General Platform for the Conversion of Isoxazol-5-ones to 3,5-Disubstituted Isoxazoles via Nucleophilic Substitutions and Palladium Catalyzed Cross-Coupling Strategies
作者:Alessandra A. G. Fernandes、Amanda F. da Silva、Celso Y. Okada、Vitor Suzukawa、Rodrigo A. Cormanich、Igor D. Jurberg
DOI:10.1002/ejoc.201900187
日期:2019.5.26
5‐disubstituted isoxazoles has been developed via a two‐step strategy. The first step leads to the formation of 5‐(pseudo)halogenated isoxazoles, while in the second, a variety of heteroalkyl‐, heteroaryl‐, alkyl‐, alkenyl‐, alkynyl‐ and aryl‐chains can be installed via nucleophilicsubstitutions or palladium catalyzed cross‐coupling reactions.
Reactions of benzoylheteroaroylmethanes with hydroxylamine hydrochloride
作者:Alistair D. Mitchell、Derek C. Nonhebel
DOI:10.1016/0040-4020(76)87030-5
日期:1976.1
predominantly 5-(2-furyl)-3-phenylisoxazole and not as reported in the literature 3-(2-furyl)-5-phenylisoxazole. Benzoyl-2-thenoylmethane and benzoylpicolinoylmethane afforded 3-phenyl-5-(2-thienyl)isoxazole and 5-phenyl-3-(2-pyridyl)isoxazole respectively.
Preparation of 3,5-Disubstituted Pyrazoles and Isoxazoles from Terminal Alkynes, Aldehydes, Hydrazines, and Hydroxylamine
作者:Ryo Harigae、Katsuhiko Moriyama、Hideo Togo
DOI:10.1021/jo4027116
日期:2014.3.7
provided the corresponding 3,5-disubstituted pyrazoles or isoxazoles in good yields with high regioselectivity, through the formations of propargyl secondary alkoxides and α-alkynyl ketones. The present reactions are one-pot preparation of 3,5-disubstituted pyrazoles from terminal alkynes, aldehydes, molecular iodine, and hydrazines, and 3,5-disubstitutedisoxazolesfrom terminal alkynes, aldehydes
Synthesis of isoxazoles via cyclization of β-fluoro enones with sodium azide
作者:Liangkui Li、Shiqing Huang、Kuantao Mao、Leiyang Lv、Zhiping Li
DOI:10.1016/j.tetlet.2021.153052
日期:2021.5
A practical method for the synthesis of 3,5-disubstituted isoxazoles via cyclization of β-fluoro enones with sodium azide was disclosed. Density functional theory (DFT) calculation indicated that both (1) the azirine formation followed by intramolecular rearrangement and (2) direct enolate O-attack via 5-exo-trig cyclization of vinyl azide were possible for the isoxazole formation.