Results 191 to 200 of about 17,890 (211)

1, 3-Dipolar cycloaddition between ethyl trifluoroacetoacetate and N-(benzylidene)methylamine N-oxide

J. Chem. Soc., Perkin Trans. 1, 1991
The 1,3-dipolar cycloaddition between ethyl trifluoroacetoacetate and N-(benzylidene)methylamine Noxide, performed in boiling toluene, leads regio- and stereo-selectively to an isoxazolidine, while the corresponding ethyl acetoacetate is found to be unreactive under the same conditions.
Jean-Pierre Bégué, Danièle Bonnet-Delpon, Thierry Lequeux   +2 more
openaire   +1 more source

1, 3-Dipolar Cycloadditions to Polycyclic Aromatic Hydrocarbons

2002
The results of a 1, 3-dipolar cycloaddition reaction involving polyaromatic hydrocarbons (PAHs) as the dipolarophiles and the 1, 3-dipole formed by the ring-opening of a 5-oxabicyclo[2.1.0]pentane are reported. PAHs such as naphthalene, anthracene, benzanthracene, acenaphthene, phenanthrene, 9, 10-phenanthroline, gave mixtures of endo- (major) and exo-
Margetić, Davor, Warrener, Ronald N., Butler, Douglas N.   +2 more
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ChemInform Abstract: SYNTH. VON STEROIDDERIVATEN VON 1,2,4‐OXADIAZOLEN DURCH 1‐3‐DIPOLARE CYCLOADDITION

Chemischer Informationsdienst, 1972
AbstractBei der Umsetzung des Androstenderivats (I) mit Benzohydroximoylchlorid (II) in Gegenwart von Triäthylamin in THF entsteht das Produkt (III).
G. FERRARA, A. IUS, C. PARINI, G. SPORTOLETTI, G. VECCHIO   +4 more
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Practical Synthesis of Valbenazine via 1,3‐Dipolar Cycloaddition^†

Chinese Journal of Chemistry, 2023
Comprehensive SummaryValbenazine (Ingrezza), a potent and highly selective inhibitor of vesicular monoamine transporter type 2 (VMAT2) through the active metabolite hydrotetrabenazine (HTBZ), has been approved for the treatment of tardive dyskinesia and, very recently, for chorea, which is associated with Huntington's disease.
Yalan Peng, Zuming Lin, Lili Zhu, Shiqing Han, Sha-Hua Huang, Ran Hong   +5 more
openaire   +1 more source

Synthesis of benzosuberone-tethered spirooxindoles: 1-3-dipolar cycloaddition of azomethine ylides and arylidene benzosuberones

Molecular Diversity, 2018
Expedient synthesis of benzosuberone-tethered spirooxindoles was accomplished by a three-component 1,3-dipolar cycloaddition reaction between azomethine ylide (generated in situ) and arylidene benzosuberone. This protocol offers good yield and wide functional group tolerance under mild reaction condition with high regio- and stereoselectivities.
Sundaravel Vivek, Kumar, Gandhi Uma, Rani, Manohar, Divyalakshmi, Nattamai, Bhuvanesh, Shanmugam, Muthusubramanian, Subbu, Perumal   +5 more
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Synthesis of fluorophosphonylated acyclic nucleotide analogues via copper(I)-catalyzed Huisgen 1-3 dipolar cycloaddition

Organic & Biomolecular Chemistry, 2009
Preparation of several acyclonucleosides containing both a difluoromethylphosphonate group and a triazole moiety is described starting from a difluorophosphonosulfide. The key step of the synthesis involves a copper(I)-catalyzed Huisgen 1-3 dipolar cycloaddition between difluorophosphonylated azides and propargylated nucleobases derived from thymine ...
Sonia Amel, Diab, Antje, Hienzch, Cyril, Lebargy, Stéphane, Guillarme, Emmanuel, Pfund, Thierry, Lequeux   +5 more
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Access to functionalised silver(i) and gold(i) N-heterocyclic carbenes by [2 + 3] dipolar cycloadditions

Dalton Transactions, 2012
A new strategy was developed for the modification of silver(I) and gold(I) N-heterocyclic carbenes. Azido groups were grafted and used either by copper-catalysed azide-alkyne cycloaddition before metallation or by thermal and "strain-promoted" 1,3-dipolar cycloaddition after metallation to functionalise the metal-NHCs.
Hospital, Audrey, Gibard, Clémentine, Gaulier, Christelle, Nauton, Lionel, Thery, Vincent, El-Ghozzi, Malika, Avignant, Daniel, Cisnetti, Federico, Gautier, Arnaud   +8 more
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1‐(Azidomethyl)benzotriazole and ‐5‐phenyl‐1,2,3,4‐tetrazole as 1, 3‐dipolar cycloaddition components

Journal of Heterocyclic Chemistry, 1996
Abstract1‐(Azidomethyl)benzotriazole reacts with alkynes to give mixtures of isomeric 1,2,3‐triazoles, whereas the interactions of 1‐(azidomethyl)benzotriazole and ‐5‐phenyl‐1,2,3,4‐tetrazole with alkenes proceed regioselectively to form 1,2,3‐triazolines and/or aziridines and enamines in good yields.
Alan R. Katritzky, Clara N. Fali, Irina V. Shcherbakova, Sergei V. Verin   +3 more
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Intramolecular 1, 3-dipolar cycloadditions of the new sydnone derivatives

2005
Inter- and intramolecular photochemical [2+2] cycloaddition reactions of o-substituted divinylbenzene with furan and pyrrole rings give various hetero polycyclic compounds (1). The photochemical reaction of the sydnone analogue 1 did not undergo intramolecular cycloaddition (2), but in the presence of acrolein, the intermolecular 1, 3-dipolar ...
Butković, Kristina, Marinić, Željko, Šindler-Kulyk, Marija   +2 more
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A THEORETICAL STUDY ON THE MECHANISM OF 2:1 1, 3 DIPOLAR CYCLOADDITION REACTIONS

Journal of Theoretical and Computational Chemistry, 2007
The reactions between nitrile oxides and alkenes are of considerable interest in organic synthesis as the resulting heterocycles are versatile intermediates for the synthesis of natural products and biologically active compounds. In this paper, we design a series of reactions of phosphonyl nitrile oxides with acrylonnitrile, which can give 2:1 ...
Wang, J. F., Wei, D. Q., Wang, C. F., Ye, Y., Li, Y. X., Luo, Y., Wang, W. W., Liu, L. Z., Zhao, Y. F.   +8 more
openaire   +1 more source