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.
Gold(III)-Catalyzed Synthesis of Isoxazoles by Cycloisomerization of α,β-Acetylenic Oximes
作者:P. Perumal、C. Praveen、A. Kalyanasundaram
DOI:10.1055/s-0029-1219342
日期:2010.3
β-acetylenic oximes leading to substituted isoxazoles was achieved using AuCl 3 as catalyst, under moderate reaction conditions. The reaction can be applied to various acetylenic oximes and gives good to excellent yields. The methodology is amenable for the selective synthesis of 3-substituted, 5-substituted or 3,5-disubstituted isoxazoles by simply altering the substituents on the acetylenic oximes.
Trichloroisocyanuric acid mediated one-pot synthesis of 3,5-diarylisoxazoles from <i>α,β</i>-unsaturated ketones
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1080/00397911.2019.1590848
日期:2019.4.18
Abstract A facile one-pot synthesis of 3,5-diarylisoxazoles from α,β-unsaturatedketones and hydroxylamine hydrochloride is reported. The reaction is efficiently promoted by trichloroisocyanuric acid (TCCA) to afford the desired products, mostly in high yields and in relatively short time. The mild nature of the synthesis and short reaction time are notable advantages of the developed protocol. This
A convenient one-pot synthesis of 3,5-diarylisoxazoles via oxidative cyclisation using catalytic CuBr2 and oxone
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1016/j.tetlet.2019.03.044
日期:2019.4
A facile one-pot synthesis of 3,5-diarylisoxazoles from α,β-unsaturated ketones and hydroxylamine hydrochloride is reported. The reaction is efficiently promoted by catalytic CuBr2 and Oxone to afford the desired products mostly in high yields and in relatively short time. The mild nature of the synthesis and short reaction time are notable advantages of the developed protocol. This protocol is effective
Reactions of β-diketones with hydroxylamine hydrochloride; synthesis of 3,5-disubstituted isoxazoles
作者:J. Larkin、M. G. Murray、D. C. Nonhebel
DOI:10.1039/j39700000947
日期:——
Substituted dibenzoylmethanes react with hydroxylaminehydrochloride to give 3-aryl-5-phenylisoxazoles and/or 5-aryl-3-phenylisoxazoles depending on the nature of the substituent in the diketone. Some structures previously assigned to isoxazoles from these reactions have been shown to be incorrect.