deoxy-glycopyranosides in the D-gluco, D-galacto and D-manno series afford the corresponding dimeric ...
Nikolas Pietrzik, Daniel Schmollinger, Thomas Ziegler   +2 more
doaj   +1 more source

A Suitable Functionalization of Nitroindazoles with Triazolyl and Pyrazolyl Moieties via Cycloaddition Reactions

Molecules, 2019
The alkylation of a series of nitroindazole derivatives with 1,2-dibromoethane afforded the corresponding N-(2-bromoethyl)- and N-vinyl-nitro-1H-indazoles.
Mohammed Eddahmi, Nuno M. M. Moura, Latifa Bouissane, Ouafa Amiri, M. Amparo F. Faustino, José A. S. Cavaleiro, Ricardo F. Mendes, Filipe A. A. Paz, Maria G. P. M. S. Neves, El Mostapha Rakib   +9 more
doaj   +1 more source

On the strong difference in reactivity of acyclic and cyclic diazodiketones with thioketones: experimental results and quantum-chemical interpretation

Beilstein Journal of Organic Chemistry, 2015
The 1,3-dipolar cycloaddition of acyclic 2-diazo-1,3-dicarbonyl compounds (DDC) and thioketones preferably occurs with Z,E-conformers and leads to the formation of transient thiocarbonyl ylides in two stages.
Andrey S. Mereshchenko, Alexey V. Ivanov, Viktor I. Baranovskii, Grzegorz Mloston, Ludmila L. Rodina, Valerij A. Nikolaev   +5 more
doaj   +1 more source

Synthesis of Heterocylic Compounds of Biological Interest from Carbohydrate Derivatives

Molecules, 2000
The synthesis of some isoxazolic compounds from carbohydrate derivatives is described. These products are obtained by 1,3-dipolar cycloaddition reaction and their functionalization leads to derivatives with potential biological activities.
M. F. Martinez Esperón, M. L. Fascio, N. B. D’Accorso   +2 more
doaj   +1 more source

Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3-b]indolizines from Alkylpyridinium Salts and Enaminones

Molecules, 2020
Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and ...
Ekaterina A. Sokolova, Alexey A. Festa, Karthikeyan Subramani, Victor B. Rybakov, Alexey V. Varlamov, Leonid G. Voskressensky, Erik V. Van der Eycken   +6 more
doaj   +1 more source

Synthesis of Novel Spiro-Isoxazolidine Derivatives of 9α-Hydroxyparthenolide

Molbank
The 1,3-dipolar cycloaddition reaction was applied to 9α-hydroxyparthenolide, an important sesquiterpene component of Anvillea radiata that was extracted directly from plant material collected in Morocco.
Mohamed Zaki, Mohammed Loubidi, Sabine Berteina-Raboin   +2 more
doaj   +1 more source