Results 191 to 200 of about 17,972 (231)

Construction of nine-membered N,N,O-heterocycles via Pd-catalyzed [6+3] dipolar cycloaddition

Chemical Communications, 2022
A new approach for the synthesis of 9-membered N,N,O-heterocycles by Pd-catalyzed [6+3] dipolar cycloaddition of N-iminoisoquinolinium ylides and 2-vinyl oxetanes has been developed.
Hongling Xie, Zhenkun Yang, Luning Tang, Zhengyu Han, Jianwei Sun, Hai Huang   +5 more
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Theory of the Formation and Decomposition of N‐Heterocyclic Aminooxycarbenes through Metal‐Assisted [2+3]‐Dipolar Cycloaddition/Retro‐Cycloaddition

Chemistry – A European Journal, 2013
AbstractThe theoretical background of the formation of N‐heterocyclic oxadiazoline carbenes through a metal‐assisted [2+3]‐dipolar cycloaddition (CA) reaction of nitrones R1CHN(R2)O to isocyanides CNR and the decomposition of these carbenes to imines R1CHNR2 and isocyanates OCNR is discussed.
Alexander S, Novikov, Maxim L, Kuznetsov, Armando J L, Pombeiro   +2 more
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ChemInform Abstract: Trimethylsilyl Triflate‐Promoted (2 + 3)Dipolar Cycloaddition of Nitrones with Allyltrimethylsilane.

ChemInform, 1993
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
D. D. DHAVALE, C. TROMBINI
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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
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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
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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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