[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...
Nitrosonium hexachlorostannate: synthesis, crystal structure, and nitrosating activity in the reactions with arylcyclopropanes
作者:I. V. Morozov、O. B. Bondarenko、E. V. Karpova、A. S. Pryadchenko、Yu. M. Korenev、S. I. Troyanov、N. V. Zyk
DOI:10.1007/s11172-010-0334-6
日期:2010.10
data, the structure of (NO)2[SnCl6] consists of cations NO+ and octahedral anions [SnCl6]2− arranged as ions in antifluorite. Isoxazolines were synthesized by the reactions of (NO)2[SnCl6] with arylcyclopropanes containing donor substituents in the aromatic ring.
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
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