Results 1 to 10 of about 25,619 (230)

Nitropyridines as 2π-Partners in 1,3-Dipolar Cycloadditions with N-Methyl Azomethine Ylide: An Easy Access to Condensed Pyrrolines

Molecules, 2021
1,3-Dipolar cycloaddition reactions of 2-substituted 5-R-3-nitropyridines and isomeric 3-R-5-nitropyridines with N-methyl azomethine ylide were studied. The effect of the substituent at positions 2 and 5 of the pyridine ring on the possibility of the [3 ...
Maxim A. Bastrakov, Alexey K. Fedorenko, Alexey M. Starosotnikov, Alexander Kh. Shakhnes   +3 more
doaj   +1 more source

New Cycloadditon Reaction of 2-Chloroprop-2-enethioamides with Dialkyl Acetylenedicarboxylates: Synthesis of Dialkyl 2-[4,5-bis(alkoxycarbonyl)-2-(aryl{alkyl}imino)-3(2H)-thienylidene]-1,3-dithiole-4,5-dicarboxylates

Molecules, 2022
The 1,3-dipolar cycloaddition of 1,2-dithiole-3-thiones with alkynes to form 1,3-dithioles is one of the most studied reactions in this class of polysulfur-containing heterocycles. Nucleophilic substitution of chlorine atoms in dimethyl 2-(1,2-dichloro-2-
Vladimir A. Ogurtsov, Oleg A. Rakitin
doaj   +1 more source

Fluorescent Azasteroids through Ultrasound Assisted Cycloaddition Reactions

Molecules, 2021
We report here the synthesis and optical spectral properties of several new azasteroid derivatives. The formation of these compounds was explained based on the most probable mechanism.
Costel Moldoveanu, Ionel Mangalagiu, Gheorghita Zbancioc   +2 more
doaj   +1 more source

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

Synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexane via cyclopropene cycloadditions to the stable azomethine ylide derived from Ruhemann's purple

Beilstein Journal of Organic Chemistry, 2022
A reliable method for the synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexanes through the 1,3-dipolar cycloaddition (1,3-DC) reactions of cyclopropenes to the stable azomethine ylide – protonated form of Ruhemann's purple (PRP) has ...
Alexander S. Filatov, Olesya V. Khoroshilova, Anna G. Larina, Vitali M. Boitsov, Alexander V. Stepakov   +4 more
doaj   +1 more source

3-Benzoylisoxazolines by 1,3-Dipolar Cycloaddition: Chloramine-T-Catalyzed Condensation of α-Nitroketones with Dipolarophiles

Molecules, 2021
In this study, 3-benzoylisoxazolines were synthesized by reacting alkenes with various α-nitroketones using chloramine-T as the base. The scope of α-nitroketones and alkenes is extensive, including different alkenes and alkynes to form various ...
Xinhui Pan, Xiaobing Xin, Ying Mao, Xin Li, Yanan Zhao, Yidi Liu, Ke Zhang, Xiaoda Yang, Jinhui Wang   +8 more
doaj   +1 more source

Highly Efficient Construction of Sugar-Fused Spirochromanono Pyrrolidines/Pyrrolizidines/Thiolizidines via 1,3-Dipolar Cycloaddition of Azomethine Ylides

SynOpen, 2017
A variety of sugar-fused chromanono pyrrolidines/pyrrolizidines/thiolizidines have been synthesized by intermolecular 1,3-dipolar cycloaddition reaction of azomethine ylides (generated from glucose aldehyde and different secondary amino acids) with ...
Sirisha Nallamala, Srikumar Mannem, Raghunathan Raghavachary   +2 more
doaj   +1 more source

Theoretical analysis of the mechanism and regioselectivity of the 1, 3-dipolar cycloaddition of E-3-(dimethylamino)-1-(10H-phenothiazin-2-yl)prop-2-en-1-one with some nitrilimines using DFT and the distortion/interaction model

Acta Chimica Slovenica, 2015
The regiochemistry of 1,3-dipolar cycloaddition reactions of E-3-(dimethylamino)-1-(10H-phenothiazin-2-yl) prop-2-en-1-one with some nitrilimines were investigated using density functional theory (DFT) -based reactivity indexes, activation energy ...
Farid Moeinpour, Amir Khojastehnezhad
doaj   +1 more source

Synthesis of New N-phenyl Fulleroisoxazoline in the Presence of Fe3O4@SiO2 Nanoparticles as an Efficient Magnetically Recoverable and Reusable Catalyst [PDF]

Journal of Nanostructures, 2014
In this research an effective and appropriate method has been developed for one-pot synthesis of new N-phenyl fulleroisoxazoline using Fe3O4@SiO2 nanoparticles as a green magnetically recyclable catalyst. The prepared catalytic samples were characterized
J. Safaei-Ghomi, R. Masoomi
doaj   +1 more source

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