Synthesis of Isoxazolines and Isoxazoles via Metal-Free Desulfitative Cyclization
作者:Qiu Sun、Ling He、Jiaxin Cheng、Ze Yang、Yuansheng Li、Yulan Xi
DOI:10.1055/s-0037-1609480
日期:2018.6
bonds/construction of C–O bonds/elimination of SO2/C–N bond formation is achieved in sequence in the reaction system. A novel, one-pot reaction for the synthesis of isoxazolines and isoxazoles is developed via a cascade process under metal-free conditions. The approach involves the formation of intramolecular C–N and C–O bonds and intermolecular C–C bonds from aromatic alkenes or alkynes and N-hydroxysulfonamides
Hypoiodite mediated synthesis of isoxazolines from aldoximes and alkenes using catalytic KI and Oxone as the terminal oxidant
作者:Akira Yoshimura、Chenjie Zhu、Kyle R. Middleton、Anthony D. Todora、Brent J. Kastern、Andrey V. Maskaev、Viktor V. Zhdankin
DOI:10.1039/c3cc41164h
日期:——
Isoxazolines can be efficiently synthesized in good yields via a hypoiodite mediated catalytic oxidative cyclization of aldoximes and alkenes. This reaction involves active iodine species generated in situ from catalytic amounts of KI and Oxone.
Hypervalent Iodine Catalyzed Generation of Nitrile Oxides from Oximes and their Cycloaddition with Alkenes or Alkynes
作者:Akira Yoshimura、Kyle R. Middleton、Anthony D. Todora、Brent J. Kastern、Steven R. Koski、Andrey V. Maskaev、Viktor V. Zhdankin
DOI:10.1021/ol401815n
日期:2013.8.2
Hypervalentiodinecatalyzedoxidation of aldoximes using oxone as a terminal oxidant generates nitrile oxides, which react with alkenes and alkynes to give the corresponding isoxazolines and isoxazoles in moderate to good yields. This reaction involves active hypervalentiodinespecies formed in situ from catalytic iodoarene and oxone in the presence of hexafluoroisopropanol in aqueous methanol solution
Iron(<scp>iii</scp>)-catalyzed selective N–O bond cleavage to prepare tetrasubstituted pyridines and 3,5-disubstituted isoxazolines from <i>N</i>-vinyl-α,β-unsaturated ketonitrones
作者:Chun-Hua Chen、Qing-Yan Wu、Cui Wei、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1039/c8gc00630j
日期:——
An iron(III)-catalyst controlled cyclization and selective N–O bondcleavage of N-vinyl-α,β-unsaturated nitrones has been achieved under mild conditions to access tetrasubstituted pyridines and 3,5-disubstituted isoxazolines in moderate to good yields. The tetrasubstituted pyridines were afforded with FeCl3 as a catalyst while using FeCl3·6H2O combined with 1,10-phenanthroline delivered isoxazolines