[2 + 2 + 1] Heteroannulation of Alkenes with Enynyl Benziodoxolones and Silver Nitrite Involving C≡C bond Oxidative Cleavage: Entry to 3-Aryl-Δ<sup>2</sup>-isoxazolines
作者:Cheng-Yong Wang、Fan Teng、Yang Li、Jin-Heng Li
DOI:10.1021/acs.orglett.0c01285
日期:2020.6.5
A copper-catalyzed [2 + 2 + 1] heteroannulation of alkenes with enynyl benziodoxolones and AgNO2 involving oxidative cleavage of the C≡C bond promoted by cooperative Zn(OTf)2, KOAc, and 4 Å MS for producing 3-aryl Δ2-isoxazolines is reported. Mechanistic studies indicate that AgNO2 serves as the N/O two-atom unit source, enabling the formation of three bonds through NO2 addition across the C≡C bond
Visible-light-mediated generation of nitrile oxides for the photoredox synthesis of isoxazolines and isoxazoles
作者:Thomas D. Svejstrup、Wojciech Zawodny、James J. Douglas、Damon Bidgeli、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1039/c6cc06029c
日期:——
Visible-light photoredox catalysis enables the synthesis of biologically relevant isoxazolines and isoxazoles from hydroxyimino acids. The process shows broad functional group compatibility and mechanisitic and computational studies support a visible-light-mediated...
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