[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...
One-Pot Synthesis of Isoxazolines from Aldehydes Catalyzed by Iodobenzene
作者:Jie Yan、Liuquan Han、Bijun Zhang、Changbin Xiang
DOI:10.1055/s-0033-1340464
日期:——
finally, a 1,3-dipolarcycloaddition between the nitrileoxides and alkenes occurs to provide the isoxazolines in moderate to good yields. A convenient one-pot, three-step procedure for the synthesis of isoxazolines starting from aldehydes has been developed involving catalytic cycloaddition between nitrileoxides and alkenes, in which iodobenzene is used as the catalyst for the in situgeneration of a hypervalent
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
Solid-Phase Synthesis of Pyrazolines and Isoxazolines with Sodium Benzenesulfinate as a Traceless Linker
作者:Yu Chen、Yulin Lam、Yee-Hing Lai
DOI:10.1021/ol0340888
日期:2003.4.1
text] The preparation of pyrazoline and isoxazoline derivatives with tracelesssolid-phase sulfone linker strategy is described. Key steps involved in the solid-phase synthetic procedure include (i) sulfinate S-alkylation, (ii) sulfone anion alkylation, (iii) gamma-hydroxy sulfone --> gamma-ketosulfone oxidation, and (iv) traceless product release via elimination-cyclization. A library of 12 pyrazolines