Results 1 to 10 of about 5,265 (218)

Ring-Opening Fluorination of Isoxazoles

Organic Letters, 2022
A ring-opening fluorination of isoxazoles has been developed. Upon treatment of isoxazoles with an electrophilic fluorinating agent (Selectfluor), fluorination followed by deprotonation leads to tertiary fluorinated carbonyl compounds.
Masaaki Komatsuda (5482064), Hiroki Kondo, Masaaki Komatsuda, Ayane Suto (12462506), Hugo Ohki (12462503), Junichiro Yamaguchi, Junichiro Yamaguchi (1685833), Ayane Suto, Hugo Ohki, Hiroki Kondo (155338)   +9 more
core   +4 more sources

Isoxazole/Isoxazoline Skeleton in the Structural Modification of Natural Products: A Review

Pharmaceuticals, 2023
Isoxazoles and isoxazolines are five-membered heterocyclic molecules containing nitrogen and oxygen. Isoxazole and isoxazoline are the most popular heterocyclic compounds for developing novel drug candidates.
Xiyue Wang, Qingyun Hu, Hui Tang, Xinhui Pan   +3 more
doaj   +1 more source

Synthesis of 3,4,5-trisubstituted isoxazoles in water via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides

Beilstein Journal of Organic Chemistry, 2022
Herein we report a method for the synthesis of 3,4,5-trisubstituted isoxazoles in water under mild basic conditions at room temperature via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides.
Md Imran Hossain, Md Imdadul H. Khan, Seong Jong Kim, Hoang V. Le   +3 more
doaj   +1 more source

Design, Synthesis, and Biological Assessment of Novel Vanillin-Isoxazole Derivatives as Positive Allosteric Modulators of α7 Nicotinic Acetylcholine Receptor

Chemistry Proceedings, 2023
The homomeric α7 nicotinic acetylcholine receptor (α7 nAChR) is a cation-permeable pentameric ligand-gated channel present in the nervous system and non-neuronal cells.
Santiago Stabile, Juan Facundo Chrestia, Gabriel Radivoy, Cecilia Bouzat   +3 more
doaj   +1 more source

Mechanochemical Desymmetrization of Unbiased Bis- and Tris-alkynes to Access 3,5-Isoxazoles-Alkyne Adducts and Unsymmetrical Bis-3,5-isoxazoles

, 2022
A mechanochemical desymmetrization of symmetrical bis- and tris-alkynes via a controlled 1,3-dipolar cycloaddition reaction with nitrile oxide dipoles has been developed.
Irini , Trakakis, Rafael A., Hernandez R., Jean-Louis , Do, Tomislav , Friščić, Pat , Forgione, Louis A., Cuccia   +5 more
core   +1 more source

MnVI-NP–Catalyzed Generation of Nitrile Oxides: Easy Access to Isoxazolines and Isoxazoles via Stereoselective 1,3-Dipolar Cyclo­addition Reactions

SynOpen, 2022
The versatility and effectiveness of MnVI-NPs as a catalyst is examined for the generation of nitrile oxides from aldoximes and subsequent 1,3-dipolar cycloaddition reactions.
Yasmin Saima, Saikat Khamarui
doaj   +1 more source

Trifluoromethylated Flavonoid-Based Isoxazoles as Antidiabetic and Anti-Obesity Agents: Synthesis, In Vitro α-Amylase Inhibitory Activity, Molecular Docking and Structure–Activity Relationship Analysis

Molecules, 2021
Diabetes mellitus is a major health problem globally. The management of carbohydrate digestion provides an alternative treatment. Flavonoids constitute the largest group of polyphenolic compounds, produced by plants widely consumed as food and/or used ...
Faisal K. Algethami, Ilyes Saidi, Hani Nasser Abdelhamid, Mohamed R. Elamin, Babiker Y. Abdulkhair, Amani Chrouda, Hichem Ben Jannet   +6 more
doaj   +1 more source

[3 + 2] Cycloaddition reactions of nitrile oxides generated in situ from aldoximes with alkenes and alkynes under ball-milling conditions

Green Chemistry Letters and Reviews, 2022
A convenient and efficient [3 + 2] cycloaddition reaction of alkenes and alkynes with the in situ generated nitrile oxides from aldoximes in the presence of NaCl, Oxone and Na2CO3 has been developed to afford a series of isoxazoles and isoxazolines at ...
Run-Kai Fang, Zheng-Chun Yin, Jun-Shen Chen, Guan-Wu Wang   +3 more
doaj   +1 more source

Facile Synthesis of 2-Dimethylamino-Δ-1-Azirine Derivatives by Thermal or Photo-Isomerization of Isoxazoles [1]

CHIMIA, 1976
3,5-Bisdimethylamino-isoxazoles II are obtained easily from 1,3-dichloro-trimethinecyanine I and a water solution of hydroxylamine. Besides precedented photo-isomerization of 4-substituted isoxazoles IIb,c to azirines IIIb,c near quantitative thermal ...
G.J. de Voghel, T.L. Eggerichs, Brigitte Clamot, H.G. Viehe   +3 more
doaj   +1 more source

Synthesis of 3,4,5-Trisubstituted Isoxazoles in Water via a [3+2]-Cycloaddition of Nitrile Oxides and 1,3-Diketones, β-Ketoesters, or β-Ketoamides: Base-mediated and Keto-enol-controlled Mechanism

, 2021
A selective [3+2]-cycloaddition reaction of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides in water without the need of a metal catalyst is described.
Seong Jong, Kim, Md Imdadul H., Khan, Hoang V., Le, Md Imran, Hossain   +3 more
core   +1 more source