Results 111 to 120 of about 17,890 (211)

Reaction of Nitrilimines with Pyruvaldehyde Hydrazones: Synthesis and Antimicrobial Evaluation of Some New 1,2,4-Triazole Derivatives

Journal of Chemistry, 2015
A new series of 1,3,4,5,5-pentasubstituted-1,2,4-triazoles (4a–j, 6a–j) have been synthesized by the 1,3-dipolar cycloaddition of suitable nitrilimines 2 to pyruvaldehyde (2-oxopropanal) hydrazones having (COPh, COOMe, COOEt, Me/Me, and Me/Ph) groups 3 ...
Hany M. Dalloul
doaj   +1 more source

REACTIVITY OF N-SUBSTITUTED p-BENZO AND p-NAPHTHOQUINONEIMINE N-OXIDES TOWARD DIPOLAROPHILES [PDF]

Journal of Sciences, Islamic Republic of Iran, 1990
The dipolar cycloaddition reactivity of N-(1-naphthy1)-1,4- benzoquinoneimine N-oxide and N-phenyl-1,4- naphthoquinoneimine Noxide are investigated, The latter gives the expected adducts with common dipolarophiles such as acrylonitryle, methyl ...
doaj  

Convenient Synthesis and Biological Evaluation of Modafinil Derivatives: Benzhydrylsulfanyl and Benzhydrylsulfinyl [1,2,3]triazol-4-yl-methyl Esters

Molecules, 2011
Simple synthesis and biological activities of modafinil derivatives are described. The key reactions include condensation of acid and propargyl alcohol, subsequent 1,3-dipolar cycloaddition reaction of alkynes and (3-azido-propyl)cyclohexane or (4-azido ...
Seikwan Oh, Mankil Jung, Eunyoung Lim, Jee-Young Son, Yeonju Lee, Jae-Chul Jung   +5 more
doaj   +1 more source

Recent advances in the synthesis of triazole derivatives [PDF]

, 2015
Triazole ring system has attracted a continuously growing interest of synthetic organic chemists and those dealing with the medicinal compounds due to its versatile potential to interact with biological systems.
Ahmad, Matloob, Aslam, Sana, Jawwad, Muhammad, Khan, Imran Ahmad, Mansha, Asim, Raza Naqvi, Syed Ali, Zahoor, Fawad   +6 more
core  

1, 3-Dipolar Cycloaddition of Diazomethane with Carbon-Carbon Unsaturated Systems Involving Nitrofuran Ring

Journal of Synthetic Organic Chemistry, Japan, 1968
1, 3-Dipolar cycloaddition reaction of diazomethane with 5-nitro-2-furylacrylic acid gave 4- (5'-nitro-2'-furyl) -3-carbomethoxypyrazoline (3), mp 184485°C, in 80% yield. A similar reaction with 5-nitro-2-furylpropiolic acid afforded the corresponding isomeric mixture of the 2-pyrazole derivatives in 25% yield. (1) was refluxed in toluene to afford 2- (
Tadashi SASAKI, Katsuhiko SHOJI
openaire   +2 more sources

Synthesis of some isoxazoline, isoxazole and pyrazole carboxylic acids as the precursors of new 1,2-diacyl-1-alkylhydrazines [PDF]

, 2013
A number of isoxazoline, isoxazole and pyrazole carboxylic acids or their esters has been synthesized via the 1,3-dipolar cycloaddition of corresponding nitrile oxides or diazomethane to unsaturated dipolarophiles.
Antonevich, I. P., Katok, Ya. M.
core  

Microwave assisted one pot 1 ,3-dipolar cycloaddition reactions of novel dihydropyran derived nitrone

, 2012
Organic Chemistry Labor~ tory, Sikkim Government College, Gangtok-737 102, Sikkim, India E-mail : bchakraborty42@gmail.com Manuscript received 20 April 2011, revised 19 September. 2011, accepted 17 October 2011 Microwave assisted 1,3-dipolar cycloaddition reactions of novel dihydropyran derived nitrone with various dipolarophiles have been studied in ...
Chakraborty, Bhaskar, Prawin Kumar Sharma   +1 more
openaire   +1 more source

Regioselective Synthesis of Some Pyrazole Scaffolds Attached to Benzothiazole and Benzimidazole Moieties

Journal of Chemistry, 2014
Condensation of 2-(benzothiazol-2-yl)acetonitrile (1) or 2-(1-methyl-1H-benzimidazol-2-yl)acetonitrile (2) with thiophene-2-carbaldehyde afforded the corresponding acrylonitrile derivatives 3 or 4, respectively.
Nabila A. Kheder, Yahia N. Mabkhot, Fawzia R. Zahian, Sara S. Mohamed   +3 more
doaj   +1 more source

Theory of Distinct Crystal Structures of Polymerized Fullerides AC60, A=K, Rb, Cs: the Specific Role of Alkalis

, 2000
The polymer phases of AC60 form distinct crystal structures characterized by the mutual orientations of the (C60-)n chains. We show that the direct electric quadrupole interaction between chains always favors the orthorhombic structure Pmnn with ...
A. Hüller, A. Hüller, A. M. Rao, A. V. Nikolaev, A. V. Nikolaev, F. Bommeli, H. Alloul, H. Kuzmany, J. Winter, K. F. Niebel, K. H. Michel, L. D. Landau, M. S. Dresselhaus, N. Parsonage, N. W. Ashcroft, O. Chauvet, P. Launois, P. Launois, P. Moret, P. W. Stephens, Q. Zhu, R. A. Cowley, R. M. Lynden-Bell, R. Migoni, S. C. Erwin, S. Pekker, S. Rouzière, T. M. de Swiet   +27 more
core   +1 more source

Design, Synthesis, enzyme inhibitory activity and molecular docking studies of new 1,2,3-triazole linked nucleobases

Results in Chemistry
Thirteen novel 1,2,3-triazole linked nucleobases (5a-m) were designed and efficiently synthesized as potential human enzyme inhibitors. The target compounds were synthesized by using Copper (I)-catalysed Huisgen-Sharpless-Meldal 1,3-dipolar cycloaddition
Aditya Aggarwal, Chanchal Vashisth, Komal Bharti, Neera Raghav, Surender Kumar   +4 more
doaj   +1 more source