Acylation of Nitronates: [3,3]-Sigmatropic Rearrangement of <i>in Situ</i> Generated <i>N</i>-Acyloxy,<i>N</i>-oxyenamines
作者:Aleksandr O. Kokuev、Yulia A. Antonova、Valentin S. Dorokhov、Ivan S. Golovanov、Yulia V. Nelyubina、Andrey A. Tabolin、Alexey Yu. Sukhorukov、Sema L. Ioffe
DOI:10.1021/acs.joc.8b01652
日期:2018.9.21
affords α-acyloxyoxime derivatives via an umpolung functionalization of the α-position. This transformation involves generation of hitherto unknown N-acyloxy,N-oxyenamines and their fast [3,3]-sigmatropicrearrangement driven by the cleavage of the weak N–O bond. The reaction has a broad scope, and it is regioselective in the case of nitronates possessing nonsymmetrically substituted α-positions. Application
Abstract A series of 2-hydroxyaryl ketoximes were converted to the corresponding 1,2-benzisoxazole 2-oxides by treatment with iodobenzene diacetate (in acetic acid or methanol) or N-chlorosuccinimide in water. Both methods gave moderate to excellent yields for a variety of substituted oximes under mild conditions within short reaction times. The latter method has the advantages of an aqueous solvent
Sodium Perborate: A Facile Synthesis of 1,2-Benzisoxazole 2-Oxides
作者:Vidyadhar K. Jadhav、Anjali P. Deshmukh、Prakash P. Wadagaonkar、Manikrao M. Salunkhe
DOI:10.1080/00397910008087181
日期:2000.4
Abstract An efficient and convenient methodology has been developed for the conversion of 2-hydroxy phenyl ketoxime to 1,2-benzisoxazole 2-oxide with sodiumperborate (SPB) in glacial acetic acid under mild reaction conditions. Interestingly when the reaction was carried out under reflux condition deoximation was observed in quantitative yield.
Synthesis of Isoxazoline <i>N</i>-Oxides via [Hydroxy(tosyloxy)iodo]benzene (HTIB)-Mediated Oxidative N−O Coupling
作者:Mustafa J. Raihan、Veerababurao Kavala、Pateliya Mujjamil Habib、Qiao-Zhi Guan、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1021/jo1018393
日期:2011.1.21
An HTIB mediated oxidativeN−Ocoupling strategy for the synthesis of some isoxazoline N-oxide derivatives from β-hydroxyketoximes is described, along with a comparative study of the efficiency of N−Ocoupling in two different solvents. A plausible mechanism for the conversion is proposed.