Results 201 to 210 of about 25,619 (230)

Approach to regiochemistry using local softness in 1,3-dipolar cycloadditions

Journal of Computational Chemistry, 1998
The principle of hard and soft acids and bases is applied in the local sense to rationalize the regiochemistry in the cycloaddition reactions of a few typical 1,3-dipoles, in particular those with phosphorus-containing dipolarophiles. Local softnesses are calculated using density functional theory.
Asit K. Chandra, Minh Tho Nguyen
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Gram Scale Synthesis of (±)-Gregatin A via 1, 3-dipolar Cycloaddition Strategy

Here, we present a 6-step gram-scale synthesis of (±)-gregatin A, a fungal polyketide characterized by an alkylated furanone core origi-nally isolated from Cephalosporium gregatum. The synthetic route features an intermolecular 1,3-dipolar cycloaddition, a Mo-mediated disconnection of isoxazole skeleton, and an acid-mediated desilylation/enamine ...
Yiming Ding, Xiaoli Zhao, Chunlei Qu, Xianwen Long, Yaqiu Zhao, Xiao-Dong Yang, Haixiang Shen, Jun Deng   +7 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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2 + 3 Dipolar cycloadditions of a monomeric thioaldehyde

The Journal of Organic Chemistry, 1986
E. Vedejs, R. G. Wilde
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Novel 1, 3-Dipolar Cycloadditions of Cyclobutene Diester Epoxides to Polycyclic Aromatic Hydrocarbons

2003
This paper announces the results of certain 1, 3-dipolar cycloadditions to polycyclic aromatic hydrocarbons (PAHs). The 1, 3-dipoles generated from cyclobutene diester epoxides thermally reacted with PAHs to give cycloadducts. This reaction demonstrated the remarkable ability of these 1, 3-dipoles to disrupt an aromatic system by adding across specific
Margetić, Davor, Butler, Douglas, N., Warrener, Ronald, N.   +2 more
openaire   +3 more sources

1,3‐Dipolar Cycloaddition between Dehydroalanines and C,N‐Cyclic Azomethine Imines: Application to Late‐Stage Peptide Modification

Angewandte Chemie - International Edition, 2021
Wangsheng Sun, Liang Hong, Rui Wang
exaly  

Synthesis of Isoxazoles via [2+3]-Dipolar Cycloaddition Using Alkyne Surrogates

Synfacts, 2007
A. II, S. Dadiboyena, J. Xu
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Via [2+3]-Dipolar Cycloadditions

2002
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Organocatalytic Diastereo‐ and Enantioselective 1,3‐Dipolar Cycloaddition of Azlactones and Methyleneindolinones

Angewandte Chemie - International Edition, 2013
Wangsheng Sun, Chongyang Wu, Liang Hong   +2 more
exaly  

[2+3]-Dipolar Cycloaddition

2006
openaire   +1 more source