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
Benzisoxazole 2-oxides as novel UV absorbers and photooxidation inhibitors
作者:Martin George Kociolek、Jerry S. Casbohm
DOI:10.1002/poc.3161
日期:2013.10
Compounds with strong absorptions in the ultraviolet (UV) region of the spectrum, particularly the UVA and UVB, have seen much interest as UV screeners or absorbers in a wide variety of commercial products. A series of benzisoxazole 2‐oxides have been synthesized and characterized by UV–vis spectroscopy. A number of derivatives have been shown to posses moderate to strong molar absorption coefficients
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.